Marcel Stockli

Hi all!

I just started to write in a blog about my work in Attractio (our game), this is my first post, it is about my work with the Attractio Walls.  It use some POM and deferred terms.

 

 

 

http://attractio.wordpress.com/2013/01/02/the-making-of-the-attractio-walls/

 

Feedbacks are highly welcomed!

 

 

 

 

 

Hi all,
I am trying to recover a particle system that I programmed some time ago.
The main difference between "some time ago" and "now" in my engine is that now I render all transparent objects in a different buffer. This buffer is a multi render target (2 buffers) of 64 bits per pixel each buffer. I do this because I use one buffer for color and the another one for displacement.
I have an issue with the blending, I use the standar blending new*alfa+old*(1-alfa) (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) and with 30,000 particles I have this:




The expected result should be be different, something like this:



This pictures has only 1,000 particles because I use new+old blending (GL_ONE,GL_ONE) for this screenshot. It's only to exemplify the expected result, but of course is wrong, with more particles everything will become white.

Any idea of why I am getting this behavior with GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA? I am not sure if the problem is the multi render target or the 64 bits buffers.

Thanks