Adding new materials for each convex hull when saved as an OBJ file

[adnanmunawar]

Adds an option to generate a companion Material Template Library (.mtl) file when exporting to Wavefront (OBJ) format, assigning random colors to individual convex hulls.

Why This Matters:

• Blender Workflow: Blender imports OBJ files without materials as multiple disconnected meshes.
• Vertex Groups: Adding unique materials allows Blender to automatically import the file as a single mesh partitioned into distinct vertex groups.
• Efficiency: Eliminates manual mesh separation and organization steps for users post-import.

Changes:

• Added .mtl file generation logic for OBJ exports.
• Implemented random color assignment per convex hull.
• Introduced user toggle to make material generation optional.