   Register Combiners without NVParse
  I am trying to do bumbp mapping using register combiners without using NVParse at the moment the program generates a segmentation fault when if reaches the lineglCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, 2);could anyone make some sugestions why this would happen?i am working on linux with a GeForce 4 MX 440 with 128 meg of video memorycheersDave 
  Have you gotten a function pointer for glCombinerParameteriNV using glXGetProcAddressARB? ;  having checked my code. The line that gets the function pointer using the glXGetProcAddressARB, returns NULL when i compile using g++, with my C++ code. However if rewrite my code in C and i compile using gcc, it works fine. Unfortunatly i need to be able to do this in C++. Thanks againDave  