OpenVDB: Voxel Remesher

The voxel remesher introduces a new workflow for sculpting without any of the limitations of Dyntopo (no geometry errors or performance penalty when blocking shapes). It is also useful for simulations and 3D printing.

This commit includes:
- Voxel remesh operator, voxel size mesh property and general remesh flags.
- Paint mask reprojection.
- Geometry undo/redo for sculpt mode. This should support remesh operations as well as future tools that modify the topology of the sculpt in a single step, like trimming tools or mesh insert brushes.
- UI changes in the sculpt topbar and the mesh properties pannel.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5407

1 files changed, 24 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_mesh.c b/source/blender/makesrna/intern/rna_mesh.c
index 03173bcb3da..966dc071641 100644
--- a/source/blender/makesrna/intern/rna_mesh.c
+++ b/source/blender/makesrna/intern/rna_mesh.c
@@ -2998,6 +2998,30 @@ static void rna_def_mesh(BlenderRNA *brna)
   rna_def_paint_mask(brna, prop);
   /* End paint mask */
 
+  /* Remesh */
+  prop = RNA_def_property(srna, "remesh_voxel_size", PROP_FLOAT, PROP_DISTANCE);
+  RNA_def_property_float_sdna(prop, NULL, "remesh_voxel_size");
+  RNA_def_property_float_default(prop, 0.1f);
+  RNA_def_property_range(prop, 0.00001f, FLT_MAX);
+  RNA_def_property_ui_range(prop, 0.0001f, FLT_MAX, 0.01, 4);
+  RNA_def_property_ui_text(prop,
+                           "Voxel size",
+                           "Size of the voxel in object space used for volume evaluation. Lower "
+                           "values preserve finer details");
+  RNA_def_property_update(prop, 0, "rna_Mesh_update_draw");
+
+  prop = RNA_def_property(srna, "remesh_smooth_normals", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "flag", ME_REMESH_SMOOTH_NORMALS);
+  RNA_def_property_ui_text(prop, "Smooth normals", "Smooth the normals of the remesher result");
+  RNA_def_property_update(prop, 0, "rna_Mesh_update_draw");
+
+  prop = RNA_def_property(srna, "remesh_preserve_paint_mask", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "flag", ME_REMESH_REPROJECT_PAINT_MASK);
+  RNA_def_property_boolean_default(prop, false);
+  RNA_def_property_ui_text(prop, "Preserve Paint Mask", "Keep the current mask on the new mesh");
+  RNA_def_property_update(prop, 0, "rna_Mesh_update_draw");
+  /* End remesh */
+
   prop = RNA_def_property(srna, "use_auto_smooth", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", ME_AUTOSMOOTH);
   RNA_def_property_ui_text(