CSG RigidBody collision shape not working as expected

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:bust_in_silhouette: Asked By NullPointer

Hi i try to build RigidBody from a generated CSG model and run into multiple problems.

The RigidBody is create by adding the collision shape build form the CSG node.
I try to use create_convex_shape() and create_trimesh_shape() with different results.

I had also problems with the collision shape scale (documented in the source)

You can downlad the example projekt and press ‘g’ to generate the models and navigate by w,a,s,d

:bust_in_silhouette: Reply From: Saitodepaula

What was your step by step procedure to get the meshes?

I think you don’t need to make a mesh out of the CSG. Just create a RIGID BODY, create the CSGs as childs of the rigid body, and COLLISION SHAPES as childs of the rigid body too.

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Hi thanks for your anwser.

The example was just a simple CSG model and apply multiple basic collision shapes is not a option for me.
The CSG models are procedual generated and can have a complex shape.
I need to extract the final result out of a CSG operation to build the exact collision shape.

It looks like it is a gereral bug in Godot, i tested with a imported meshes and generate a trimesh shape as collision shape from it.
All Ridigbodys with a trimesh shape not interact with it self, but build a concex shape it works.
Use a convex shape is not exact enough, and i found some differences between the implemented Physics engine (GodotPhysics, BullettPhysics).

NullPointer | 2019-12-06 06:57