Hash Fellow robcat2075 Posted March 20, 2012 Hash Fellow Posted March 20, 2012 I've found a case where running a simCloth simulation while looking in the Camera view is a problem. A simulation that would run in a reasonable time if I started it from a Birdseye view would get bogged down with many tens of thousands of "collisions" (see lower left corner of the screen shot) to try to solve if I started it in the camera view. My experience is that anything more than a few hundred collisions is a sign of a simulation going bad and 30,000 is pretty much crazy stuff that has gone off the rails and will never finish properly. For simple situations like "Wave the Flag" I don't think Camera View will be an issue, and if you have created some genuinely unsolvable circumstance in your model or animation, BirdsEye view wont' save you, but just be aware that Camera view may not be ideal while running simulations. Quote
Gerry Posted March 21, 2012 Posted March 21, 2012 That's interesting. It would never have occurred to me that it was the camera view! I was having trouble with a cloth sim a couple weeks ago that I may go back and try again, just to see. Quote
Gerry Posted March 21, 2012 Posted March 21, 2012 Dang that's an incredible find Robert! I just re-tried a test for Biff's cape that I'd given up on. Check this out, it's behaving beautifully. I did try putting a path constraint on Biff so he could walk over a distance, but the cloth got wonky almost immediately. So here he's walking in place. But it would be a cinch to do the sim, then put him on a path if I wanted. Did you just stumble across this! Biff_WalkCapeTest_h264.mov Quote
John Bigboote Posted March 21, 2012 Posted March 21, 2012 So is top view(5) better than other orthogonal views? What about if you put the camera out of perspective and into orthogonal?... might help to diagnose if perspective is the culprit. Quote
Gerry Posted March 21, 2012 Posted March 21, 2012 I did mine in a (4) side view and it went like butter. Quote
Hash Fellow robcat2075 Posted March 21, 2012 Author Hash Fellow Posted March 21, 2012 That looks real good Gerry. In my test case the birdseye view was still a perspective view so I'm not sure that perspective vs. non is the issue but perhaps it also is. In further testing I'm beginning to think that different birdseye views may have more or less success but that's hard to confirm since birdseye views can't be saved and reused. I found this because I had an old project aht worked in v16 and was going to add some more cloth, but now in v17. But that didnt' work, and even just the original cloth wouldn't work so figured it must be a new v17 bug and went back to v16. But it didn't work in v16 now, even though it had worked before! Eventually I just happened to run a simulation after I had turned out of the Camera view and that whizzed right through. A-ha! However, I still haven't got my new added cloth to work yet. Quote
Gerry Posted March 21, 2012 Posted March 21, 2012 It's a good find, but it would be *nice* to know the ins and outs and what-have-yous. However I believe I'll be going back to the cloth material for this cape; I'd switched to a series of bones with dynamic contstraints, which works okay, but there's a lot of tweaking with the cp weighting and it was never 100% though I had planned to work with it further. I might have two models for this character and use on a case-by-case basis. Not every shot he's in needs a waving cape anyway. EDIT: I do have a cloth question though: if a character appears in a shot at say, frame 320, is there a way to start the cloth sim at that frame instead of zero? Guess I should go test. Quote
Hash Fellow robcat2075 Posted March 21, 2012 Author Hash Fellow Posted March 21, 2012 EDIT: I do have a cloth question though: if a character appears in a shot at say, frame 320, is there a way to start the cloth sim at that frame instead of zero? Guess I should go test. In the Choreography properties, under plugins, there is a Simcloth option to turn "Use Chor Length" OFF and set a start and end time. Quote
mtpeak2 Posted March 21, 2012 Posted March 21, 2012 I though simulations needed to in a front view? Or is that just dynamics? Quote
Hash Fellow robcat2075 Posted March 21, 2012 Author Hash Fellow Posted March 21, 2012 I though simulations needed to in a front view? Or is that just dynamics? I remember Martin once saying dynamics had to be simulated from the front view, but I couldn't find that it made things any better when i tried it. If any one can find more on that I'd be eager to read more about it. Quote
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