blending - smoke sprites

Graphics and GPU Programming Programming

Started by judge dreadz April 05, 2006 06:21 PM

13 comments, last by dpadam450 18 years ago

1,298

April 06, 2006 09:26 AM

Quote:Original post by judge dreadzif i use (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) it looks better, but its a bit dark. the trouble with both is that they seem to lose a lot all the detail and look a bit blobby. they are both commutative additive functions right?

Wrong. SRC_ALPHA, ONE_MINUS_SRC_ALPHA is not communative or additive and is what you want for smoke.

[size="1"][[size="1"]TriangularPixels.com[size="1"]] [[size="1"]Rescue Squad[size="1"]] [[size="1"]Snowman Village[size="1"]] [[size="1"]Growth Spurt[size="1"]]

judge dreadz

193

Author

April 06, 2006 09:41 AM

Quote:Original post by Kalidor
Just so you know, glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) is what people mean when they talk about standard alpha blending. If that still doesn't look right to you maybe it's a problem with your art? A screenshot would definitely help.

ok, thats all i needed to know really, thanks. so if i use glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) then i need to sort the particles first so they render in the right order? would that maybe make it look better? heres a screen shot anyway, as you can see it all looks a bit blobby, theres not much detail going on. looks kind of like frog spawn at the moment.

smoke sprites

OrangyTang

1,298

April 06, 2006 10:24 AM

Looks about right, try making the particles about twice as big and adding more contrast and variation in the smoke texture. Also try changing the colour tint based on how old the particle is.

[size="1"][[size="1"]TriangularPixels.com[size="1"]] [[size="1"]Rescue Squad[size="1"]] [[size="1"]Snowman Village[size="1"]] [[size="1"]Growth Spurt[size="1"]]

zedzeek

529

April 06, 2006 02:53 PM

i cant see the screenshot
but yes u need to sort the polys also
use glDepthMask( GL_FALSE );
when u draw the smoke

Captain Courgette, eat more veg

dpadam450

2,403

April 07, 2006 12:42 AM

Well if you are doing squares rendered with a smoke cloud texture, then make anything that you want to blend with the background complete black. Then use glBlendFunc(GL_SRC_ALPHA, GL_ONE).

NBA2K, Madden, Maneater, Killing Floor, Sims http://www.pawlowskipinball.com/pinballeternal

blending - smoke sprites

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

blending - smoke sprites

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines