Sculpt: Scale Cloth Filter

This filter scales the mesh as it was a softbody, producing folds in the
surface. The orientation of the folds can be controlled using the filter
axis and orientation.

This is an example of a cloth filter that uses deform coordinates instead
of forces, but probably it does not make much sense to expose it to the
user in a different way and with different parameters. I'll remove
FilterCache->enabled_force_axis in a later commit and use always
enabled_axis in SCULPT_filter_zero_disabled_axis_components
for both forces and deformation filters, so this function can also be used
in the mesh filter.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D8661

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c b/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c
index 1cbf9275a56..c2e90638994 100644
--- a/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c
+++ b/source/blender/editors/sculpt_paint/sculpt_filter_mesh.c
@@ -97,6 +97,17 @@ void SCULPT_filter_to_object_space(float r_v[3], struct FilterCache *filter_cach
   }
 }
 
+void SCULPT_filter_zero_disabled_axis_components(float r_v[3], struct FilterCache *filter_cache)
+{
+  SCULPT_filter_to_orientation_space(r_v, filter_cache);
+  for (int axis = 0; axis < 3; axis++) {
+    if (!filter_cache->enabled_force_axis[axis]) {
+      r_v[axis] = 0.0f;
+    }
+  }
+  SCULPT_filter_to_object_space(r_v, filter_cache);
+}
+
 static void filter_cache_init_task_cb(void *__restrict userdata,
                                       const int i,
                                       const TaskParallelTLS *__restrict UNUSED(tls))