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While it may be possible to merge two nparticles into one mesh...but I can’t help you with that.
But I can make a suggestion to solve the issue that you said is keeping you from just using one particleShape in the first place.
When a particle is emitted it has an attribute called emitterId. This can be used as an easy way to use a single particleShape but give it different attributes based on which emitter it came from.
To see the emitterId of your particle just change the ‘Particle Render Type’ to ‘Numeric’ under the Shading Tab of the particleShape. Then just type ‘emitterId’ into the Attribute Name box that becomes active.
If you have two emitters in your scene there should be a bunch of 1s and 2s.
Now to create an expression to drive the radius of the particles based on this.
Since you mentioned these are nparticles you are working with you first need to break the connection to the ramp that drives the particle radiusPP by default...found under the ‘Per Particle (Array) Attributes’ tab on the nparticleShape.
Once that connection is broken, right click the radiusPP box and select ‘Creation Expression’
A simple if/else expression could get you started...give this a try, replacing ‘nParticleShape1’ with whatever the name of you particle is...and of course change the numbers as you like.
Just click ‘Create’ when you are done and ‘Edit’ every time you make a change to the expression.
if (nParticleShape1.emitterId == 1)
{
nParticleShape1.radiusPP = 1;
}
else
{
nParticleShape1.radiusPP = .5;
}
If you had the radiusPP change over time with that great default ramp that was connected by default, you can create the same effect with a simple Runtime before dynamics expression.
Just click that button in the expression editor and try something like this.
nParticleShape1.radiusPP *= .98;
Hopefully this helps more than it hurts.
I’ll attach a simple scene just in case that helps.
Feel free to post if you need any clarification.
All the best.
~Ben
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