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activate dop network by color

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wahookah
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Joined: Oct. 2015
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I spent a whole day trying to figure it out, maybe somone could help me out:

i tried to modify Johnny Farmfield´s Ash setup, in order to activate the ash through changing color
by basically a color ramp with noise, where white should activate the particles.
https://vimeo.com/268754373 [vimeo.com]

In the example he changed the mass from right to left with the expression 

if(@P.x < ch("active")){
    @mass = 0;
}else{
    @mass = 1;
}

i added the ramp just before the dop network (on primitive level) and changed it to 
if(@Cd.r < 1){
    @mass = 0;
}else{
    @mass = 1;
}

so i tried to change the mass from 0 to 1, when the primitive has a value of 1 (white, or red in this case).
Also sometimes houdini crashes while doing the ramp, sometimes not

I´m sure it´s just a basic thing, but maybe someone could point me to the right direction.
thank you
Edited by wahookah - Sept. 5, 2018 14:59:36

Attachments:
simple_dissolve_modified.hiplc (543.3 KB)

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