The Color Vertex attribute node is designed for use with imported ORBXThe ORBX file format is the best way to transfer scene files from 3D Authoring software programs that use the Octane Plug-in such as Octane for Maya, Octane for Cinema 4D, or OctaneRender Standalone. This format is more efficient than FBX when working with Octane specific data as it provides a flexible, application independent format. ORBX is a container format that includes all animation data, models, textures etc. that is needed to transfer an Octane scene from one application to another.® packages. OctaneRender® uses vertex colors or other vertex attributes while rendering materials. OctaneRender loads and interpolates both real numbers and colors over the scene's triangles and sends them to the OSL shaders.
Figure 1: Color Vertex Attribute sample
Note: You need OctaneRender Standalone to create ORBX packages. Please refer to the OctaneRender Standalone documentation for more detailed information.