Particle scale

[evanrudefx]

Question about particle scale. All I did was create a location particle emitter. Then I converted the particles using the vdb from particles. Here is the question: What is the best way to control the scale of each particle, and what is determining the scale it is outputting to the vdb node? See how big the particles appear to be in the vdb picture?

 

Thanks 

Edited April 28, 2017 by ejr32123

[Hector_md]

what0s your intention?

 

You could use a point sop and modify the scale of the points with simple expressions usings the life of the particles, age or other parameters.

Edited April 28, 2017 by Hector_md

[sandford]

Create pScale attribute with an AttributeVOP and control it with a ramp? (random ID, fit range, into ramp, bind export out.) Usually a good way to do it.

Could do it in a wrangle also, use certain attributes from your popnet or a Point SOP like @Hector_md suggested. (Age can be a good one.)

As for the scale from the VBD node, the Point Radius Scale is multiplying the particle scale. 

[evanrudefx]

Thanks for the responses, I will test them out.

[evanrudefx]

Thanks, I got it working : )

[evanrudefx]

I am trying to get random particle scale. In my source_particles, I created a attribute vop and added the attribute pscale. I have a constant and a random being multiplied together. The random node is giving every particle the same scale instead of different values, I think.y

rando.hipnc

[Sepu]

you need to connect you random node to P if not it doesnt know what is going. Also you can use the attribute Randomize directly.

[evanrudefx]

hmm... that doesnt seem to fix it: connecting p to random causes the scale to change as the particle is moving through space

Edited April 29, 2017 by ejr32123

[evanrudefx]

I found another way of doing it, just using and attribute random. I had never seen that node before,  but it seems to work.

[evanrudefx]

For some reason once the particles start dying the random size starts freaking out and changes scale every frame, sigh.

[evanrudefx]

Found the problem, i needed to have seed attribute turned on. Thanks for the help : )

[sandford]

@ejr32123 - I added an example inside your scene file. (I made it in 10 minutes but I think I made the vop properly.)

rando_pscale.hipnc

Edited April 29, 2017 by sandford

[evanrudefx]

4 hours ago, sandford said:

@ejr32123 - I added an example inside your scene file. (I made it in 10 minutes but I think I made the vop properly.)

rando_pscale.hipnc

Hah, thanks!!!