im using opengl, and when i use to this to zoom in, its sloppy case ''z'': //zoom in glOrtho(xmin-.1, xmax+.1, ymin-.1, ymax+.1, zmin-.1, zmax+.1); glutPostRedisplay(); break; could it be that i have so many lines, when it zooms in it has to redraw all of them?

oops, i had that backwords, it zoom out, and not zoom in