Hi. @Knightro63!
Some addings for BufferGeometryUtils:
-Added method mergeGeometries.

Summary

• Implemented BufferGeometryUtil.mergeGeometries to safely merge multiple BufferGeometry instances.
• Added validation for:
  • Matching attribute sets across all geometries.
  • Matching morph attribute sets and morphTargetsRelative flag.
  • Consistent indexing (all indexed or all non-indexed).
• Added _mergeAttributes helper to combine BufferAttribute arrays into a single attribute.
• Optional useGroups parameter to preserve material group information.

Why

Ensures merged geometries are compatible and prevents runtime errors due to mismatched attributes.

Notes

• Returns null if geometries are incompatible.
• Prints debug messages for mismatches (can be replaced with logging later).

Have a nice day!