Additive Shader and Sprite Sheets @ Partikel-System

Hello guys,

i've a short question. im building a fire effect with a particle-system. i tried all the different standard particle shaders of unity.

My sprite sheet has 6x6 flames on it with black background.

My question just covers the theorie behind the shader. If i take Additive/Additive(Soft), the fire looks nice, black background is then transparent. But if i take one of the other particle shaders, it isn't.

What's the difference ? Why does it not work with multiply shader, ... ?

How does it exactly work, that only the black background gets transparent ?


Thanks a lot, i've read some information about shaders and so on, but didnt understand it well. I read about the Blending, but didnt got it, how the blending is set at additive, so just the black background will get transparent.

Greetz !

 

no one an explanation ready ?

 

Texture need to be premultiply.

 

and this is the explanation for which question ?
sry, i thought i get an answer i can understand and dont need to interpret

 

http://effectronica.com/?p=1512

This article explains what premultiplied is, and why it can achieve both bright and darkening, which is what you are looking for. You will have to get a native speaker to better interpret it for you if you have difficulty.

You want the section beginning with:

 

it's less understanding what u write but more that u didnt write much, but ok - so no difficulty

ok thx!

 

Fire can also be made simple by using sprite sheets. Sometimes this method is very sufficient (depends on your needs of cause).

Here are some (currently) free sheets: https://www.assetstore.unity3d.com/en/#!/content/51794