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zooming

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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?

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