Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
I've got a set of polygons describing a 3D surface. I can render the surface (in PV-WAVE) using POLYSHADE(verts,polys), but what I want to do is plot a projection of that image onto a 2D plot using POLYFILL. This will allow me to: a) output the "image" as PostScript polygons, rather than as a bitmap b) plot various 2D things on top of it c) control the projection aspect ratio without driving myself crazy trying to make T3D do what I want. I can easily compute the projection of each polygon onto my 2D coordinate system and devise a sensible coloring scheme, but in order to use POLYFILL, I need to know in what order to plot the polygons to reproduce the hidden-line removal that POLYSHADE uses. Any advice greatly appreciated! -- Ewan Macpherson <emacpher@umich.edu> Central Systems Laboratory Kresge Hearing Research Institute http://www-personal.umich.edu/~emacpher