Make rigidbody simulation handle animated objects gracefully

The animated objects was not updated for each internal substep for the rigidbody sim.
This would lead to unstable simulations or very annoying clipping artifacts.

Updated the code to use explicit substeps and tie it to the scene frame rate.

Fix T47402: Properly updating the animated objects fixes the reported issue.

Reviewed By: Brecht, Jacques

Differential Revision: http://developer.blender.org/D8762

1 files changed, 83 insertions, 0 deletions

diff --git a/intern/rigidbody/rb_convex_hull_api.cpp b/intern/rigidbody/rb_convex_hull_api.cpp
new file mode 100644
index 00000000000..c5893a4c808
--- /dev/null
+++ b/intern/rigidbody/rb_convex_hull_api.cpp
@@ -0,0 +1,83 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2020 Blender Foundation,
+ * All rights reserved.
+ */
+
+#include "LinearMath/btConvexHullComputer.h"
+#include "RBI_hull_api.h"
+
+plConvexHull plConvexHullCompute(float (*coords)[3], int count)
+{
+  btConvexHullComputer *computer = new btConvexHullComputer;
+  computer->compute(reinterpret_cast<float *>(coords), sizeof(*coords), count, 0, 0);
+  return reinterpret_cast<plConvexHull>(computer);
+}
+
+void plConvexHullDelete(plConvexHull hull)
+{
+  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
+  delete computer;
+}
+
+int plConvexHullNumVertices(plConvexHull hull)
+{
+  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
+  return computer->vertices.size();
+}
+
+int plConvexHullNumFaces(plConvexHull hull)
+{
+  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
+  return computer->faces.size();
+}
+
+void plConvexHullGetVertex(plConvexHull hull, int n, float coords[3], int *original_index)
+{
+  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
+  const btVector3 &v(computer->vertices[n]);
+  coords[0] = v[0];
+  coords[1] = v[1];
+  coords[2] = v[2];
+  (*original_index) = computer->original_vertex_index[n];
+}
+
+int plConvexHullGetFaceSize(plConvexHull hull, int n)
+{
+  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
+  const btConvexHullComputer::Edge *e_orig, *e;
+  int count;
+
+  for (e_orig = &computer->edges[computer->faces[n]], e = e_orig, count = 0;
+       count == 0 || e != e_orig;
+       e = e->getNextEdgeOfFace(), count++) {
+    ;
+  }
+  return count;
+}
+
+void plConvexHullGetFaceVertices(plConvexHull hull, int n, int *vertices)
+{
+  btConvexHullComputer *computer(reinterpret_cast<btConvexHullComputer *>(hull));
+  const btConvexHullComputer::Edge *e_orig, *e;
+  int count;
+
+  for (e_orig = &computer->edges[computer->faces[n]], e = e_orig, count = 0;
+       count == 0 || e != e_orig;
+       e = e->getNextEdgeOfFace(), count++) {
+    vertices[count] = e->getTargetVertex();
+  }
+}