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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Update REQ 5912]: occlusion points
> Is there a way to read off the visible points of an object for > different views? Not directly; geomview uses Z-buffering, which lets the graphics system decide for each pixel whether it's closer than any other graphical item, and doesn't explicitly record which vertices are visible. However, you could use geomview's "pick" facility. You'd interactively click on the points you can see, and geomview can provide their coordinates. This might be tolerable if you don't have too many of them. You'd feed geomview a command like: (interest (pick world)) or (interest (pick primitive)) (where the keyword following "pick" indicates the coordinate system in which you'd like the data to be returned). Geomview would emit pick results whenever you clicked the rightmost mouse button. There are examples of interpreting this in the manual. If you say more about the context you'd like to use this in, I could explain further.
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