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Options to clean/simplify convex hull generated from mesh

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Clean: remove duplicate and interior vertices (uses Bullet algorithm)
Simplify: modify the geometry for further simplification (uses VHACD
algorithm)

In the editor, single convex hull now uses the clean option.
Added a new editor entry to create a simplified convex hull, can be
useful for creating convex hull from highly tessellated triangle meshes.
This commit is contained in:
PouleyKetchoupp
2021-07-07 12:14:12 -07:00
parent 56d7126864
commit 1de995ae99
10 changed files with 71 additions and 22 deletions
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31
scene/resources/mesh.cpp
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@ -30,6 +30,7 @@
#include "mesh.h"
#include "core/math/convex_hull.h"
#include "core/templates/pair.h"
#include "scene/resources/concave_polygon_shape_3d.h"
#include "scene/resources/convex_polygon_shape_3d.h"
@ -221,9 +222,17 @@ Vector<Face3> Mesh::get_faces() const {
*/
}
Ref<Shape3D> Mesh::create_convex_shape() const {
Vector<Vector3> vertices;
Ref<Shape3D> Mesh::create_convex_shape(bool p_clean, bool p_simplify) const {
if (p_simplify) {
Vector<Ref<Shape3D>> decomposed = convex_decompose(1);
if (decomposed.size() == 1) {
return decomposed[0];
} else {
ERR_PRINT("Convex shape simplification failed, falling back to simpler process.");
}
}
Vector<Vector3> vertices;
for (int i = 0; i < get_surface_count(); i++) {
Array a = surface_get_arrays(i);
ERR_FAIL_COND_V(a.is_empty(), Ref<ConvexPolygonShape3D>());
@ -232,6 +241,18 @@ Ref<Shape3D> Mesh::create_convex_shape() const {
}
Ref<ConvexPolygonShape3D> shape = memnew(ConvexPolygonShape3D);
if (p_clean) {
Geometry3D::MeshData md;
Error err = ConvexHullComputer::convex_hull(vertices, md);
if (err == OK) {
shape->set_points(md.vertices);
return shape;
} else {
ERR_PRINT("Convex shape cleaning failed, falling back to simpler process.");
}
}
shape->set_points(vertices);
return shape;
}
@ -543,12 +564,12 @@ void Mesh::clear_cache() const {
debug_lines.clear();
}
Vector<Ref<Shape3D>> Mesh::convex_decompose() const {
Vector<Ref<Shape3D>> Mesh::convex_decompose(int p_max_convex_hulls) const {
ERR_FAIL_COND_V(!convex_composition_function, Vector<Ref<Shape3D>>());
const Vector<Face3> faces = get_faces();
Vector<Vector<Face3>> decomposed = convex_composition_function(faces);
Vector<Vector<Face3>> decomposed = convex_composition_function(faces, p_max_convex_hulls);
Vector<Ref<Shape3D>> ret;
@ -1852,7 +1873,7 @@ void ArrayMesh::_bind_methods() {
ClassDB::bind_method(D_METHOD("surface_set_name", "surf_idx", "name"), &ArrayMesh::surface_set_name);
ClassDB::bind_method(D_METHOD("surface_get_name", "surf_idx"), &ArrayMesh::surface_get_name);
ClassDB::bind_method(D_METHOD("create_trimesh_shape"), &ArrayMesh::create_trimesh_shape);
ClassDB::bind_method(D_METHOD("create_convex_shape"), &ArrayMesh::create_convex_shape);
ClassDB::bind_method(D_METHOD("create_convex_shape", "clean", "simplify"), &ArrayMesh::create_convex_shape, DEFVAL(true), DEFVAL(false));
ClassDB::bind_method(D_METHOD("create_outline", "margin"), &ArrayMesh::create_outline);
ClassDB::bind_method(D_METHOD("regen_normal_maps"), &ArrayMesh::regen_normal_maps);
ClassDB::set_method_flags(get_class_static(), _scs_create("regen_normal_maps"), METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);