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Author Topic: Post Process Effects  (Read 174 times)

matan45

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Post Process Effects
« on: December 09, 2017, 07:33:34 »

how can I do Eye Adaptation? I didn't find any resource about it   
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KaiHH

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Re: Post Process Effects
« Reply #1 on: December 09, 2017, 13:19:33 »

you eyes will do it automatically for you. see https://en.wikipedia.org/wiki/Adaptation_(eye)
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matan45

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Re: Post Process Effects
« Reply #2 on: December 10, 2017, 08:01:22 »

no examples of glsl
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KaiHH

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Re: Post Process Effects
« Reply #3 on: December 10, 2017, 11:57:59 »

you already mentioned a link in another post about Tone Mapping of HDR images: https://learnopengl.com/#!Advanced-Lighting/HDR
What you need to be doing is called "Tone Mapping", so google a bit for it. For example: "Tone Mapping OpenGL" or "Tone Mapping GLSL", and you will surely find something.
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matan45

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Re: Post Process Effects
« Reply #4 on: December 10, 2017, 16:23:30 »

this is a lot of tone mapping functions which one is the eye Adaptation?
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KaiHH

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Re: Post Process Effects
« Reply #5 on: December 10, 2017, 17:58:25 »

You first have to understand how one would implement eye adaptation. You should _really_ use your google skills more often.
One great example of what eye adaptation should consist of is given here: https://docs.unrealengine.com/latest/INT/Engine/Rendering/PostProcessEffects/AutomaticExposure/
So, you would first have to build a histogram of your scene's luminances and then find the lowest/average/highest values to guide your tone mapping.
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