Particle density/transparency in the viewport

[Pancho]

Can I change the transparency of the particles in the viewport? Actually I would like them to fade out over time. While this is possible for sure with the actual shader, I would like to preview the behavior in the viewport, so the particle color gets more transparent over time. Possible?

Cheers
Thomas

[Bullit]

For a speedy trick get particle color>multiply color by scalar>set particle color

Put alpha on and factor to 0.9 or more.

[nixx]

Or maybe even better,

separate the color channels using an rgba to color node, operate only on the alpha, then combine them back with a color to rgba. That way you won't mess with the actual color of the particles (if you 're using that in the shader).

You can save it as a quick compound named "modify particle alpha" or something, it often comes in handy.

[Bullit]

Separate with color to rgba isn't it?

It works but you need to define a timer or frame counter since all particles fade at same time.

[Pancho]

Thanks!!! Works like charme!

[nixx]

Separate with color to rgba isn't it?

Yeah, I got the nodes backwards, it was the middle of the night

It works but you need to define a timer or frame counter since all particles fade at same time.

You could use a per-particle attribute, like age for example.

[Pancho]

That's what I did. Per particle.

[Bullit]

Yep forgot about that.

Edit: Pancho with my option you don't need that.