Hi Olivier, I think there are example scenes for strand collision that ship with XSI. No friction between strands and geo is modeled as far as I can remember, but it might get you started.
Then there is also the strand collision framework for more accurate collisions, but I don't know how it reacts to changing point counts and strand length: http://softimage.tv/strand-collision-framework/ PS: If the runners trails are meant as a graphical element rather than an actual physical element in your picture I doubt I will look nice when it collides with the runner. Maybe you could solve this in comp and get around explaining collisions entirely? Here is a nice example in a recent Glassworks spot that might be similar to what you to try to achieve: http://softimage.tv/lycra-moves-you/ Good luck, Stefan
Hello, long time reader, first time poster here! So I have a bit of a problem on my hands. We are doing a very simple concept, a sportsman whose back is leaving strand trails as he goes. This is child's play so far. My issue is that we would like the trails to interact with the mesh when, for various reasons, he cuts through them again. IE : at some point he falls to the ground and stands back up. The unwanted behaviour is that the strands generated from the back of his head will >simply go through his head as he rises up, resulting in a somehow vertical strands column masking his face and fore-body. The desired behaviour >is that the strands will flow around his cranium, maybe along his back, effectively leaving at least his face apparent. Animation is done in Maya and transfered over via geocache. I tried to operate with tools like 'closest location' or 'get location by raycast' applied to the strandpositions when inside the volume to simulate >collision, but these were all lacking. The raycast solution may be promising, but I don't know how to set the correct direction vector. And >sometimes the animation I'm working with may "skip" a strandposition, effectively not triggering the 'inside volume' condition. So yeah basically I don't know how to do that in a visually pleasing way. If anyone had some pointers, I'd be very grateful ! Thanks, Olivier
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