TeaLeaf Posted May 10, 2010 Share Posted May 10, 2010 Hi Guys, I have some particles emitted into a volume (source POP > Emission Type > Volume), and pushed about using noise. I'd like the particles that leave the volume to fade out over a few frames. I have 2 groups, 1 called inside, that is a group using a bounding object, and another group that is the opposite of this called outside. I can plug outside into a kill pop and they die as expected but I want to avoid them popping off. I know that it has something to do with the lookup in the color pop, but don't know how to capture the frame that the particle joined the group on so I can fade it. Any help would be apprieciated. Cheers, AnDy Quote Link to comment Share on other sites More sharing options...
mightcouldb1 Posted May 11, 2010 Share Posted May 11, 2010 I'm not sure if this is what you are looking for, but I put together an example for you. Simply put, the density of the volume is being mapped to the color. Jason colorByVolume.hip Quote Link to comment Share on other sites More sharing options...
TeaLeaf Posted May 11, 2010 Author Share Posted May 11, 2010 I'm not sure if this is what you are looking for, but I put together an example for you. Simply put, the density of the volume is being mapped to the color. Jason Hi Jason, I've added a simple scene, for some reason my apprentice at work is crashing, but when the red particles leave the box object, I'd like them to fade to black over say 10 frames. Cheers, AnDy fadeLavingVolume.hipnc Quote Link to comment Share on other sites More sharing options...
anim Posted May 11, 2010 Share Posted May 11, 2010 here is a simple example color POP sets color and Alpha only when particle is created VOP POP is fading Alpha to 0 in outside group over specified number of frames/seconds then kill POP kills all particles with zero Alpha i've changed particle visualization to sprites in display options so you can see fading in viewport fadeLavingVolume_fix.hipnc Quote Link to comment Share on other sites More sharing options...
mightcouldb1 Posted May 11, 2010 Share Posted May 11, 2010 (edited) No need for VOPs for this effect. You can set age to 0 for the inside group and age will begin to increment when particles exit the group. Note that if the particles leave the group and enter it again, age will be set to 0. The expression to create the fade is age/lifespan which normalizes the age of the particles. Jason Edit: *gawks at anim's solution* fadeLeavingVolume_mightcouldb1.hipnc Edited May 11, 2010 by mightcouldb1 Quote Link to comment Share on other sites More sharing options...
TeaLeaf Posted May 11, 2010 Author Share Posted May 11, 2010 Hi Guys, Thanks for these, it was good to get 2 different approaches, much appreciated! Cheers, AnDy Quote Link to comment Share on other sites More sharing options...
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