Geometry Nodes: add Volume to Mesh node

This node takes a volume and generates a mesh on it's "surface".
The surface is defined by a threshold value.

Currently, the node only works on volumes generated by the
Points to Volume node. This limitation will be resolved soonish.

Ref T84605.

Differential Revision: https://developer.blender.org/D10243

1 files changed, 43 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_volume_to_mesh.hh b/source/blender/blenkernel/BKE_volume_to_mesh.hh
new file mode 100644
index 00000000000..1ec8a8e84cd
--- /dev/null
+++ b/source/blender/blenkernel/BKE_volume_to_mesh.hh
@@ -0,0 +1,43 @@
+/*
+ * 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.
+ */
+
+#include "DNA_modifier_types.h"
+
+#ifdef WITH_OPENVDB
+#  include <openvdb/openvdb.h>
+#endif
+
+struct Mesh;
+struct VolumeGrid;
+
+namespace blender::bke {
+
+struct VolumeToMeshResolution {
+  VolumeToMeshResolutionMode mode;
+  union {
+    float voxel_size;
+    float voxel_amount;
+  } settings;
+};
+
+#ifdef WITH_OPENVDB
+struct Mesh *volume_to_mesh(const openvdb::GridBase &grid,
+                            const VolumeToMeshResolution &resolution,
+                            const float threshold,
+                            const float adaptivity);
+#endif
+
+}  // namespace blender::bke