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After several bodies describing a geometry model have been defined, Sabrina requires the following information for producing a line drawing with DRAW or RD:
The defaults for these items are sufficient in nearly all cases. The default draw set is everything. Unless dimensions of the bodies are greater than several thousand, the default viewpoint [(X, Y, Z) = (4500, 5500, 5000)] and window can be used. The default first spatial window is from -9000 to +9000 in all three directions. The plot resolution is initially set to 80 points maximum for both straight and curved lines.
The default line drawing mode is to show all surface intersections. The computation of the intersections is controlled by the SCAN setting. When SCAN is OFF, the intersections are not shown. For very complicated models, where many intersections are expected, Sabrina will revert to the SCAN OFF mode. (The intersection calculations are also skipped when the line drawing algorithms are used to determine the scaling for a ray-traced picture.)
Body geometry may be drawn without the existence of cell descriptions. This ability permits the orientation of the bodies and the relationships among the bodies to be displayed before cell descriptions are made. The cell description is used in line drawing only when the TRACE mode is ON for hidden line removal.