Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!wuarchive!psuvax1!rutgers!rochester!cornell!batcomputer!andyrose From: andyrose@batcomputer.tn.cornell.edu (Andy Rose) Newsgroups: comp.graphics.visualization Subject: Re: Biomedical field? Message-ID: <1990Nov8.165118.4648@batcomputer.tn.cornell.edu> Date: 8 Nov 90 16:51:18 GMT References: <1470@vtsai2.sai.vtt.fi> <1990Nov7.193654.7665@batcomputer.tn.cornell.edu> <1990Nov8.020108.11026@ux1.cso.uiuc.edu> Organization: Cornell Theory Center Lines: 38 It would be interesting to know how fast the Next machine (or whatever comes next from Next) will display 3D vectors and shaded polygons. > desperately need back propogation of data in AVS Why? Scientist writes groovy simulation and wants to visualize. I stuff the science into an AVS DATA module so it produces a FIELD. This module is asynchronous and spews data when it can. I then build a network which passes the field data to, say, 'bubble viz' and then to render and then display and finally 'write Wavefront'. All thse modules are synchronous (they execute only when input or parameters change). It takes the Stardent longer to write the image to disk than to generate a new data set so I record every third frame or something like that. Woah... Now I want to let the science module know when I am done writing the frame so it will wait. I try to output an integer from the bottom of the network (the write wavefront module) for input into the science module at the top,which I have now made synchronous (so it will be activated when it sees the integer input from the write module).. AVS bugs out. Call support. No cyclic nets. Woah... Solution: Create TAP module which uses unix sleep call to wait 20 seconds and output an integer asynchronously. This becomes the impetus for the data module to fire. tap->science->geometry->render->write. Kind o' Kludgy. BIG NOTE: apE can apparently handle cyclic nets... Has anyone had experience with apE doing this? OTHER BIG NOTE: avs 3 (demonstrated at SIGGRAPH three months ago) had this worked out. -- Andrew Newkirk Rose '91 Department of Visualization CNSF/Theory Center 632 E & T Building, Hoy Road Ithaca, NY 14583 607 254 8686 andy@cornellf.tn.cornell.edu