Procedural 3D Modeling Using Geometry Nodes in Blender by Siemen Lens

Author:Siemen Lens
Language: eng
Format: epub
Publisher: Packt
Published: 2023-11-15T00:00:00+00:00

Adding noise to your Curves

In this section, we will show you how to manipulate your Curves by adding a noise pattern to them. This will be handy if you’re making anything that involves a curved line of some sort, for example, a lightning bolt or a tree trunk.

In the following figure, you can see the nodes that we will be using in this section.

Figure 8.1: The nodes you’ll need

Let us take a quick look at the individual nodes:

The Noise Texture node – We will need the Noise Texture node to add noise randomization to our Curve.

The Combine XYZ node – This node will be used to combine the x, y, and z values into a vector value that we can use in the Offset input of the next node that we will need to add noise to our Curve.

The Set Position node – This is the most important node in this section because it is responsible for modifying our Curve. The task of this node is to set the position of different points in your geometry. For example, this can be used to add some randomization to your Curve by plugging in a noise map into the Offset socket.

The Vector Math node – We will make use of the Vector Math node. By default, Blender’s noise textures aren’t normalized to average out to 0. This means that your midlevel will be off by 0.5. To counteract this, we will need a Vector Math node to subtract the midlevel value to 0.

The Resample Curve node – Lastly, this node will interpolate geometry into your curve. In the case of this demonstration, we will be using this node to get more geometry into our Curve with the help of a higher resampling count to get a better-looking noise pattern. A higher resampling count means a higher resolution of your Curve and more geometry in your Curve.

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