[Bf-blender-cvs] [2be7b2aaf9c] geometry-nodes: Geometry Nodes: better handle link cycles

[Jacques Lucke]

Commit: 2be7b2aaf9c9179686320c683942dc6deec85c1c
Author: Jacques Lucke
Date:   Thu Nov 12 12:58:27 2020 +0100
Branches: geometry-nodes
https://developer.blender.org/rB2be7b2aaf9c9179686320c683942dc6deec85c1c

Geometry Nodes: better handle link cycles

===================================================================

M	source/blender/modifiers/intern/MOD_nodes.cc

===================================================================

diff --git a/source/blender/modifiers/intern/MOD_nodes.cc b/source/blender/modifiers/intern/MOD_nodes.cc
index 4aa17936caa..1791ab1fcc6 100644
--- a/source/blender/modifiers/intern/MOD_nodes.cc
+++ b/source/blender/modifiers/intern/MOD_nodes.cc
@@ -814,6 +814,11 @@ static GeometrySetPtr modifyGeometry(ModifierData *md,
   NodeTreeRefMap tree_refs;
   DerivedNodeTree tree{nmd->node_group, tree_refs};
 
+  if (tree.has_link_cycles()) {
+    BKE_modifier_set_error(ctx->object, md, "Node group has cycles");
+    return input_geometry_set;
+  }
+
   Span<const DNode *> input_nodes = tree.nodes_by_type("NodeGroupInput");
   Span<const DNode *> output_nodes = tree.nodes_by_type("NodeGroupOutput");