Simple rain effect shader

Hey guys,
i developed a rain shader yesterday and i want to share the technique with you
Here is a little tech-demo with the shader and setup code.
Have fun with it!

Download here!


The rain itself is a simple effect. The system renderns some cylinder shapes around the camera and uses triplanar texture mapping for the rain texture. Now this texture gets blended additive to the screen. Looks pretty good and eats a lot less power than particles

Greets!
Felix

Thanks a lot for this, could this also be transformed to handle snow as well ? It would be a lot of help to my rpg weather system

i think it could work (and as i also need some good snow effect i will try to port it for snow also)

That would be great...Again thanks for this

in theory it could be also used for a fog effect, like the one using sprites moving around the camera.

Thank you

I can see some horizontal flickering lines, probably the cylinder borders.

Looks good, but blending the rain additively isn't the best idea.
Blending it the 'default' way should provide better quality and since the pixels differ only in their opacity and not in color the rendering order doesn't matter (shouldn't be a prob to render them ordered if necessary, though).

Beside the horizontal artifacts, it is pretty convincing, even if I mute the demo

I found a simple workaround for fixing the noise/artifacts
Use 0.0125 for the rain scaling instead of 0.125
it's not completly gone but much better.

I am currently working on some kind of rain blocker to let rain only fall onto the top level and not below

Hm you could trace upwards and then start/stop rain?

i am working on some kind of "shadow mapping" for the rain