Stremik Posted July 1, 2002 Share Posted July 1, 2002 I was wondering! Has anybody ever tried to cheat cloth simulation in Houdini with help of VEX? Quote Link to comment Share on other sites More sharing options...
freespark Posted July 2, 2002 Share Posted July 2, 2002 Hello Stremik, Just out of curiousity, do you mean for the surface shaders displacements or do you mean just simulating dynamics like pleats, folding, waving etc.? Nevins Quote Link to comment Share on other sites More sharing options...
Stremik Posted July 2, 2002 Author Share Posted July 2, 2002 I meant dynamics, but just now I've realised that would mean to write full featured cloth simulation plug-in with all the features like friction, elastisity, prevention of self intrsection,interaction with other objects and forces like wind, gravity etc.TO MUCH HASSLE!I'm not even shure if VEX is the right tool to do that. Quote Link to comment Share on other sites More sharing options...
Jason Posted July 2, 2002 Share Posted July 2, 2002 Without a doubt you could get some kind of flappy material using VEX. You could varying the effect of the flapping by some attribute you could paint on with the Paint SOP. I've never done it, but a flapping shirt or something may be easy enough. True cloth sim could never be done in VEX Some kind of noise displacement projected along a wind vector combined with ripples could make a nice shirt flapping, perhaps. That'd be a challenge! Later, The Kind Tapir Quote Link to comment Share on other sites More sharing options...
MG Posted July 24, 2002 Share Posted July 24, 2002 Without a doubt you could get some kind of flappy material using VEX. You could varying the effect of the flapping by some attribute you could paint on with the Paint SOP. I've never done it, but a flapping shirt or something may be easy enough. True cloth sim could never be done in VEX Some kind of noise displacement projected along a wind vector combined with ripples could make a nice shirt flapping, perhaps. That'd be a challenge! Later, The Kind Tapir VEX isn't capable of it? Isn't there another method of acchieving this in Houdini? Anyways, will Houdini 5.5 feature cloth simulation? Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted July 24, 2002 Share Posted July 24, 2002 Anyways, will Houdini 5.5 feature cloth simulation? No. But you get VOPs, tho. VOP is REALLY AWESOME (if you know VEX)!! Quote Link to comment Share on other sites More sharing options...
MG Posted July 24, 2002 Share Posted July 24, 2002 Anyways, will Houdini 5.5 feature cloth simulation? No. But you get VOPs, tho. VOP is REALLY AWESOME (if you know VEX)!! Heh, well actually I am still in the process of learning Houdini (including VEX). So far, I must say, I really like it! Houdini is a truly amazing program. Oh and, what does VOP stand for? Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted July 24, 2002 Share Posted July 24, 2002 It has a cool name: Vector OPerators. Quote Link to comment Share on other sites More sharing options...
stevenong Posted July 25, 2002 Share Posted July 25, 2002 It's Vex OPerator instead of Vector OPerator. Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted July 25, 2002 Share Posted July 25, 2002 whooosydaisy. How did I got "Vector OPerators" into my head. Or may be I've been chanting a bit too many "vectors" recently. Vector math, vector3, vector4, vector product, vector vector vector. Quote Link to comment Share on other sites More sharing options...
danteA Posted July 27, 2002 Share Posted July 27, 2002 Here's a cheat that may work depending on exactly what you want: http://mailarchivers.ncsa.uiuc.edu/cgi-bin...archive=HOUDINI dante Quote Link to comment Share on other sites More sharing options...
MG Posted July 31, 2002 Share Posted July 31, 2002 And what is so revolutionary/new about VOP? Could someone tell me, since I am still quite new with Houdini and all. Quote Link to comment Share on other sites More sharing options...
danteA Posted July 31, 2002 Share Posted July 31, 2002 I don't think it's revolutionary but it's definitely cool. You're not limited to shaders with VOPs, you can use VOPS to write SOPs, POPs, COPs, CHOPs, etc. So by just looking at using VOPs to write a VEX SOP, I haven't seen anybody else offer a graphical node-based approach to creating your own custom geometry modifier without scripting. I may be wrong but same goes for particle modifiers, pixel modifiers, channel modifiers, etc. Quote Link to comment Share on other sites More sharing options...
MG Posted July 31, 2002 Share Posted July 31, 2002 I don't think it's revolutionary but it's definitely cool. You're not limited to shaders with VOPs, you can use VOPS to write SOPs, POPs, COPs, CHOPs, etc.So by just looking at using VOPs to write a VEX SOP, I haven't seen anybody else offer a graphical node-based approach to creating your own custom geometry modifier without scripting. I may be wrong but same goes for particle modifiers, pixel modifiers, channel modifiers, etc. Oh, I see now. (Actually, it's just what I suspected you could do with VOPs.) And will it make you able to control operators, parameters (etc.) with colors, ramps, textures (etc.), just like in Maya? Quote Link to comment Share on other sites More sharing options...
mike Posted August 1, 2002 Share Posted August 1, 2002 You can do a lot more than in Maya, because you are not limited in only using predefined "building blocks". As an example for COP's , you are able to make all "photoshop-layer-functions" like screen, overlay, burn .... in about minutes. Quote Link to comment Share on other sites More sharing options...
Jason Posted August 1, 2002 Share Posted August 1, 2002 Thats right! Actually it'd be great if someone wrote a complete "photoshop compositing op" in VOPs for everyone.. I thought of doing this but I just don't have the time lately. Anyone up to it? There is an article explaining the math for you too. Over here! Quote Link to comment Share on other sites More sharing options...
MG Posted August 1, 2002 Share Posted August 1, 2002 I am yet again impressed! This is great news and I can't wait to try it all out. Quote Link to comment Share on other sites More sharing options...
MG Posted August 1, 2002 Share Posted August 1, 2002 Thats right!Actually it'd be great if someone wrote a complete "photoshop compositing op" in VOPs for everyone.. I thought of doing this but I just don't have the time lately. Anyone up to it? There is an article explaining the math for you too. Over here! Great tips! I also love that site. So thanks for sharing! Pity though they didn't cover the dodge and burn Photoshop layer fuctions. (Probably because they are more complex). Quote Link to comment Share on other sites More sharing options...
danteA Posted August 1, 2002 Share Posted August 1, 2002 I seem to recall reading about what the dodge & burn functions did in some photoshop book. Quote Link to comment Share on other sites More sharing options...
MG Posted August 1, 2002 Share Posted August 1, 2002 I seem to recall reading about what the dodge & burn functions did in some photoshop book. I understand what the actual blending (transfer) modes do. But I just don't know, or knew, the math behind it. Now I do, except of the dodge and burn blending modes, which aren't described on the page of Jason's link. Quote Link to comment Share on other sites More sharing options...
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