fix for issue #39, isosurface not rendering in maingl2
fix for issue #39, isosurface not rendering in maingl2

mhough/braingl,TheProjecter/braingl,mhough/braingl,TheProjecter/braingl,TheProjecter/braingl,braingl/braingl,braingl/braingl,mhough/braingl,braingl/braingl