From e2b3ff502417df4fb7237e0090dcd2f5564e35da Mon Sep 17 00:00:00 2001
From: Nathan Letwory <nathan@letworyinteractive.com>
Date: Tue, 16 Nov 2010 22:27:31 +0000
Subject: [PATCH] Apply patch [#24722] COLLADA exporter: handle instancing
 Submitted by Wenzel Jakob

Patch adds handling of linked meshes: instead of generating separate geometry objects, use instances.
---
 source/blender/collada/GeometryExporter.cpp | 5 +++++
 source/blender/collada/GeometryExporter.h   | 3 +++
 source/blender/collada/collada_internal.cpp | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/source/blender/collada/GeometryExporter.cpp b/source/blender/collada/GeometryExporter.cpp
index 1aef6e6489a..7b5b5397955 100644
--- a/source/blender/collada/GeometryExporter.cpp
+++ b/source/blender/collada/GeometryExporter.cpp
@@ -63,6 +63,11 @@ void GeometryExporter::operator()(Object *ob)
 	std::vector<Normal> nor;
 	std::vector<Face> norind;
 
+	// Skip if linked geometry was already exported from another reference
+	if (exportedGeometry.find(geom_id) != exportedGeometry.end())
+		return;
+	exportedGeometry.insert(geom_id);
+
 	bool has_color = (bool)CustomData_has_layer(&me->fdata, CD_MCOL);
 
 	create_normals(nor, norind, me);
diff --git a/source/blender/collada/GeometryExporter.h b/source/blender/collada/GeometryExporter.h
index 7a78b676f49..27c837418b1 100644
--- a/source/blender/collada/GeometryExporter.h
+++ b/source/blender/collada/GeometryExporter.h
@@ -28,6 +28,7 @@
 
 #include <string>
 #include <vector>
+#include <set>
 
 #include "COLLADASWStreamWriter.h"
 #include "COLLADASWLibraryGeometries.h"
@@ -89,6 +90,8 @@ public:
 	COLLADASW::URI makeUrl(std::string id);
 	
 	/* int getTriCount(MFace *faces, int totface);*/
+private:
+	std::set<std::string> exportedGeometry;
 };
 
 struct GeometryFunctor {
diff --git a/source/blender/collada/collada_internal.cpp b/source/blender/collada/collada_internal.cpp
index 6f401c1856f..4943aa96546 100644
--- a/source/blender/collada/collada_internal.cpp
+++ b/source/blender/collada/collada_internal.cpp
@@ -247,7 +247,7 @@ std::string id_name(void *id)
 
 std::string get_geometry_id(Object *ob)
 {
-	return translate_id(id_name(ob)) + "-mesh";
+	return translate_id(id_name(ob->data)) + "-mesh";
 }
 
 std::string get_light_id(Object *ob)