// react to keys void keyboard(unsigned char k, int OSG_CHECK_ARG(x), int OSG_CHECK_ARG(y)) { switch(k) { case 27: { OSG::osgExit(); exit(0); } break; case 'a': { OSG::beginEditCP(vol, OSG::DVRVolume::SamplingFieldMask); vol->setSampling(vol->getSampling() * 1.1); OSG::endEditCP(vol, OSG::DVRVolume::SamplingFieldMask); std::cout << "Sampling set to " << vol->getSampling() << std::endl; glutPostRedisplay(); } break; case 'z': { OSG::beginEditCP(vol, OSG::DVRVolume::SamplingFieldMask); vol->setSampling(vol->getSampling() * 0.9); OSG::endEditCP(vol, OSG::DVRVolume::SamplingFieldMask); std::cout << "Sampling set to " << vol->getSampling() << std::endl; glutPostRedisplay(); } break; } }