Rulers are no longer used. Instead, the XYZ reference axes has been changed such that the length of the axes can be set by the user and the reference axes appear in the lower left corner of the viewing area and rotate with the accelerator. This way, the user gets a better idea of the current orientation and length scale. Labels have been modified to make use of the six GLUT fonts. Up to 20 may be drawn, and holding the Shift key while right-clicking on a label allows the user to edit an old label.
Lighting is on by default.
This has been removed in favour of making use of the GL Utilities to draw some of the primitives, ensuring maximum efficiency. Printing no longer captures the screen in RGB format, rather it uses the more efficient TIFF format to write the viewing area to a file. Postscript conversion is accomplished in the same manner as it was in 3.2, but using the tiff2ps utility instead of tops . Labels are NOT restored. Mouse actions were changed.