radiusPP into density

[Aikiman]

Hi,

I need to connect my cloud particleshape's radiusPP into density of its shader. When radiusPP increases, the density has to reduce.

Any help is much appriciated

Thanks.

Try this...create a new per particle attr from the attribute list userScalar1PP and in the expression editor write this code in runtime

particleShape1.userScalar1PP=1-particleShape1.radiusPP;

this assumes your maximum radius is 1. Now hook the particle sampler info node particleShape1.userScalar1PP to density in hypershade.
If your radiusPP max is greater than 1 then you gunna have to normalise your expression with linstep because density is 0-1 so...

particleShape1.userScalar1PP=1-linstep(0,5,particleShape1.radiusPP);

for example.

Another way is to use the utility nodes, (I think this works?!) Hook the particle sampler Info Node up to a setRange with the new min max 0-1 and old min max 0-5 for example. Then pipe that into a reverse node then into density. Probably a lot quicker than the expression to evaluate.

Hope that works. ;)

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