Understanding Material IDs
In the context of 3D computer graphics, a material ID (also known as a material identifier or material index) is an attribute assigned to different parts or surfaces of a 3D model. It is used to define and differentiate between various materials or shaders applied to different portions of the model.
Let’s say you have a 3D model of a car consisting of separate objects, such as the body, windows, wheels, and headlights. To apply different materials to each component, you would assign a unique material ID to each part, as follows:
- Body: Material ID 1 (assigned color: red)
- Windows: Material ID 2 (assigned color: transparent)
- Wheels: Material ID 3 (assigned color: black)
- Headlights: Material ID 4 (assigned color: yellow)
Material IDs are particularly useful when you want to apply complex materials or textures to specific regions of a 3D model, as they provide a convenient way to differentiate between different material assignments...
