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, 17 insertions, 6 deletions

diff --git a/modules/vhacd/register_types.cpp b/modules/vhacd/register_types.cpp
index 2b48e94604..88b2a568ea 100644
--- a/modules/vhacd/register_types.cpp
+++ b/modules/vhacd/register_types.cpp
@@ -32,7 +32,23 @@
 #include "scene/resources/mesh.h"
 #include "thirdparty/vhacd/public/VHACD.h"
 
-static Vector<Vector<Face3>> convex_decompose(const Vector<Face3> &p_faces, int p_max_convex_hulls = -1) {
+static Vector<Vector<Face3>> convex_decompose(const Vector<Face3> &p_faces, const Mesh::ConvexDecompositionSettings &p_settings) {
+	VHACD::IVHACD::Parameters params;
+	params.m_concavity = p_settings.max_concavity;
+	params.m_alpha = p_settings.symmetry_planes_clipping_bias;
+	params.m_beta = p_settings.revolution_axes_clipping_bias;
+	params.m_minVolumePerCH = p_settings.min_volume_per_convex_hull;
+	params.m_resolution = p_settings.resolution;
+	params.m_maxNumVerticesPerCH = p_settings.max_num_vertices_per_convex_hull;
+	params.m_planeDownsampling = p_settings.plane_downsampling;
+	params.m_convexhullDownsampling = p_settings.convexhull_downsampling;
+	params.m_pca = p_settings.normalize_mesh;
+	params.m_mode = p_settings.mode;
+	params.m_convexhullApproximation = p_settings.convexhull_approximation;
+	params.m_oclAcceleration = true;
+	params.m_maxConvexHulls = p_settings.max_convex_hulls;
+	params.m_projectHullVertices = p_settings.project_hull_vertices;
+
 	Vector<real_t> vertices;
 	vertices.resize(p_faces.size() * 9);
 	Vector<uint32_t> indices;
@@ -47,11 +63,6 @@ static Vector<Vector<Face3>> convex_decompose(const Vector<Face3> &p_faces, int
 		}
 	}
 
-	VHACD::IVHACD::Parameters params;
-	if (p_max_convex_hulls > 0) {
-		params.m_maxConvexHulls = p_max_convex_hulls;
-	}
-
 	VHACD::IVHACD *decomposer = VHACD::CreateVHACD();
 	decomposer->Compute(vertices.ptr(), vertices.size() / 3, indices.ptr(), indices.size() / 3, params);