Setting Materials for OBJ about fpsci

[jspjutNV]

If we keep following our current method of having models that include a flipped border geometry outside, we are probably okay having a specific object mesh/material designed to be the object and another designed to be the silhouette. Since we started with a icosahedron target, core/icosahedron_default was the material, but we could go in and change that to a more logical name like core/core or something.

I suggest we de-prioritize this fix until someone needs a wide variety of different target models since that would give us more information about how much we'd be able to modify the .objs vs. just use .objs made by someone else without modification.

[bboudaoud-nv]

I agree that this is not a high priority considering our (somewhat unique) approach to winding-order based geometry, I also agree that we should move to a more generic name (maybe core/target?). If you'd like we can keep this issue around as a reminder to transition to a more generic name.