TheDrop Posted November 26, 2014 Share Posted November 26, 2014 Hi all,I simulated snow above my Torus.I've created a vector (0,1,0), and then I calculate the dot product between my vector and normal.More than 0.4 snow, less than 0.4 no snow.But I wouldn't like the snow when my Tourus is at 90 degrees, or when the top of the Torus cover the hole of the Torus.How can I think to do that?I am attaching two photos to make you understand better (I hope :-) )Thanks! Quote Link to comment Share on other sites More sharing options...
Skybar Posted November 26, 2014 Share Posted November 26, 2014 Send a ray (Ray SOP or Intersect VOP) and see if anything is above it. Quote Link to comment Share on other sites More sharing options...
loopyllama Posted November 27, 2014 Share Posted November 27, 2014 or drop some red particles down, stick on collision, then attribute transfer Cd and use blend width to blur. add snow on red primitves.. Quote Link to comment Share on other sites More sharing options...
TheDrop Posted November 30, 2014 Author Share Posted November 30, 2014 Thanks Skybar and loopyllama for your advice! Quote Link to comment Share on other sites More sharing options...
kleer001 Posted December 1, 2014 Share Posted December 1, 2014 I would scatter points on a plane above everything then Ray SOP them in the -Y. No need for particles. Quote Link to comment Share on other sites More sharing options...
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