root@fuzzy (Dr. Michael M. Cohen) (04/28/91)
A few questions from a vgx novice... If I've got swapinterval(2), for running on 60Hz console (at 30 frames/sec) should I put swapbuffers(1) when in 30Hz mode for NTSC output? I'm plotting about 1000 polygons (mixed 3&4 point) using bgnpolygon, (...n3f, v3f,...) endpolygon mode. I can do this (just barely) at 30 Hz. How much speedup in drawing time can I expect by using triangular mesh approach? (system is 4D/310-VGX-FX 3.3.2 16Mb) I am computing the vertex normals myself. Can the graphics hardware do this for me? TIA for assistance... MMC
andreess@mrlaxa.mrl.uiuc.edu (Marc Andreessen) (04/28/91)
In article <15121@darkstar.ucsc.edu> mmcohen@fuzzy (Dr. Michael M. Cohen) writes: >How much speedup in drawing time can I expect by using triangular >mesh approach? (system is 4D/310-VGX-FX 3.3.2 16Mb) Quite a bit. I haven't used the vgx, but on PI's and GTX's tmeshes give dramatically better performance (since after the first triangle you're only passing one new vertex per triangle through the pipeline). >I am computing the vertex normals myself. Can the graphics hardware >do this for me? Nope. (Or does the VGX do something new? And if so - or if it could - would it be faster than a fast software algorithm?) Marc -- Marc Andreessen___________University of Illinois Materials Research Laboratory Internet: andreessen@uimrl7.mrl.uiuc.edu____________Bitnet: andreessen@uiucmrl