//! Returns selector for BVH tree, providing a possibility to store information
//! about current view volume and to detect which objects are overlapping it.
- OpenGl_BVHTreeSelector& BVHTreeSelector() { return myBVHSelector; }
+ const OpenGl_BVHTreeSelector& BVHTreeSelector() const { return myBVHSelector; }
//! Returns true if there are immediate structures to display
bool HasImmediateStructures() const