This sample demonstrates usage of the EXT_mesh_features extension for storing feature IDs and properties associated with the surface of a primitive, using a feature ID texture.
The sample contains a glTF asset with a single mesh primitive. The mesh primitive consists of a quad (the unit square), formed by 2 triangles. The vertices in this mesh primitive have the usual POSITION, NORMAL, and TEXCOORD_0 vertex attributes.
The feature IDs in this example are given with a feature ID texture. The feature ID texture has a size of 16x16 pixels, and defines feature IDs for components of a house.
The example also defines a standard texture that is used for rendering the quad. It is a texture with a size of 256x256 pixels, that shows the feature IDs that are stored in the 16x16 pixel feature ID texture:
This example can be viewed with the common sandcastle code.