hdr vs anti aliasing

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morgon

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Jan 5, 2014
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curious about these graphic settings.

I can run a sim 16x times anti aliasing and 16x anisotropic but notice a huge difference in fps if change those to HDR 4x ssaa+fxaa and 1x anisotropic filter but yet I see no difference in gain with graphics with my own eyes and it actually looks worse on things in distance?
 
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Hi,

High Dynamic Range is completely independent of Anti-Aliasing.

In a Low Dynamic Range (LDR) scene, the level of brightness at a particular pixel can be evaluated as a floating point value on the range of 0.0...1.0. This range is known as the dynamic range. In outdoor scenes light reflection from a high intensity source is often used to construct both shadows and high intensity reflections, so a shiny surface...
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Pinhedd

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Aug 7, 2007
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Hi,

High Dynamic Range is completely independent of Anti-Aliasing.

In a Low Dynamic Range (LDR) scene, the level of brightness at a particular pixel can be evaluated as a floating point value on the range of 0.0...1.0. This range is known as the dynamic range. In outdoor scenes light reflection from a high intensity source is often used to construct both shadows and high intensity reflections, so a shiny surface exposed directly to the sun should appear quite bright. In an LDR scene the sun would have to be capped at 1.0, and pitch black at 0.0. Individual intensities are calculated by approximating the reflection and refraction of light off of various surfaces on the scene with each reflection losing some intensity. Points that would ideally be brighter than 1.0 are capped to 1.0, and points that would ideally be darker than 0.0 are capped to 0.0, this capping occurs at each stage so scene contrast may be lost due to limitations in the rendering process.

With HDR enabled, the range of possible intensities is greatly increased. Brightness can be computed in an unbounded fashion, and then normalized to the appropriate range after all is said and done. This is more computationally expensive, but preserves the scene contrast.
 
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