Curves: support symmetry in curves sculpting brushes

This adds support for X/Y/Z symmetry for all brushes in curves
sculpt mode. In theory this can be extended to support radial
symmetry, but that's not part of this patch.

It works by essentially applying a brush stroke multiple with
different transforms. This is similiar to how symmetry works in
mesh sculpt mode, but is quite different from how it worked in
the old hair system (there it tried to find matching hair strands
on both sides of the surface; if none was found, symmetry did
not work).

Differential Revision: https://developer.blender.org/D14795

1 files changed, 32 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_ui/space_view3d_toolbar.py b/release/scripts/startup/bl_ui/space_view3d_toolbar.py
index 8c3215abc36..ba02bfb4082 100644
--- a/release/scripts/startup/bl_ui/space_view3d_toolbar.py
+++ b/release/scripts/startup/bl_ui/space_view3d_toolbar.py
@@ -1048,6 +1048,35 @@ class VIEW3D_PT_sculpt_symmetry_for_topbar(Panel):
 
     draw = VIEW3D_PT_sculpt_symmetry.draw
 
+class VIEW3D_PT_curves_sculpt_symmetry(Panel, View3DPaintPanel):
+    bl_context = ".curves_sculpt"  # dot on purpose (access from topbar)
+    bl_label = "Symmetry"
+    bl_options = {'DEFAULT_CLOSED'}
+
+    @classmethod
+    def poll(cls, context):
+        return context.object and context.object.type == 'CURVES'
+
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False
+
+        curves = context.object.data
+
+        row = layout.row(align=True, heading="Mirror")
+        row.prop(curves, "use_mirror_x", text="X", toggle=True)
+        row.prop(curves, "use_mirror_y", text="Y", toggle=True)
+        row.prop(curves, "use_mirror_z", text="Z", toggle=True)
+
+class VIEW3D_PT_curves_sculpt_symmetry_for_topbar(Panel):
+    bl_space_type = 'TOPBAR'
+    bl_region_type = 'HEADER'
+    bl_label = "Symmetry"
+
+    draw = VIEW3D_PT_curves_sculpt_symmetry.draw
+
+
 
 # ********** default tools for weight-paint ****************
 
@@ -2351,6 +2380,9 @@ classes = (
     VIEW3D_PT_sculpt_options,
     VIEW3D_PT_sculpt_options_gravity,
 
+    VIEW3D_PT_curves_sculpt_symmetry,
+    VIEW3D_PT_curves_sculpt_symmetry_for_topbar,
+
     VIEW3D_PT_tools_weightpaint_symmetry,
     VIEW3D_PT_tools_weightpaint_symmetry_for_topbar,
     VIEW3D_PT_tools_weightpaint_options,