pbarua Posted March 4, 2013 Share Posted March 4, 2013 I have a animated sphere which is transferring Cd to a grid. To get trail of color, I used CHOP. I got trail but that is static. I want to spread that trail over time like attached reference MOV. I attached hip which I got so far. attribute_spread.hipnc reference.mov Quote Link to comment Share on other sites More sharing options...
Nerox Posted March 4, 2013 Share Posted March 4, 2013 Hi, Run your grid through a solver SOP. Connect your grid to the first input, and your animated sphere in the second. Inside add your attribute transfer and connect the left most input to the first input of the attribute transfer and the 3 node (which is de sec on the top level) to the second of your attribute transfer. Jump one level up rewind and magic! ;-) Good luck, Quote Link to comment Share on other sites More sharing options...
Annon Posted March 4, 2013 Share Posted March 4, 2013 (edited) Here's a simple scene with what you want. It's in a dopnet, but you could easily take the stuff that's inside the sop solver in there and put it into the geometry solver at sop level (just called "solver" I believe). It's the same thing, just set's up the dopnet for you and doesn't need a Master license. It's just from my library of little tricks I have in case I need something fast, so I haven't had a look at it in a while, but I think it preserves groups and colours based on the group. So you'll want to transfer attribute and then take the max of the result from the transfer attribute and the last frame. C SOPDOP_preserveGroup.hip Edited March 4, 2013 by ChristianW Quote Link to comment Share on other sites More sharing options...
pbarua Posted March 4, 2013 Author Share Posted March 4, 2013 @Nerox this is same as I got using CHOPs. I want to spread the trail. please check my file. Quote Link to comment Share on other sites More sharing options...
Annon Posted March 4, 2013 Share Posted March 4, 2013 Sorry i forgot to add the hip (or attach it anyway). Don't use chops, use sopsolver... Quote Link to comment Share on other sites More sharing options...
pbarua Posted March 4, 2013 Author Share Posted March 4, 2013 Hi, Christian and Nick thanx for your reply but that is not what I'm looking for. please check mov. refference_new.mov Quote Link to comment Share on other sites More sharing options...
Annon Posted March 4, 2013 Share Posted March 4, 2013 Well yeah but you could get that with the techniques we've given you. You want it to blur out. So use the attributeTransferSOP in the sop solver to get the blur. you could then transfer each step back onto itself to get it to blur out more and more. Quote Link to comment Share on other sites More sharing options...
pbarua Posted March 11, 2013 Author Share Posted March 11, 2013 (edited) Finally I did it. I used point cloud open VOP. I find the trick in a handy example which comes with Houdini. spreading_attribute_over_time.hip Edited March 11, 2013 by Pradeep Barua 1 Quote Link to comment Share on other sites More sharing options...
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