add texture to just one face of a cube primitive

Unity Engine
1

I want to add a texture to just one face of a cube primitive.
I can’t find any info about how to do that.
It has to be done dynamically as my cubes are created dynamically.
I looked up cubemaps but can’t find any way to access or change the textures of the faces.
CubeMapFace.PositiveX for instance is not used this way.

This is for a microscopy project that uses a stack of thing objects to represent a 3d structure.

P.S. I can’t use planes because another part of the application requires them to be cube primitives.

Thanks for any ideas.
Dan

2

nope, you’ll need to build one out of quads or import one from blender.