Blender Pro Tips
How Professionals Create 3D Models
By Arijan Belec
Copyright © 2023 Arijan Belec
All rights reserved. No part of this book may be reproduced in any form without permission
from the author.
To request permission, contact arijan@blenderdaddy.com
Contents
Introduction
Understanding Topology
Cutting Holes with the Boolean Modifier
Cutting Holes the Right Way
Mastering Topology
Modeling on Curved Surfaces
Attaching Objects to Surfaces
Simplifying Modeling with Loop Tools
Summary of Terms
The Author
Introduction
This short eBook will teach you how to make professional quality models by showing you
some simple but game-changing tricks. It will change the way you understand 3D modelling
and help you advance your skills by breaking the beginner mindset. By understanding what
defines a high-quality 3D model, you will adopt an improved workflow which will make you
unable to produce low-quality models.
You will learn to use topology to your advantage to create good 3D models, by understanding
the difference between good and bad topology, and learning how to do it correctly through
multiple simple exercises.
You will receive a download link for the Panzer V tank which you can see below.
We will then explore must-know 3D modelling techniques which you will be able to apply in
virtually any 3D modelling project ever to ensure the highest quality.
At the end, we will dive into the LoopTools add-on, arguably one of the most useful
modelling toolkits available in Blender and learn how to use this add-on to save time and
energy and create things which would otherwise be impossibly complicated.
All information is presented in the form of step-by-step instructions accompanied by images
and brief theoretical explanations. Basic tool shortcuts are explained the first time they are
used. All definitions, concepts, tools, modifiers, and shortcuts are summarized at the end of
this eBook.
Figure 0 – Panzer V model
Understanding Topology
The absolute best way to level up your modelling skills is to understand Topology. By
practicing good topology, your models will have a much higher overall quality. We are going
to discuss what topology means, why it is important and how we can get good at working
with it.
Definition
Topology is the arrangement and flow of Polygons on the surface of a mesh. Polygons are
shapes defined by Vertices, and the Edges which connect the vertices. The surface between
the edges and vertices is called the Face. In simple terms, polygons are just 2D shapes. Think
of a triangle, rectangle, pentagon, hexagon and so on (Figure 1).
Figure 1 – 4 examples of different polygons. Notice that they are not necessarily
equilateral, they just have a different number of edges.
In polygon-based 3D modelling (as opposed to CAD modelling), every object is made of a
combination of polygons. Ideally, we want all our polygons to be 4-sided to ensure the
highest quality. 4-sided polygons are known as Quads. Triangles are acceptable too, but we
will later learn why using only rectangles is preferable. 3-sided polygons are known as Tris.
Figure 2 – Blender’s iconic monkey model consists of only quads
and tris, as a good quality model should.
We can now conclude that one way of identifying good topology is the exclusive usage of
primarily quads and, if necessary, tris. We can also assume that, generally, inspecting the
topology of a 3D model is a good way to assess its quality, and we will now learn why.
Comparing Good and Bad Topology
Let’s discuss some problems that can come up because of bad topology. Figure 3 shows two
cubes with circular holes in their top faces. The left object has bad topology, and the right
object has great topology. The left object has N-gons, which are polygons consisting of n
edges, n being any number greater than 4. The right object consists of only quads.
Figure 3 – Good topology vs bad topology.
We understand now that the object on the left has bad topology, but let’s look at why this can
be a problem.
Figure 4 shows the same two objects with a Subdivision Surface modifier. The object on the
right looks exactly as we would want it to look when subdivided, but the object on the left
turns into a complete mess. This massive difference in the result is caused by the object’s
topology.
Figure 4 – Subdivided Objects have a dramatically different result caused
by topology.
Another example of what can go wrong because of bad topology is the tendency of Shading
Artifacts to appear when smooth shading is activated. Shading artifacts are visible
imperfections in the shading of an object, which clearly should not be there.
Figure 5 – Difference in shading caused by the topology of an object
N-gons and bad topology also cause difficulties with modelling by disabling some tools from
working correctly. For example, the loop cut tool (activated with Ctrl + R) will not work as it
should because blender does not know how to apply the tool correctly. This is visible in
Figure 6, where the loop cut appears as only 2 points on an edge on the right object.
This can also happen when triangles are used instead of quads, which Is why it is generally
better to avoid them, though they are not as bad as n-gons.
Figure 6 – Loop cut tool on good and bad topology
We now learned about 3 kinds of problems can be caused by bad topology and why it is
important to use good topology. Next, let’s learn to create both so we can avoid the former
and focus on the latter.
Cutting Holes with the Boolean Modifier
We will now learn how to create the objects discussed previously, in Figure 3. We will first
create the object with bad topology, and then with good topology. That way, we will fully
understand both situations.
First, let’s follow a few steps and cut a hole into a cube the easy but wrong way, i.e. with a
Boolean Modifier. This will give us the result visible on the left side of Figure 3. This is not
the recommended method, but it can be useful in some cases.
1. Add a Cube and a Cylinder from the Add menu (Shift + A). Make sure that you are
in Object Mode (Toggle with Tab).
Figure 7 – Adding a cylinder
2. Scale the cylinder down with S and move it on top of the cube.
Make sure that the cylinder still intersects with the cube. The intersection zone is
going to be the hole.
Figure 8 – Moving the cylinder
3. Find the Blender Properties tab on the right side of the screen.
Figure 9 – Modifier Properties
4. Add the Boolean Modifier from the Add Modifier menu.
Figure 10 – Boolean Modifier
5. Set the Boolean to Difference and the object to Cylinder. You can rename objects by
selecting them and pressing F2.
Figure 11 – Boolean Settings
6. Apply the Boolean modifier. A modifier can also be applied by pressing Shift + A
when hovering over it with your pointer.
Figure 12 – Applying the Boolean Modifier
Applying the modifier will create a great looking cylindrical hole in the cube.
Figure 13 – A hole made with a Boolean
modifier
Although the object looks good in object mode, if we inspect it in Edit Mode, we can see that
the topology of this wrong, just like in the previous example.
Figure 14 – Bad topology caused by a Boolean modifier.
Now, let’s explore a better way to achieve the same goal.
Cutting Holes the Right Way
We figured out that the Boolean modifier gets the job of cutting a hole done, but it ruins the
topology. Unless you’re trying to create an example of bad topology, you’re probably going
to need a better way to do this. Let’s learn how to make a hole in this cube the right way in a
few steps.
1. Create a new cube and subdivide it in edit mode. To subdivide the mesh, find the
Edge menu in the top left and click on Subdivide.
Pressing W will open the Edge Context menu, which also has the subdivide option.
Figure 15 – Subdivide tool
Subdividing turns every edge into 2 edges, and every face into 4 faces. Subdividing
twice will give us the result shown in Figure 16. This is what we need to create a
hole.
Figure 16 – A cube which has been subdivided twice will have
each original edge turned into 4 edges, and each original face
turned into 16 faces.
2. Select the entire top surface of the cube.
You can do this quickly by selecting a face in one corner first, then selecting the face
on the opposite corner while holding CTRL. Doing this will select the entire surface
bounded by those two faces.
Figure 17 - Selecting a surface
3. Press I and move the mouse pointer towards the center of the surface to Inset the
faces.
Make sure not to inset too far, because that will cause face overlapping.
Figure 18 – Insetting selected faces
We need to activate an Add-on for this technique to work. Add-ons are tools and kits which
are not available by default, but they can be added to Blender quickly through a simple menu.
4. Open the Edit menu in the top left and click on Preferences.
Figure 19 – Preferences
5. In the preferences menu, open the Add-ons section and search LoopTools.
When you check the box next to the add-on, it becomes active.
Figure 20 – Activating the LoopTools add-on
6. With the same faces still selected, press W and open the LoopTools menu, then select
Circle.
Figure 21 – LoopTools circle
Now, the selected faces should be turned into a circle, like in Figure 22. Now is a
good time to rescale this circle with S and set the right size for the hole which we will
create in the next move.
We will study the LoopTools addon more in-depth later.
Figure 22 – Faces in a circle
7. We can now extrude the face downwards with E to create a hole.
Notice how the circle is formed from the edges around the top surface of the cube.
These edges were created by subdividing the original edges. The more we subdivide,
the more edges we get, the smoother the circle becomes.
Figure 23 – Extruding a hole from the circle
We now successfully created a circular hole with good topology. Let’s look at an example of
how we can apply this technique to a real model, instead of just a simple cube.
Practicing on a Real Model
I will give you with a cool Panzer V tank model for this exercise. This model was made on
three separate livestreams on my YouTube Channel. You can download it on here:
https://drive.google.com/file/d/1JFMoLjcaXDjhr_TknbXkYdaMLiNcmzPV/view?usp=shari
ng
Figure 24 shows some exhaust vents on the rear the Panzer tank. We have the vents to cover
the holes, but we don’t have any actual holes. Below the vents is just another surface.
Figure 24 – Exhaust vents on a Panzer tank
We are now going to apply the technique that we learned to create holes underneath these
vents.
1. Lift the vents and panels to reveal the surface underneath.
Figure 25 – Revealing the working surface by lifting up the panels
In edit mode, we can see that there are currently some large faces underneath the
vents. We cannot just extrude these downwards because we need to set the right shape
for the holes first.
Figure 26 – Faces below the vents are too large to create the holes correctly
By inspecting the model from top view (NUM7), we can see that we need three holes
underneath each panel. We need two rectangular holes for the front and back vents,
and one circular hole between them for the circular vent.
Figure 27 – The shapes we need to create on the surface before extruding the holes
2. Separate the surface below into 3 segments using loop cuts.
This allows us to work separately on each hole.
Figure 28 – Separating the faces to create a more convenient workspace
3. Inset the faces directly below the 2 square vents. This gives us new faces which we
will be able to extrude downwards once we align the shape with the vents.
Figure 29 – Insetting the faces below the vents to allow extrusion
In top wireframe view, we can see that the inset faces are much larger than the shapes
of the vents. We must now adjust the shapes of the faces so that they are slightly
smaller than the frames of the vents.
Figure 30 – The inset faces are currently not aligned with the vent shapes
4. Adjust the shapes of the faces by moving the edges and aligning them with the frame.
Figure 31 – Adjusting the edges of the faces to align them with the frame
5. Also align the other edges with the frames of the vents.
Figure 32 – Aligning the remaining edges with the frame
6. Extrude the rectangular shapes downwards to create the first holes.
Figure 33 – Extruding the first holes
The rectangular holes on the sides are now finished.
Next, we need to create a circular hole below the circular vent. We will repeat the same
process we followed earlier, which we used to create the hole in the cube. First, we need
some more edges to create a circle.
1. Add 3 loop cuts to the section where the circular hole will be created.
Figure 34 – Adding loop cuts to create new edges
2. Inset the faces in the middle section.
Figure 35 – Insetting faces to allow the creation of a circle
3. Use loop tools (accessed with W) to turn the selected faces into a circle.
Notice how we adjusted the shape of the selection to make it look more like a square.
Figure 36 – Using LoopTools to turn the selected faces into a circle
4. Adjust the size and placement of the circle so it fits the frame of the vent.
Figure 37 – Adjusting the size of the new circle
5. Extrude the circle downwards to create the hole for the vent.
Figure 38 – Extruding the circle downwards and creating the hole
The right side of the tank now has holes below the vents, while the left side does not. The
difference is visible in Figure 39
Figure 39 – Two sides of the tank, one with holes below the vents and one without.
We got enough practice now to comfortably cut holes in flat surfaces. Later on, we will learn
some techniques to do this on curved surfaces as well. Next, let’s practice topology.
Mastering Topology
I now have a challenge for you. Can you model the object from Figure 40, with perfect
topology? If the answer is yes, then you can close this document and relax. If the answer is
no, then we have work to do, because this is a very important thing to know.
Figure 40 – Bridge Topology
Here is an example of when a bridge like this is important. Look at the center console in the
lower portion of Figure 41. The object is all one piece, and the chrome bridge connects the
front and the back of the frame and acts as a bridge over the hole beneath. It is essentially the
same shape as the one depicted previously, in Figure 40.
Figure 41 – Ferrari 812 Superfast interior render (by Arijan)
Let’s learn how to create this kind of bridge, with perfect topology, in a couple of steps.
1. Repeat the steps we took earlier to create a cube with a circle on top.
Figure 42 – Cube with a circle
2. Select 2 sets of 2 edge on opposite sides of the circle. Make sure that they are exactly
opposite.
Figure 43 – Selecting opposite edges
3. Press W in edit mode and select Bridge Edge Loops. To do this correctly, ensure that
you are in Edge Select Mode by pressing 2.
Figure 44 – Bridging edge loops
4. Add a few loop cuts with Ctrl + R and make them slightly narrower than the edges.
Figure 45 – Adding loop cuts to the bridge
5. Move the inner edges on the bridge slightly upwards, and the edges on the sides of the
cube slightly downwards.
This will make the top surface appear slightly bent and more natural.
Figure 46 – Adjusting Edges
6. Select the edge loops around the 2 holes on top and extrude them down. You can
select an entire edge loop with Alt + Right Mouse Click.
Figure 47 – Extruding Edge Loops
7. Select the two edge loops at the bottom of the bridge. We will add faces to connect
these edges by once again pressing W and selecting Bridge Edge Loops.
Also add a loop cut to the underside of the bridge.
Figure 48 – Bridging edge loops
8. Extrude the edge loop at the bottom once again and push it downwards.
Figure 49 – Extruding the bottom edge loop
9. With the bottom edge loop selected, open the Face menu, and select Grid Fill.
Figure 50 – Grid fill
This will fill the edge loop with clean topology. You can adjust the fill shape by
playing with the numbers in the Grid Fill menu which appears in the bottom-left
corner of the screen after grid filling.
Figure 51 – Adjusting the grid fill
10. Inset the surface which we grid-filled in step 9.
Figure 52 – Insetting the lower surface
11. Add a subdivision surface modifier to make the object look nicer.
Figure 53 – Adding a subdivision surface modifier
We now learned how to correctly cut holes in surfaces and create objects which connect
opposite ends of the hole. Next, we are going to learn how to model in or on curved surfaces,
so that we can create holes or attach items to a curved surface.
Modeling on Curved Surfaces
We will now learn how to model objects on curved surfaces so that we can attach shapes or
cut holes in any surface.
Let’s say we want to attach a cylinder to a sphere, such that the cylinder connects to the
surface of the sphere at an angle, as shown in Figure 54. Clean topology is a requirement.
Figure 54 – Cylinder attached to a sphere
We are now going to do an exercise to create this shape in a few more steps.
1. Add a cube with a subdivision surface modifier. 3 levels of subdivision are optimal
for our purpose. Make sure to apply the modifier.
Figure 55 – Subdivided cube
This isn’t a perfect sphere. Although it doesn’t matter for our exercise, you can turn it
into a perfect sphere by adding a Cast modifier.
2. In the cast modifier, set the Shape to Sphere and the Factor to 1.00. Apply the
modifier.
Figure 56 – Using a cast modifier to turn a cube into a sphere.
3. Select a face at which you want to create the cylinder. After selecting the face, press
Shift + NUM7 to align your view with the selected face.
Figure 57 – Aligning the 3D view with a face
4. Press Tab to switch to object mode and add a circle. Set the number of vertices to 12
and align the circle with your view.
Figure 58 – Aligning the circle with the view
5. Rotate the circle by 45 degrees.
Figure 59 – Rotating the circle
6. Select the circle, and in edit mode, fill it with F.
Then, in object mode, move the circle along its local Z axis by pressing G to grab, and
double-pressing Z to limit movement to the local Z axis. Slide it so it is almost exactly
on the surface of the sphere.
The local axes are set according to the object’s rotation in object mode. Since we
aligned the circle with our view after aligning our view with the face, the circle moves
along a line normal to the face on the circle.
Figure 60 – Moving the circle along the local Z axis
7. Add a Shrinkwrap modifier to the circle.
Figure 61 – Adding a shrinkwrap modifier
8. In the modifier menu, set the Wrap Method to Project and set the Target to the
sphere, which is currently named Cube because it was created from a cube.
Figure 62 – Shrinkwrap settings
9. Move the circle down on its local Z axis again, until it is completely glued to the
surface of the sphere.
Figure 63 – Moving the circle down
We can now join the two objects into one to make them easier to work with. Select the circle
first and the sphere second, then press CTRL + J in object mode. This will merge them into a
single object, so we can see the geometry of both objects simultaneously in edit mode.
Figure 64 – Joining two objects into one
We will now use this mesh to create a shape on the surface of the sphere. In the next few
steps, we will fuse the circle with the sphere seamlessly and extrude it into a cylinder.
1. Select the face in the middle of the circle and delete its vertices by pressing X or
Delete. This will create an empty space around the circle.
Figure 65 – Deleting vertices on the focused face
The gap around the circle is made up of exactly 12 vertices. Our circle also has 12
vertices, so we can connect these edge loops perfectly with quads. A larger circle will
require more faces deleted, and more vertices to connect correctly.
Figure 66 – Perfectly matching vertices
2. Bridge the edge loops of the circle and the gap around the circle.
Figure 67 – Bridging edge loops to connect the shapes
3. Extrude the circular face, either inwards or outwards.
Figure 68 – Extruding the circle from the sphere
4. Delete the face at the end and fill the edge loop with a grid, as we learned previously.
Figure 69 – Grid filling the cylinder
5. Add a subdivision surface modifier to the object.
Figure 70 – Adding a subdivision surface modifier to the object
6. In the Object menu, select Shade Smooth to make the object appear smoother.
Figure 71 – Smooth Shading
7. Add loop cuts to the top and bottom of the cylinder to fit the edges, with CTRL + R.
Figure 72 – Adding loop cuts to the cylinder
8. Inset the faces at the top of the cylinder to further improve the appearance of the
mesh.
Figure 73 – Insetting the faces at the top
We now have a cylinder perfectly welded to the surface of the sphere.
Figure 74 – Cylinder attached to a sphere
This technique works well for fixing shapes onto a surface Destructively, i.e. permanently
and in such a way that it cannot be undone without a considerable amount of work. In other
words, we cannot move this shape to another part of the sphere.
In the next section, we are going to learn how to attach shapes to objects in a more flexible,
Non-Destructive way. This will allow us to add high levels of details to our models.
Attaching Objects to Surfaces
We will now learn a way to glue objects to surfaces below them seamlessly without
permanently changing the shape of either the object or the surface.
Figure 75 shows the outcome that we are going for. There is no visible edge between the
hatch and the curved surface below it. Yet, this object can easily be moved around the surface
and placed anywhere while staying connected.
Figure 75 – Seamless attachment
Here is an example of how this might be useful when modeling. In Figure 76, the hatch is
attached to the top of a tank turret, which is curved. This technique will help us attach any
details to our models, like the other objects on this tank.
Figure 76 – Hatch attached to a tank turret
In the following steps, we will learn to prepare our models for easy attaching to other objects.
We can use the sphere which we created previously as the surface object.
1. Rename the object with F2 to something recognizable.
Figure 77 – Renaming the surface object
2. Add a flattened cylinder on top of the sphere.
You can reshape it to anything you like, just remember that the base should be kept a
simple circle for this exercise.
Figure 78 – Adding and reshaping a cylinder.
3. Select the face at the bottom of the shape and delete it by pressing X.
Figure 79 - Deleting the face at the bottom of the object
4. Select the remaining edge loop and snap the 3D cursor to it by pressing Shift + S and
selecting Cursor to Selected.
Figure 80 – Cursor to Selected
This will place the 3D cursor exactly in the middle of the circle, and it should look
like Figure 81.
Figure 81 – 3D cursor placed in the center of an edge loop
5. Enter object mode by pressing Tab and find the Object menu in the top left.
Open the Set Origin section and select Origin to 3D Cursor. The origin is the small
orange dot pointed out in Figure 82
Figure 82 – Setting the Origin to the 3D Cursor
The origin of an object determines where exactly the object is located. If we change
the location of the origin without moving the mesh in edit mode, the location of the
object will change but the mesh will stay in the same place.
Figure 83 – Origin at 3D Cursor
Likewise, if we tell blender to move this object to a specific place, the object will be
placed so that its origin is in that specific place.
For example, if we move our 3D cursor elsewhere (by clicking the left mouse button
anywhere) and snap the selected object to the 3D cursor, its origin will be exactly at
the 3D cursor, but the mesh will move too, as shown in Figure 84.
Figure 84 – Snapping an object to the 3D Cursor
6. Select the object and find the Constraint Properties menu on the left side of the
screen and find the Add Object Constraint bar.
Figure 85 – Adding an Object Constraints
7. Add a Shrinkwrap constraint to the object.
Figure 86 – Adding a shrinkwrap constraint
8. In the shrinkwrap constraint menu, set the Target to the sphere below.
Figure 87 – Shrinkwrap Target
Now, when we move the object, it will always stay at the surface of the sphere. More
specifically, the origin of the object will be exactly on the surface.
Figure 88 – A shrinkwrap constraint keeping the object at the surface of the
target object.
9. Check the Align to Normal box and set the axis to Z.
Figure 89 – Align to normal
When we move the object around the surface of the sphere, it will now copy the angle
of the surface directly below it.
Figure 90 – An object copying the angle of the face below it
Now that this object is fixed to the surface below it, we need to make it smoothly connect to
the surface. Here is a good way to do that, using some simple vertex weights.
1. In edit mode, extrude the edges at the base of the object and scale them up.
Figure 91 – Extruding the edges at the base of the object
2. Select the inner edge loop at the base and bevel it with Ctrl + B.
Leave some space between the lower edge of the bevel and the outer edge loop.
Figure 92 – Bevelling the edge loop at the base of the object
3. After applying the bevel, a Bevel menu will appear at the bottom left. In the menu, set
the number of segments to 3.
Figure 93 – Setting the number of segments for the bevel
The base of the object is now rounded, but there is still a visible gap between the object and
the surface below it.
Figure 94 – Visible gap between the object and the surface
We will now use a simple trick to make the base stick to the surface.
1. Select all the edge loops in the bevel, including the one at the outer edge.
Figure 95 – Selecting the entire base of the object
2. Find the Object Data Properties tab on the right side of the screen and add a new
vertex group.
Figure 96 – Adding a new vertex group in the object data properties tab
3. Assign the new vertex group to the selection using the Assign button.
Figure 97 – Assigning the vertex group to the selection
4. Select only the outer edge of the base of the object and set the Weight to 1.000. Then,
click Assign again.
Figure 98 – Assigning vertex weight to the selected part of the vertex group
The weight slider indicates Vertex Weight. This determines how much a vertex will be
influenced by the vertex group. We will now apply a modifier to this object to demonstrate
how vertex weights work in practice.
1. Add a Shrinkwrap Modifier (not a constraint) to the object. In the Vertex Group
menu, select the vertex group which we created previously.
By setting the vertex group, we are telling blender to only apply the shrinkwrap
modifier to the vertex group. Since the outer edge has a maximum weight of 1.000, it
will be completely influenced by the modifier.
Other vertices have a weight of 0, so they are not influenced at all.
Figure 99 – Adding a shrinkwrap modifier with a vertex group
2. Select the next edge loop and assign a weight of 0.800.
This will cause the edge loop to be partially influenced by the vertex group. This
means that it will still be affected by the shrinkwrap modifier, but not as much as the
previous edge loop.
Figure 100 – Adding a slightly lower vertex weight to the next edge loop
By assigning a gradually lower vertex weight to each edge loop, we will get a smooth
transition between the object and the surface below, as visible in Figure 101.
Figure 101 – A smooth edge connecting an object to the surface below it
This technique can be used to attach any object to another object with a smooth transition,
while still allowing you to freely move the object elsewhere. It can be used in both hardsurface and organic modelling.
Simplifying Modeling with Loop Tools
The LoopTools add-on one of the most important modeling add-ons. Once you learn to use
them, it is unlikely that you will have a project where you will not use LoopTools a dozen
times. This will allow you speed up your modeling processes and make your life easier.
Figure 102 shows a list of the tools available in the LoopTools add-on. We will learn about
what each tool does, as well as how to use them through step-by-step explanations.
Figure 102 – LoopTools functions
We going to learn how to use these tools one-by-one, with some practical examples.
Bridging
The Bridge tool can be used for making connections between two objects, like in Figure 103.
Figure 103 – Two spheres bridged with LoopTools
Here is how we can correctly and easily bridge objects with this tool.
1. Select a surface with the same number of faces on both meshes.
Figure 104 – Selecting two equal surfaces
2. Press W in edit mode, and in the Loop Tools menu, select Bridge.
Figure 105 – Applying the bridge function
3. Set the number of faces between the separate surfaces by adjusting the number of
segments.
Figure 106 – Bridge segments
4. Adjust the Strength to get the right shape for the bridge.
Increasing the strength will make it appear thinner, while decreasing it will make it
look inflated.
Figure 107 – Adjusting the strength of the bridge
5. Optionally, adjust the Twist value to rotate one end of the bridge and change how the
two surfaces are connected.
Figure 108 – A bridge twisted by two steps
Figure 109 is an example of an object which would require the use of the twist tool.
Figure 109 – An object created with the bridge and
twist tools
We now covered the most important functions of the bridge tool and how it can be used on a
model. Next, let’s discuss the Circle tool.
Circling
We already used the circle tool previously, but let’s explore its features a bit further.
1. Apply the circle tool to one or more full edge loops.
Figure 110 – Applying the circle tool to two edge loops
A Circle menu will appear at the bottom left. Do not switch to object mode or
perform any other operations such as scaling or movement, otherwise the menu will
disappear, and you will have to undo the operation and repeat the circle function.
By default, the two edge loops will form perfect circles and they will be aligned with
each other, but they will not be aligned with other nearby edge loops.
Figure 111 – Two circled edge loops with visible alignment issues
2. Adjust the rotation of the circled edge loops using the Angle slider.
Figure 112 – Adjusting the angle of the circled edge loops
Changing the Influence will change how much force the circle tool will have in modifying
the shape. If the influence is reduced, the edge loop will only complete a part of the
transformation necessary to turn into a circle.
Figure 113 – Changing the influence level of the circle function
We can now turn any edge loops into circles using this function, such as the base of this
trophy-like object. Next, we will discuss the Curve tool.
Curving
Using the curve tool on an edge loop is like adding a tension rod that runs through specific
vertices. It’s hard to imagine without an image, so let’s look at how it works.
Figure 114 shows a subdivided cylinder, with about 10 horizontal subdivisions or loop cuts.
Two vertices on the same vertical edge loop are selected, with a few vertices between them.
Figure 114 – A subdivided cylinder with two vertices
selected
All the vertices on this vertical edge loop are currently in a straight line, which will not allow
the curve tool to work correctly.
Figure 115 – Vertical edge loop
We will move the two vertices away from the surface with Alt + S. Now, we should have two
spikes on the cylinder. Don’t worry about the topology, this is just a demonstration.
Figure 116 – Lifting two vertices from the surface
of the cylinder
With these two vertices selected, apply the Curve function.
Figure 117 – Applying the curve function
Blender will now shape this vertical edge loop so that there is a smooth curve running
through the two vertices, starting, and ending with the first and last vertices of the edge loop,
respectively.
Imagine taking a tension rod and placing it so that it runs through the two vertices. Then, you
have to bend this rod so that it also runs through the first and last vertices of this edge loop. It
would bend exactly like the curve in Figure 117.
Figure 117 – An edge loop after applying the curve function
There are some more things which you can control in the menu, such as changing the
Interpolation from Cubic to Linear. This will make the curve sharp instead of smooth.
Figure 118 – Setting the interpolation to linear
The curve function can be useful at times when smooth, curved edge loops are needed, such
as when modeling certain parts of a car. Next, let’s discuss the convenient Flatten function.
Flattening
The Flatten function is rather simple and self-explanatory. It turns a bumpy surface into a flat
one, while maintaining the direction in which it is facing. To activate this tool, select a
surface and apply the flatten function.
Figure 119 – Flattening a surface on a sphere
You can also align the flattened surface with your view, by changing the Plane setting.
Figure 120 – Aligning the flat surface with the 3d view
I personally rarely use the flatten function, but it can be useful in some cases. Next, let’s learn
to straighten edge loops with the Gstretch function.
Gstretching
The Gstretch function takes a curved or bent edge loop and turns it into a straight line. This
can be done in several ways. We will now learn how to use it correctly and how it can be
useful.
To start, select a part of an edge loop on a subdivided cube, like in Figure 121. If you want to
use another object, make sure that your edge loop is either curved or bent at an angle.
Figure 121 – Selecting an edge loop for Gstretching
The Gstretch function will then turn this bent edge loop into a straight line, like in Figure
122. This can also be used to create a dent effect, where it looks like the object was struck by
a blade.
Figure 122 – Edge loop straightened by the Gstretch
function
Gstretching can be useful for aligning geometry, cleaning up topology and making your
geometry easier to work with.
Figure 123 – Using the Gstretch function to straighten an edge loop and clean up the topology
Moving on, we will discuss one of the more interesting tools available in the LoopTools
addon, called Loft.
Lofting
The Loft function works very much like the bridge tool. We can use these functions
interchangeably for bridging two edge loops like we did earlier with the bridge function.
Lofting, however, has additional abilities which make more powerful. With the loft function,
we can bridge multiple edge loops simultaneously to create a tunnel, like in Figure 124.
Figure 124 – Lofting multiple circles to create a tunnel
We can push this a step further by placing the circles in such a way that they create a circular
formation and connect back to the first circle, like in Figure 125. To complete the loop, check
the Loop box in the Bridge/Loft menu which appears in the bottom left.
Figure 125 – Lofting a full loop
This function often fails, and creates unwanted and uneven twists, like in Figure 126. We can
see two segments with unexpected twisting.
Figure 126 – Unexpected twisting caused by lofting
This error is apparently random and can be prevented by lofting the circle part by part. For
example, we can loft one half first and then the second half.
Figure 127 – Lofting two sections separately to prevent twisting
If a section is particularly persistent in causing unexpected twisting, you can manually adjust
some of its settings after lofting it individually. Try twisting it or checking the Reverse box.
Figure 128 – Manually adjusting an individual section for lofting
We can now easily create tunnels, pipes, cables, ropes and similar objects with the loft tool.
Next, we will learn how to use a Relax tool to further contribute to the loft tool.
Relaxing
Relaxing an edge loop means reducing the sharpness of the angles between its edges. Figure
129 shows a simple shape before and after relaxing. By relaxing the edges on its sides, the
90˚ angle turns into a 53˚ angle.
Figure 129 – Relaxing a simple shape
Here is another example of how this tool works, on a subdivided edge loop with sharp edges.
In Figure 130, sharp and pointy angles are rounded, as if we applied a subdivision surface
modifier without subdividing the mesh further.
Figure 130 – The relax function used on a pointy edge loop to make it smoother
If we create a tunnel, rope, or something similar with the loft tool, we can make it a lot
smoother using the relax function. In Figure 131, we start with a tunnel created by lofting a
few edge loops with multiple segments between them. The tunnel has some sharp turns and
does not flow very smoothly. By applying the relax function several times to the vertical edge
loops, we can make this shape mush smoother.
Figure 131 – Using the relax function to improve the effect of lofting
The relax tool is very useful for organic modelling because of how much it helps to create
smooth, round and curvy surfaces. Next, we will discuss the Space function.
Spacing
The space function simply adjusts the length of edges in an edge loop. By default, it gives all
edges in a selected edge loop the exact same length, as shown in Figure 132.
Figure 132 – Using the space function to create equal spaces between the edges of
selected edge loops
This is another useful clean-up function for making your topology more organized.
We now covered the information necessary to prepare you for creating higher quality models.
These topology techniques and modeling methods are unpopular amongst beginners because
they require a deeper understanding of how Blender works. If you came this far, you have
received enough information to separate you from 80% of 3D artists, and you can use these
skills to advance into professional skill levels.
Summary of Terms
The following is a list of terms, definitions, tools and shortcuts which were used or
mentioned in this guide. The list also includes other fundamental definitions which were not
mentioned.
Definitions
Topology: The arrangement and flow of polygons on the surface on a mesh.
Vertex: A single point.
Edge: The line connecting two vertices.
Face: The surface between three or more edges.
Polygon: A 2-dimensional shape, such as a triangle, rectangle, or pentagon.
Quad: A 4-sided polygon
Tri: A 3-sided polygon
N-gon: A polygon with more than 4 sides
Equilateral: Made up of edges which all have the same length
Blender Terms
Shading Artifacts: Unwanted lines or shapes appearing on surfaces, usually because of bad
topology
Edit Mode: The workspace, toggled with Tab, which allows the editing of individual edges,
vertices and polygons using various tools.
Object Mode: The workspace, toggled with Tab, which allows the user to work with whole
objects as opposed to polygons and meshes.
Vertex Select: Activated with 1, allowing the user to select individual vertices in edit mode.
Edge Select: Activated with 2, allowing the user to select individual edges in edit mode.
Face Select: Activated with 3, allowing the user to select individual faces in edit mode.
Add-ons: Toolkits which are not available in Blender by default but can be either
downloaded or activated in Preferences.
Destructive Workflow: A workflow which permanently changes the mesh in a way that
cannot be easily changed or undone.
Non-Destructive Workflow: A workflow which makes changes to a mesh that can easily be
changed or undone.
Tools, Modifiers and Shortcuts
Subdivision Surface Modifier: A modifier which divides an objects mesh and makes it
smoother.
Boolean Modifier: A modifier which can calculate the union, intersection, or difference of
two objects to either join, reshape, or cut objects.
Mirror Modifier: A modifier which copies and reflects the mesh across the object’s origin in
real time.
Shrinkwrap Modifier: A modifier which projects a mesh onto the surface of another object.
Cast Modifier: A modifier used for reshaping meshes into other objects, such as a sphere.
Shrinkwrap Constraint: A constraint used for gluing objects to surfaces on other objects.
Shift + A: Add Menu. Used for adding new objects in object mode or new meshes in edit
mode.
Ctrl + R: Loop Cut. Creates a new edge loop.
Ctrl + J: Join. Merges two or more objects in object mode into a single object.
E: Extrude. Extrudes a face, vertex, or edge.
I: Inset. Creates a new face inside a selected face, or a new set of faces in a selected surface.
F: Fill. Creates a new face or edge between the selected edges or vertices.
G: Grab. Used for moving objects in object mode or meshes and polygons in edit mode.
S: Scale. Changes the size of objects and meshes, relative to the pivot point.
R: Rotate. Turns objects and meshes relative to the pivot point.
X/Delete: Opens the delete menu, where items can be deleted or dissolved.
W: Edge Context Menu. In edit mode, it provides the user with LoopTools, edge-bridging,
subdivision, and other functions.
CTRL + RMB: Select the surface between a previously selected item and the item selected
with this shortcut.
Alt + RMB: Selects an entire edge, vertex, or face loop.
Shift + S: Opens the snap menu which is used for moving the 3D cursor and other objects.
Shift + NUM7: Align the 3D view with a selected face in edit mode.
The Author
I am a Blender 3D YouTuber and author of Blender 3D: Incredible Models. I have been
studying Blender for nearly a decade, since the age of 13. I believe in providing real value
and guidance with no unnecessary sugar-coating, and it is my mission to build a positive,
inspirational, and uplifting environment where everyone can learn. I have thus created a free
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