$ambientocclusion: Difference between revisions
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Bug:When used on transparent materials (either
Note:Used to control the strength of the SSAO for models in Source Filmmaker.
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[[Image:valveao.jpg|thumb|200px|Various WrinkleMaps maps found in Valve games for eyes and face.]] | [[Image:valveao.jpg|thumb|200px|Various WrinkleMaps maps found in Valve games for eyes and face.]] | ||
'''Ambient occlusion''' is a shading method which helps add realism to local reflection models by taking into account attenuation of light due to occlusion {{clarify}}. Unlike local methods like Phong shading, ambient occlusion is a global method, meaning the illumination at each point is a function of other geometry in the scene. However, it is a very crude approximation to full global illumination. The soft appearance achieved by ambient occlusion alone is similar to the way an object appears on an overcast day. It is globally supported on the EyeRefract shader. The [[Source Filmmaker|IFM]] module, when loaded, makes the '''$ambientocclusion''' parameter function on other shaders such as [[VertexLitGeneric]] as a means of controlling the intensity of SSAO. | '''Ambient occlusion''' is a shading method which helps add realism to local reflection models by taking into account attenuation of light due to occlusion {{clarify}}. Unlike local methods like [[Phong materials|Phong shading]], ambient occlusion is a global method, meaning the illumination at each point is a function of other geometry in the scene. However, it is a very crude approximation to full global illumination. The soft appearance achieved by ambient occlusion alone is similar to the way an object appears on an overcast day. It is globally supported on the [[EyeRefract]] shader. The [[Source Filmmaker|IFM]] module, when loaded, makes the '''<code>$ambientocclusion</code>''' parameter function on other shaders such as [[VertexLitGeneric]] as a means of controlling the intensity of [[Screen Space Ambient Occlusion (SSAO)|SSAO]]. | ||
{{Bug|When used on transparent materials (either <code>[[$translucent]]</code> or <code>[[$alphatest]]</code>, or all materials on a model where a transparent material has been used without compiling with either <code>$Opaque</code> or <code>$MostlyOpaque</code> in the QC file), <code>$ambientocclusion</code> also causes the material to render the effect for any objects behind the material. ''(Tested in Source Filmmaker)''}} | |||
== Using Ambient Occlusion == | == Using Ambient Occlusion == | ||
=== Example VMT Syntax === | === Example VMT Syntax === | ||
The following example is taken from [[Left 4 Dead]] from the model material located in <code>L4D root/materials/models/survivors/teenangst/teenangst_eyeball_l.vmt</code> | The following example is taken from [[Left 4 Dead]] from the model material located in <code>L4D root/materials/models/survivors/teenangst/teenangst_eyeball_l.vmt</code> | ||
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EyeRefract | EyeRefract | ||
{ | { | ||
$Iris "models/survivors/green_iris2" | $Iris "models/survivors/green_iris2" | ||
$AmbientOcclTexture "models/survivors/survivor_eye_ao" | $AmbientOcclTexture "models/survivors/survivor_eye_ao" | ||
$Envmap "Engine/eye-reflection-cubemap-" | $Envmap "Engine/eye-reflection-cubemap-" | ||
$CorneaTexture "Engine/eye-cornea" | $CorneaTexture "Engine/eye-cornea" | ||
$EyeballRadius "0.6" | $EyeballRadius "0.6" | ||
$AmbientOcclColor "[.4 .4 .4]" Default 0.33, 0.33, 0.33 | $AmbientOcclColor "[.4 .4 .4]" Default 0.33, 0.33, 0.33 | ||
$Dilation ".5" | $Dilation ".5" | ||
$ParallaxStrength "0.25" | $ParallaxStrength "0.25" | ||
$CorneaBumpStrength ".5" | $CorneaBumpStrength ".5" | ||
$halflambert 1 | $halflambert 1 | ||
$nodecal 1 | $nodecal 1 | ||
$ambientocclusion 1 | $ambientocclusion 1 | ||
$RaytraceSphere 1 | $RaytraceSphere 1 | ||
$SphereTexkillCombo 0 | $SphereTexkillCombo 0 | ||
} | } | ||
</pre> | </pre> | ||
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=== VMT Parameters === | === VMT Parameters === | ||
;<code>$AmbientOcclusion <float></code> | ;<code>$AmbientOcclusion <[[float]]></code> | ||
: Controls strength of Ambient Occlusion. (1 = fully enabled, 0 = fully disabled) | : Controls strength of Ambient Occlusion. (1 = fully enabled, 0 = fully disabled) | ||
{{note|Used to control the strength of the SSAO for models in Source Filmmaker.}} | {{note|Used to control the strength of the SSAO for models in Source Filmmaker.}} | ||
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: Filename of the ambient occlusion texture to use | : Filename of the ambient occlusion texture to use | ||
{{TODO|How does <code>$ambientocclusiontexture</code> fit in with all of this?}} | {{TODO|How does <code>$ambientocclusiontexture</code> fit in with all of this?}} | ||
== See also == | == See also == | ||
* [[Phong materials]] | * [[Phong materials|Phong Materials]] | ||
* [[$phong]] | * [[$phong]] | ||
* [[$basetexture]] | * [[$basetexture]] | ||
Revision as of 01:22, 31 July 2019
Ambient occlusion is a shading method which helps add realism to local reflection models by taking into account attenuation of light due to occlusion [Clarify]. Unlike local methods like Phong shading, ambient occlusion is a global method, meaning the illumination at each point is a function of other geometry in the scene. However, it is a very crude approximation to full global illumination. The soft appearance achieved by ambient occlusion alone is similar to the way an object appears on an overcast day. It is globally supported on the EyeRefract shader. The IFM module, when loaded, makes the $ambientocclusion parameter function on other shaders such as VertexLitGeneric as a means of controlling the intensity of SSAO.
Bug:When used on transparent materials (either $translucent or $alphatest, or all materials on a model where a transparent material has been used without compiling with either $Opaque or $MostlyOpaque in the QC file), $ambientocclusion also causes the material to render the effect for any objects behind the material. (Tested in Source Filmmaker) [todo tested in ?]Using Ambient Occlusion
Example VMT Syntax
The following example is taken from Left 4 Dead from the model material located in L4D root/materials/models/survivors/teenangst/teenangst_eyeball_l.vmt
EyeRefract
{
$Iris "models/survivors/green_iris2"
$AmbientOcclTexture "models/survivors/survivor_eye_ao"
$Envmap "Engine/eye-reflection-cubemap-"
$CorneaTexture "Engine/eye-cornea"
$EyeballRadius "0.6"
$AmbientOcclColor "[.4 .4 .4]" Default 0.33, 0.33, 0.33
$Dilation ".5"
$ParallaxStrength "0.25"
$CorneaBumpStrength ".5"
$halflambert 1
$nodecal 1
$ambientocclusion 1
$RaytraceSphere 1
$SphereTexkillCombo 0
}
VMT Parameters
$AmbientOcclusion <float>- Controls strength of Ambient Occlusion. (1 = fully enabled, 0 = fully disabled)
Note:Used to control the strength of the SSAO for models in Source Filmmaker.$AmbientOcclColor "[.n .n .n]"- Replacing n with a number of the color (RGB format)
$AmbientOcclTexture "path/to/vtf"- Filename of the ambient occlusion texture to use
Todo: How does
$ambientocclusiontexture fit in with all of this?See also
- Phong Materials
- $phong
- $basetexture
- $envmapmask (specular mask)
- $envmap (environment map)
- $selfillum