Sculpt: Split normal radius and area radius

This enables an extra layer of control in the sculpt brushes.
For now it is enabled only in Scrape, but it should work in all brushes (like normal radius). In the future it may also be enabled in other brushes.
You can tweak in this property in the scrape brush to achieve a much better behavior when working on curve surfaces and control how much volume you want to trim. In most cases, it also fixes the bug where the brush keeps trimming in the same area without disabling accumulate.
It should be possible to fix some other artifacts in other brushes by tweaking this default property.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D5993

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index 04b6ff55978..42c4e249aae 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -1980,6 +1980,16 @@ static void rna_def_brush(BlenderRNA *brna)
                            "used to sample the normal");
   RNA_def_property_update(prop, 0, "rna_Brush_update");
 
+  prop = RNA_def_property(srna, "area_radius_factor", PROP_FLOAT, PROP_FACTOR);
+  RNA_def_property_float_sdna(prop, NULL, "area_radius_factor");
+  RNA_def_property_range(prop, 0.0f, 2.0f);
+  RNA_def_property_ui_range(prop, 0.0f, 2.0f, 0.001, 3);
+  RNA_def_property_ui_text(prop,
+                           "Area Radius",
+                           "Ratio between the brush radius and the radius that is going to be "
+                           "used to sample the area center");
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
   prop = RNA_def_property(srna, "stencil_pos", PROP_FLOAT, PROP_XYZ);
   RNA_def_property_float_sdna(prop, NULL, "stencil_pos");
   RNA_def_property_array(prop, 2);