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, 9 insertions, 0 deletions

diff --git a/source/blender/editors/transform/transform_convert.c b/source/blender/editors/transform/transform_convert.c
index 14eee2318cd..cbb291414bf 100644
--- a/source/blender/editors/transform/transform_convert.c
+++ b/source/blender/editors/transform/transform_convert.c
@@ -1335,6 +1335,15 @@ bool constraints_list_needinv(TransInfo *t, ListBase *list)
             return true;
           }
         }
+        else if (con->type == CONSTRAINT_TYPE_TRANSLIKE) {
+          /* Copy Transforms constraint only does this in the Before mode. */
+          bTransLikeConstraint *data = (bTransLikeConstraint *)con->data;
+
+          if (ELEM(data->mix_mode, TRANSLIKE_MIX_BEFORE) &&
+              ELEM(t->mode, TFM_ROTATION, TFM_TRANSLATION)) {
+            return true;
+          }
+        }
         else if (con->type == CONSTRAINT_TYPE_TRANSFORM) {
           /* Transform constraint needs it for rotation at least (r.57309),
            * but doing so when translating may also mess things up [#36203]