The easiest thing is to emit over the whole object then do what you did and plug the output of your 'Less than' into a Delete Particle node.
-----Original Message----- From: Morten Bartholdy Sent: Tuesday, March 14, 2017 11:19 AM To: Official Softimage Users Mailing List. https://groups.google.com/forum/#!forum/xsi_list ; [email protected] Subject: Re: Emit particles frm surfaces facing a particular direction? Thanks Paul. I know stuf like this is trivial to you, but it is not so much the method that escapes me as the lack of a tool that does this. I can figure out how to get a vector from a nulls position and Get Point Normals from my geometry, I can then get the angle between them and put than into a Less than or equal to node, but how to transform a threshold value into either weightmap values, creating a sample set to emit from or filtering an emission, I don't know. I was sort of hoping there would be a node or compound I had overlooked which provided something I could use :) cheers Morten > Den 14. marts 2017 klokken 11:11 skrev [email protected]: > > > You can either > > Emit from the whole and delete the ones that aren't pointing in the right > direction, (based on comparing the normal angle to your preferred vector) > > Or create a weightmap on the object and use ICE to set the values based > upon > the normal angle and use the weightmap in the Emit node. (This wont work > on > low poly meshes for obvious reasons) > > Or make a duplicate of the surface, and use ICE to delete Polys that > aren't > pointing in the right direction, then emit from the resulting object. > > > Number 1 is the easiest to set up. > > Paul > > > -----Original Message----- > From: Morten Bartholdy > Sent: Tuesday, March 14, 2017 10:05 AM > To: Userlist, Softimage > Subject: Emit particles frm surfaces facing a particular direction? > > I have looked through the sample scenes but could not find something that > does this. I want to emit particles from surfaces of an object that faces > in > a particular direction, either a custom vector or fom polygons facing a > null. > > How can I do this? > > Thanks. > > Morten > ------ > Softimage Mailing List. > To unsubscribe, send a mail to [email protected] > with > "unsubscribe" in the subject, and reply to confirm. > > ------ > Softimage Mailing List. > To unsubscribe, send a mail to [email protected] > with "unsubscribe" in the subject, and reply to confirm. ------ Softimage Mailing List. To unsubscribe, send a mail to [email protected] with "unsubscribe" in the subject, and reply to confirm.
