Volumes: new Volume Displace modifier

This modifier uses a 3D texture to displace a volume.
For now, this can only use the previously existing texture system,
because we do not have a better alternative yet. Still, the results
can be quite good and interesting. See D9075 for some examples.

Reviewers: brecht, simonthommes

Differential Revision: https://developer.blender.org/D9075

1 files changed, 20 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index fa2f54c7aa0..3a3aa106dc0 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -96,6 +96,7 @@ typedef enum ModifierType {
   eModifierType_Fluid = 56,
   eModifierType_Simulation = 57,
   eModifierType_MeshToVolume = 58,
+  eModifierType_VolumeDisplace = 59,
   NUM_MODIFIER_TYPES,
 } ModifierType;
 
@@ -2255,6 +2256,25 @@ typedef enum MeshToVolumeModifierResolutionMode {
   MESH_TO_VOLUME_RESOLUTION_MODE_VOXEL_SIZE = 1,
 } MeshToVolumeModifierResolutionMode;
 
+typedef struct VolumeDisplaceModifierData {
+  ModifierData modifier;
+
+  struct Tex *texture;
+  struct Object *texture_map_object;
+  int texture_map_mode;
+
+  float strength;
+  float texture_mid_level[3];
+  float texture_sample_radius;
+} VolumeDisplaceModifierData;
+
+/* VolumeDisplaceModifierData->texture_map_mode */
+enum {
+  MOD_VOLUME_DISPLACE_MAP_LOCAL = 0,
+  MOD_VOLUME_DISPLACE_MAP_GLOBAL = 1,
+  MOD_VOLUME_DISPLACE_MAP_OBJECT = 2,
+};
+
 #ifdef __cplusplus
 }
 #endif