Geomview For Windows?
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To the software designers
Steve, Thanks for your note about Geomview. Several thoughts come to my mind in response to your question about transparency. First of all, it depends a lot of what kind of machine you're using. On an SGI, it is possible to vary the transparency, via the Materials panel. Click the "Transpancy" button to turn transparency on (for the target object), then move the slider to modify the transparency level. Note however, that it doesn't really work correctly. In order to be correct, Geomview would have to sort the polygons in your picture in screen-depth order on each redraw, which it doesn't do. So sometimes the picture you get with transparency looks really bad. Sometimes, however, particularly if you crank the transparency way up (i.e. almost invisible), it looks OK. We haven't yet implemented transparency for the NeXT or X versions of Geomview. Another thing you might consider, however, is to display an object in wire-frame (turn edges on and faces off) to achieve an effect sort of like transparency. This works with any version of Geomview, and has the advantage of speeding up the drawing time as well (it takes lot less time to draw in wire-frame). You can display some objects solid and some in wire-frame. And finally, if you really want beautiful pictures with perfect transparency, RenderMan (a commerical product from Pixar, Inc.) is the way to go. You can use Geomview to set up the scene the way you want it and to create a RIB file, then use RenderMan to render that file into an image. It's slow --- sometimes taking several minutes to generate a single picture, but the results look great. All this depends, of course, on your having RenderMan, which is rather expensive. If you happen to have it already and would like more information about using it with Geomview, just let me know. Hope this helps, Mark Phillips Geometry Center
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