To add collision to a 3D model in Godot, parent a CollisionShape3D or CollisionPolygon3D node to the model’s MeshInstance3D, then assign a matching collision shape (e.g., BoxShape3D, SphereShape3D).
- This collision node acts as the model’s "hitbox," letting Godot’s physics engine detect collisions or overlaps with other objects. - For complex models: Use ConvexPolygonShape3D (convex shapes) or CompoundShape3D (multi-part objects). Adjust the shape’s size/position to match the model closely for accurate physics.