Voxel Remesh: Fix poles and preserve volume

This commit fixes most of the issues we currently have in the voxel remesher. Mesh volume is preserved when doing multiple iterations, so the sculpt won't shrink and smooth each time you run the remesher. Mesh topology is much better, fixing most issues related to mask extraction and other topology based operations.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D5863

1 files changed, 34 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/shrinkwrap.c b/source/blender/blenkernel/intern/shrinkwrap.c
index 992ceda7b74..797ae0f0a8a 100644
--- a/source/blender/blenkernel/intern/shrinkwrap.c
+++ b/source/blender/blenkernel/intern/shrinkwrap.c
@@ -1506,3 +1506,37 @@ void BKE_shrinkwrap_mesh_nearest_surface_deform(struct bContext *C,
 
   MEM_freeN(vertexCos);
 }
+
+void BKE_shrinkwrap_remesh_target_project(Mesh *src_me, Mesh *target_me, Object *ob_target)
+{
+  ShrinkwrapModifierData ssmd = {0};
+  int totvert;
+
+  ssmd.target = ob_target;
+  ssmd.shrinkType = MOD_SHRINKWRAP_TARGET_PROJECT;
+  ssmd.shrinkMode = MOD_SHRINKWRAP_ON_SURFACE;
+  ssmd.keepDist = 0.0f;
+
+  float(*vertexCos)[3] = BKE_mesh_vert_coords_alloc(src_me, &totvert);
+
+  ShrinkwrapCalcData calc = NULL_ShrinkwrapCalcData;
+
+  calc.smd = &ssmd;
+  calc.numVerts = src_me->totvert;
+  calc.vertexCos = vertexCos;
+  calc.vgroup = -1;
+  calc.target = target_me;
+  calc.keepDist = ssmd.keepDist;
+  BLI_SPACE_TRANSFORM_SETUP(&calc.local2target, ob_target, ob_target);
+
+  ShrinkwrapTreeData tree;
+  if (BKE_shrinkwrap_init_tree(&tree, calc.target, ssmd.shrinkType, ssmd.shrinkMode, false)) {
+    calc.tree = &tree;
+    TIMEIT_BENCH(shrinkwrap_calc_nearest_surface_point(&calc), deform_surface);
+    BKE_shrinkwrap_free_tree(&tree);
+  }
+
+  BKE_mesh_vert_coords_apply(src_me, vertexCos);
+
+  MEM_freeN(vertexCos);
+}