Volumes: new Volume to Mesh modifier

This modifier is the opposite of the recently added Mesh to Volume modifier.
It converts the "surface" of a volume into a mesh. The "surface" is defined
by a threshold value. All voxels with a density higher than the threshold
are considered to be inside the volume, while all others will be outside.

By default, the resolution of the generated mesh depends on the voxel
size of the volume grid. The resolution can be customized. It should be
noted that a lower resolution might not make this modifier faster. This
is because we have to downsample the openvdb grid, which isn't a cheap
operation.

Converting a mesh to a volume and then back to a mesh is possible,
but it does require two separate mesh objects for now.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D9141

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/modifiers/MOD_modifiertypes.h b/source/blender/modifiers/MOD_modifiertypes.h
index 6dc50e1b47d..9c488780366 100644
--- a/source/blender/modifiers/MOD_modifiertypes.h
+++ b/source/blender/modifiers/MOD_modifiertypes.h
@@ -88,6 +88,7 @@ extern ModifierTypeInfo modifierType_WeightedNormal;
 extern ModifierTypeInfo modifierType_Simulation;
 extern ModifierTypeInfo modifierType_MeshToVolume;
 extern ModifierTypeInfo modifierType_VolumeDisplace;
+extern ModifierTypeInfo modifierType_VolumeToMesh;
 
 /* MOD_util.c */
 void modifier_type_init(ModifierTypeInfo *types[]);