Sculpt: Clay Strips Tip Roundness property

This patch allow to change the brush tip shape between a square and a
circle using a brush property.

After this change we are no longer testing the distance against a cube
(the Z axis is not used). I did not test this in depth, but if it does
not produce any artifacts I think we can keep it this way instead of
adding more complexity to the code.

In this new distance test the brush falloff is only applied on the
rounded parts of the square to avoid sharp artifacts in the
diagonals. Because of this, the round version is much softer than
the square one. The planned hardness property will fix this, but
this can also be avoided by setting the fallof to a custom curve.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6165

1 files changed, 4 insertions, 1 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt_intern.h b/source/blender/editors/sculpt_paint/sculpt_intern.h
index 0b5bb942032..9d1795dec8f 100644
--- a/source/blender/editors/sculpt_paint/sculpt_intern.h
+++ b/source/blender/editors/sculpt_paint/sculpt_intern.h
@@ -280,7 +280,10 @@ void sculpt_brush_test_init(struct SculptSession *ss, SculptBrushTest *test);
 bool sculpt_brush_test_sphere(SculptBrushTest *test, const float co[3]);
 bool sculpt_brush_test_sphere_sq(SculptBrushTest *test, const float co[3]);
 bool sculpt_brush_test_sphere_fast(const SculptBrushTest *test, const float co[3]);
-bool sculpt_brush_test_cube(SculptBrushTest *test, const float co[3], float local[4][4]);
+bool sculpt_brush_test_cube(SculptBrushTest *test,
+                            const float co[3],
+                            float local[4][4],
+                            const float roundness);
 bool sculpt_brush_test_circle_sq(SculptBrushTest *test, const float co[3]);
 bool sculpt_search_sphere_cb(PBVHNode *node, void *data_v);
 bool sculpt_search_circle_cb(PBVHNode *node, void *data_v);