Individual particle color

Forums Houdini Indie and Apprentice Individual particle color

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rurik2000: Member; 87 posts; Joined: Aug. 2009; Offline

Sept. 3, 2009 2:56 p.m.

I'm sorry if this has been adressed before, but what is the most elegant way to have each particle in a PopNet have a single color? I feel I've seen a tutorial about this but I'm having a brain fart. Any pointers would be greatly appreciated

Thanks
Alex


aiworks: Member; 130 posts; Joined: April 2009; Offline

Sept. 3, 2009 4:38 p.m.

Hi,

A point node with “add color”?

Cheers,
Greg

Attachments:
colorize_particles.png (52.9 KB)


rurik2000: Member; 87 posts; Joined: Aug. 2009; Offline

Sept. 3, 2009 4:55 p.m.

Great, thanks!
Now I'm using an Attributetransfer to get the color onto the trails I'm creating from the particles, but for some reason the trails keep changing color too. It is a nice effect, but not what I'm after. I would expect that one particle is one point, it is transferred to one sphere, that sphere creates a trail, and that trail stays the color of the particle that “caused” it.
Does that make sense? What am I missing?

Thanks
Alex

Attachments:
Picture 4.png (792.8 KB)


aiworks: Member; 130 posts; Joined: April 2009; Offline

Sept. 3, 2009 5:15 p.m.

Hi,

It might be weird idea, but - since you are doing quite looong trails, if they are longer than a lifetime of individual particle, then when particles die, the numbering might chanage for those that are still alive.

This might be responsible for sudden changes of colour?

Greg


rurik2000: Member; 87 posts; Joined: Aug. 2009; Offline

Sept. 3, 2009 5:25 p.m.

I don't think that is the reason, as the life expectancy of the particles is set to 200, and mostly because the color change happens even at the very beginning of the animation, I can almost see it happening on different facets of the sphere as it is emerging from the grid.


alpotnis: Member; 34 posts; Joined: Feb. 2008; Offline

Sept. 10, 2009 7:17 a.m.

how about adding a point sop with a “rand” expression called in the color filed …am attaching a file for your reference.

-alok

Attachments:
randColor.hipnc (70.0 KB)


varomix: Member; 460 posts; Joined: July 2005; Offline

Sept. 10, 2009 12:14 p.m.

I did it like this

hope that can helps you

Attachments:
_mix_strands_v02.hipnc (54.6 KB)
strands.png (120.0 KB)

varomix - Founder | Educator @ Mix Training
Technical Artist @ Meta Reality Labs

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