Rendering Clouds using the Volume Shader

 

This simple tutorial demonstrates how to create a cloud effect using a combination of the Volume Shader with a Maya Cloud 3d texture. It is possible to achieve a wide range of cloudy skies using this setup. 

The scene can be downloaded here.

 

  • To represent the cloud layer, we must first create an object with which we can assign a Volume shader. Create a sphere or cube and scale it down in the Y axis. 
  • Increase the Step Size of the sphere to around 0.1. When the Step Size is positive, it turns the polymesh into a volume.

The step size has a fixed size, therefore, the larger the container, the more steps will be taken and the longer it will take to render. Also, beware that if the step size is too small your render times will increase.

Step Size in Arnold Volume Attributes of sphere

  • Create a Maya Cloud 3d texture and connect it to the Transparent Weight of the Standard Volume shader. Decrease the scale of the Maya 3d texture node for the Cloud texture to see more detail.
  • Finally, create a Skydome light and connect a Physical Sky shader to its Color attribute. To reduce any noise in the volume, you must increase the number of Volume Samples in the Skydome light.
  • No labels