The Houdini unity Material is a special attribute that is added to vertices using a Attribute Create SOP node.
- Create UVs for graph geometry.
- Create an Attribute Create SOP node.
- For the Name field enter unity_material.
- For the String field enter something like Assets/Materials/GizmosMaterial.mat, this is the path to the material in Unity. (TODO research if we can use env variables)
