Volumes: new Mesh to Volume modifier

This modifier can only be added to Volume objects. It takes a mesh
as input and generates a "density" grid near the surface or in
the enclosed volume.

Ref T73201.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D9032

1 files changed, 34 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index c0716388f28..7218e75a404 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -95,6 +95,7 @@ typedef enum ModifierType {
   eModifierType_Weld = 55,
   eModifierType_Fluid = 56,
   eModifierType_Simulation = 57,
+  eModifierType_MeshToVolume = 58,
   NUM_MODIFIER_TYPES,
 } ModifierType;
 
@@ -2208,6 +2209,39 @@ typedef struct SimulationModifierData {
   char *data_path;
 } SimulationModifierData;
 
+typedef struct MeshToVolumeModifierData {
+  ModifierData modifier;
+
+  /** This is the object that is supposed to be converted to a volume. */
+  struct Object *object;
+
+  /** MeshToVolumeModifierResolutionMode */
+  int resolution_mode;
+  /** Size of a voxel in object space. */
+  float voxel_size;
+  /** The desired amount of voxels along one axis. The actual amount of voxels might be slightly
+   * different. */
+  int voxel_amount;
+
+  /** If true, every cell in the enclosed volume gets a density. Otherwise, the interior_band_width
+   * is used. */
+  char fill_volume;
+  char _pad1[3];
+
+  /** Band widths are in object space. */
+  float interior_band_width;
+  float exterior_band_width;
+
+  float density;
+  char _pad2[4];
+} MeshToVolumeModifierData;
+
+/* MeshToVolumeModifierData->resolution_mode */
+typedef enum MeshToVolumeModifierResolutionMode {
+  MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_AMOUNT = 0,
+  MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_SIZE = 1,
+} MeshToVolumeModifierResolutionMode;
+
 #ifdef __cplusplus
 }
 #endif