The exported hair is loaded through a V-Ray Proxy and a V-Ray Hair Next Material is assigned to it. A Vertex Color 1 texture is piped into the melanin_texture parameter of the Hair material. You need to press the Update button after applying the material and assigning the texture for the custom attributes stored in the Alembic file to show up. Opening the Channel Name drop-down lists all attributes stored in the Alembic file. In this case, my_melanin_attr is a float so we need to specify the Sub Channel parameter as well. In this case it's Red but that may differ in your scene so make sure to take note of the prefix r_ , g_ and b_ which specify what Sub-Channel should be set for the chosen attribute (ie. Red for r_, Green for g_ and Blue for b_). You can now press Render and everything should work right out of the box. |