To cut environment 3D models fast, use software with efficient boolean tools (e.g., Blender’s Bool Tool, Maya’s Boolean Geometry) or trim functions, and simplify high-poly models first to reduce processing time.
Boolean tools let you quickly subtract, intersect, or union shapes (like cutting doors in walls), while trim functions handle surface edges for precise cuts—both are faster than manual vertex editing. Simplifying models (e.g., decimating extra polygons) removes detail that slows down cutting tools.
For beginners, Blender’s free Bool Tool works well with low-poly environments. Duplicate your model, simplify the copy, and test cuts without risking the original.