Improve collision generation usability in the new 3D scene import workflow.

With this PR it's possible to add a collision during the Mesh import, directly in editor.
To generate the shape is possible to chose between the following options:
- Decompose Convex: The Mesh is decomposed in one or many Convex Shapes (Using the VHACD library).
- Simple Convex: Is generated a convex shape that enclose the entire mesh.
- Trimesh: Generate a trimesh shape using the Mesh faces.
- Box: Add a primitive box shape, where you can tweak the `size`, `position`, `rotation`.
- Sphere: Add a primitive sphere shape, where you can tweak the `radius`, `position`, `rotation`.
- Cylinder: Add a primitive cylinder shape, where you can tweak the `height`, `radius`, `position`, `rotation`.
- Capsule: Add a primitive capsule shape, where you can tweak the `height`, `radius`, `position`, `rotation`.

It's also possible to chose the generated body, so you can create:
- Rigid Body.
- Static Body.
- Area.

1 files changed, 2 insertions, 1 deletions

diff --git a/scene/3d/mesh_instance_3d.cpp b/scene/3d/mesh_instance_3d.cpp
index de6925244a..7e7db57af3 100644
--- a/scene/3d/mesh_instance_3d.cpp
+++ b/scene/3d/mesh_instance_3d.cpp
@@ -274,7 +274,8 @@ Node *MeshInstance3D::create_multiple_convex_collisions_node() {
 		return nullptr;
 	}
 
-	Vector<Ref<Shape3D>> shapes = mesh->convex_decompose();
+	Mesh::ConvexDecompositionSettings settings;
+	Vector<Ref<Shape3D>> shapes = mesh->convex_decompose(settings);
 	if (!shapes.size()) {
 		return nullptr;
 	}