Geometry Nodes: Add mesh input warning to curve to mesh node

A point of confusion about this node is that it doesn't work on the
output of the mesh circle primitive node. This patch adds a warning to
help with that. This avoids adding a warning when the geometry set
input has no mesh.

Differential Revision: https://developer.blender.org/D11771

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc b/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc
index c0d817385e2..159c4fffb57 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc
@@ -337,7 +337,17 @@ static void geo_node_curve_to_mesh_exec(GeoNodeExecParams params)
   curve_set = bke::geometry_set_realize_instances(curve_set);
   profile_set = bke::geometry_set_realize_instances(profile_set);
 
+  /* Note: Theoretically an "is empty" check would be more correct for errors. */
+  if (profile_set.has_mesh() && !profile_set.has_curve()) {
+    params.error_message_add(NodeWarningType::Warning,
+                             TIP_("No curve data available in profile input"));
+  }
+
   if (!curve_set.has_curve()) {
+    if (curve_set.has_mesh()) {
+      params.error_message_add(NodeWarningType::Warning,
+                               TIP_("No curve data available in curve input"));
+    }
     params.set_output("Mesh", GeometrySet());
     return;
   }