Fixed PolyLine collection color update

ObjectTypes/PolyLine/PolyLineT.cc

@@ -2276,7 +2276,7 @@ void PolyLineT<PointT>::
     unsigned int offset = p->prop_size * _i;
 
     // check out of range
-    if (offset + p->prop_size >= p->prop_data.size()) {
+    if (offset + p->prop_size > p->prop_data.size()) {
       std::cerr << "PolyLineT::get_custom_property - out of range access" << std::endl;
       return;
     }

ObjectTypes/PolyLineCollection/PolyLineCollectionNodeT.hh

@@ -118,6 +118,7 @@ public:
 
   /// Trigger an update of the vbo
   void update() { updateVBO_ = true; };
+  void resetVBO() {offsets_.clear();}
 
 private:
 

ObjectTypes/PolyLineCollection/PolyLineCollectionObject.cc

@@ -203,6 +203,10 @@ PolyLineCollection* PolyLineCollectionObject::collection() {
 
 
 void PolyLineCollectionObject::update(UpdateType _type) {
+  if(_type == UPDATE_COLOR || _type == UPDATE_ALL){
+      collectionNode_->resetVBO();
+  }
+
   collectionNode_->update();
 }