The Particle Map is a utility node that provides particle-based shading. It does not have any adjustable parameters. It is used in two types of setups:
When used as a map in a material assigned to VRayProxy and alembic particles are present in the specified mesh file, it returns the color from the .color channel of the particles.
When used as a map in a material assigned to VRayMetaball surface, VRayParticleTex returns the color(s) defined by a Particle Flow operator. The VRayMetaball color source option defines what operator will be used (Display, VRayParticleColor or a scripted vector).
