Curves: support sculpting on deformed curves

Previously, curves sculpt tools only worked on original data. This was
very limiting, because one could effectively only sculpt the curves when
all procedural effects were turned off. This patch adds support for curves
sculpting while looking the result of procedural effects (like deformation
based on the surface mesh). This functionality is also known as "crazy space"
support in Blender.

For more details see D15407.

Differential Revision: https://developer.blender.org/D15407

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/nodes/NOD_geometry_exec.hh b/source/blender/nodes/NOD_geometry_exec.hh
index 0d5ba6cf5db..c5bc42b059d 100644
--- a/source/blender/nodes/NOD_geometry_exec.hh
+++ b/source/blender/nodes/NOD_geometry_exec.hh
@@ -163,6 +163,7 @@ class GeoNodeExecParams {
   }
 
   void check_input_geometry_set(StringRef identifier, const GeometrySet &geometry_set) const;
+  void check_output_geometry_set(const GeometrySet &geometry_set) const;
 
   /**
    * Get input as vector for multi input socket with the given identifier.
@@ -231,6 +232,9 @@ class GeoNodeExecParams {
 #ifdef DEBUG
       this->check_output_access(identifier, type);
 #endif
+      if constexpr (std::is_same_v<StoredT, GeometrySet>) {
+        this->check_output_geometry_set(value);
+      }
       GMutablePointer gvalue = provider_->alloc_output_value(type);
       new (gvalue.get()) StoredT(std::forward<T>(value));
       provider_->set_output(identifier, gvalue);