fixed a bug, where certain Collada files caused an assertion

git-svn-id: http://svn.code.sf.net/p/simox/code/trunk@694 042f3d55-54a8-47e9-b7fb-15903f145c44

VirtualRobot/Import/COLLADA-light/inventor.cpp

@@ -53,9 +53,12 @@ void addTransform(SoGroup* root, pugi::xml_node node){
     }
 }
 
-InventorRobotNode::InventorRobotNode(){}
+InventorRobotNode::InventorRobotNode(){
+    m_bOwn=false;
+}
 
 InventorRobotNode::InventorRobotNode(SoSeparator *_root){
+    m_bOwn=true;
     visualization = new SoSeparator;
     visualization->ref();
     preJointTransformation = new SoGroup;
@@ -66,8 +69,10 @@ InventorRobotNode::InventorRobotNode(SoSeparator *_root){
 }
 
 InventorRobotNode::~InventorRobotNode(){
-    visualization->unref();
-    collisionModel->unref();
+    if (m_bOwn) {
+        visualization->unref();
+        collisionModel->unref();
+    }
 }
 
 void InventorRobotNode::visualizeBoundingBox()

VirtualRobot/Import/COLLADA-light/inventor.h

@@ -15,6 +15,8 @@ namespace Collada {
         ~InventorRobotNode();
         void visualizeBoundingBox();
         virtual void initialize();
+    private:
+        bool m_bOwn;
     };
 
     // Adds a <instance_geometry_node> directly to a SoSeparator.