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  Just trying to understand FBOs  (Read 433 times)
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Offline NegativeZero

JGO Coder


Medals: 14
Projects: 2


Zero but not.


« Posted 2013-06-25 01:30:29 »

So, from what I understand about FBOs, they are textures that can be rendered to.
So, does this mean things like Portal's portal effect would be achieved through that?

EDIT: Shocked, 100th post.
Offline ra4king

JGO Kernel


Medals: 322
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Exp: 4 years


I'm the King!


« Reply #1 - Posted 2013-06-25 03:04:16 »

Yup!

Offline sproingie
« Reply #2 - Posted 2013-06-25 04:05:44 »

If you listen to the commentaries in Portal 1, they mention doing some crazy stuff with the stencil buffer to handle the effect.  They obviously don't spill all the beans on how they accomplish it, but there's some insights in there you'll want to pay attention to.
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Offline quew8

JGO Coder


Medals: 23



« Reply #3 - Posted 2013-06-25 16:02:20 »

Also, awesome wikibook on creating portal-esque rendering with stencil buffer:

http://en.wikibooks.org/wiki/OpenGL_Programming#Mini-portal
Offline davedes
« Reply #4 - Posted 2013-06-25 16:24:40 »

More info on FBOs here, with LWJGL and LibGDX examples:
https://github.com/mattdesl/lwjgl-basics/wiki/FrameBufferObjects

Smiley

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