Copy Transforms: add a mixing mode option.

Allow combining location, rotation and scale at the same time,
using one constraint. The mixing modes are based on matrix
multiplication, but handle scale in a way that avoids creating
shear.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5640

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_constraint_types.h b/source/blender/makesdna/DNA_constraint_types.h
index a7f900ddc9b..d123cf21db9 100644
--- a/source/blender/makesdna/DNA_constraint_types.h
+++ b/source/blender/makesdna/DNA_constraint_types.h
@@ -307,6 +307,8 @@ typedef struct bSameVolumeConstraint {
 /* Copy Transform Constraint */
 typedef struct bTransLikeConstraint {
   struct Object *tar;
+  char mix_mode;
+  char _pad[7];
   /** MAX_ID_NAME-2. */
   char subtarget[64];
 } bTransLikeConstraint;
@@ -790,6 +792,16 @@ typedef enum eCopyScale_Flags {
   SIZELIKE_UNIFORM = (1 << 5),
 } eCopyScale_Flags;
 
+/* bTransLikeConstraint.mix_mode */
+typedef enum eCopyTransforms_MixMode {
+  /* Replace rotation channel values. */
+  TRANSLIKE_MIX_REPLACE = 0,
+  /* Multiply the copied transformation on the left, with anti-shear scale handling. */
+  TRANSLIKE_MIX_BEFORE,
+  /* Multiply the copied transformation on the right, with anti-shear scale handling. */
+  TRANSLIKE_MIX_AFTER,
+} eCopyTransforms_MixMode;
+
 /* bTransformConstraint.to/from */
 typedef enum eTransform_ToFrom {
   TRANS_LOCATION = 0,