RPRMakie can do face-colored meshes natively

[asinghvi17]

https://radeon-pro.github.io/RadeonProRenderDocs/en/sdk/info_setting_types/rpr_primvar_interpolation_type.html?highlight=primvar

From this link as of the date this issue was opened,

Name	Value	Brief Explanation
RPR_PRIMVAR_INTERPOLATION_CONSTANT	0x1	This primvar set has a unique constant value for the whole shape.
RPR_PRIMVAR_INTERPOLATION_UNIFORM	0x2	Each face is mapped to a value. There is no interpolation between faces.
RPR_PRIMVAR_INTERPOLATION_VERTEX	0x3	Each vertex is mapped to a value. The primvar lookup uses vertice positions to interopolate each primvar value.
RPR_PRIMVAR_INTERPOLATION_FACEVARYING_NORMAL	0x4	Each vertex is mapped to a value. The primvar lookup uses vertice normals to interopolate each primvar value.
RPR_PRIMVAR_INTERPOLATION_FACEVARYING_UV	0x5	Each vertex is mapped to a value. The primvar lookup uses vertice UVs to interopolate each primvar value.

this seems like we can attach data to meshes in a wide variety of ways. This may be useful for images/heatmaps in transformed space!