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matches81

Member Since 23 Feb 2005
Offline Last Active Sep 12 2012 07:21 PM

#3826917 Forward vs. Deferred Rendering

Posted by matches81 on 21 November 2006 - 01:05 AM

I´ve implemented a really simple deferred renderer some time ago and am switching over to a forward renderer right now. The thing I liked the most about the deferred renderer was its simplicity, as you don´t have to bother with which object is lit by which lights. That makes it rather easy to get working. Furthermore you only have to do stuff like normal mapping, parallax mapping or similar things, skinning and so on only once, no matter how many lights you have, which would allow you to use those things more extensively, I guess.

The main thing I didn´t like about it was the rather high cost to get started, so it won´t pay off in "simple scenes" (less lights especially). Perhaps I´ve done something wrong, but I was under the impression that the geometry pass (filling the render-targets with depth, normals, diffuse and specular color and so on) was rather expensive. I think this only pays off if you´re going to have a large number of lights visible at once.
Another thing that is always brought forward when a deferred renderer is discussed is the currently missing support of hardware anti-aliasing. I didn´t like that, too, but I guess it is up to you whether you need anti-aliasing or not.

As my project won´t have that much skinning and/or normal-mapping (and similar) going on and won´t have _that_ many lights visible at once I´m now giving a forward renderer a try.

Don´t know if this post was helpful, but here it is ;)


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