Sculpt: Enable pen pressure for Scrape/Fill Area Radius

This should improve the issue with Scrape accumulation in concave
surfaces. When the strength of the brush is higher, the area radius is
also bigger, so the scrape plane is more stable preventing it from
accumulating displacement in the same area.
The Scrape/Fill default presets are also updated to include this
functionality.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D8821

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index 5070709cb6d..e6ea79a771a 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -1920,6 +1920,9 @@ static void calc_area_normal_and_center_task_cb(void *__restrict userdata,
     if (ELEM(data->brush->sculpt_tool, SCULPT_TOOL_SCRAPE, SCULPT_TOOL_FILL) &&
         data->brush->area_radius_factor > 0.0f) {
       test_radius *= data->brush->area_radius_factor;
+      if (ss->cache && data->brush->flag2 & BRUSH_AREA_RADIUS_PRESSURE) {
+        test_radius *= ss->cache->pressure;
+      }
     }
     else {
       test_radius *= data->brush->normal_radius_factor;