Sculpt: Dyntopo detail size edit operator

This introduces a new operator to edit the detail size of constant
detail mode in dyntopo. The way this operator works and the
functionality it provides is similar to the "Voxel size edit" operator
for the voxel remesher.

It also includes a sample mode. When pressing Ctrl, the detail size
will be sampled from the surface under the cursor, updating the
preview in real time. This allows quick resolution changes without
using the operator multiple times.

The operator is set to Shift + D, replacing the old way to change
the constant detail size of dyntopo. Shift + R will remain available to
be enabled when the voxel remesher works with dyntopo. Deciding
if both detail sizes can be unified needs a separate discussion as the
new dyntopo can work with detail sizes in parts of the mesh that can
easily crash the remesher.

The structure of these operators is similar, but the data they control,
ranges, drawing and setup functions are completely different, making it
hard to merge them into one.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D9355

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index f7038ed8f7f..bb1d1781e31 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -505,6 +505,9 @@ typedef struct SculptSession {
   int active_face_index;
   int active_grid_index;
 
+  /* When active, the cursor draws with faded colors, indicating that there is an action enabled.
+   */
+  bool draw_faded_cursor;
   float cursor_radius;
   float cursor_location[3];
   float cursor_normal[3];