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changes.mady.by.user Gergana Lilkova

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UI Expand
titleLPE Presets: Render Element equivalents
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Preset

Light path expression
Render elements
RGBC.*
Self-illuminationC[OL]
BackgroundCB
LightingC<RD>L
SpecularC<R[GS]>L
GIC<RD>(.+L|.*[OB])
SSSC<TD>(.+L|.*[OB])
ReflectionC<R[GS]>(.+L|.*[OB])
RefractionC<Т[GS]>(.+L|.*[OB])
AtmosphereCV.*
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typetip
It will be faster and more efficient to use the already available render elements instead of their LPE equivalents in the presets, of course - the examples are there as a point of reference.
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UI Expand
titleLPE Presets: Light Select equivalents
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width45%

Preset

Light path expression
Light selects
Direct IlluminationCRL
Direct DiffuseC<RD>L
Direct SpecularC<R[GS]>L
FullC.*L
IndirectCR.+L
Indirect DiffuseC<RD>.+L
Indirect SpecularC<R[GS]>.+L
 
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UI Expand
titleLPE Presets: Misc




 

 

 

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Preset

Light path expression
Misc

Self-illumination, no lights

CO
GI from self-illuminationC<RD>.*O
GI from environmentC<RD>.*B
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UI Expand
titleLPE Presets: Object/Material select



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Preset

Light path expression
Object/Material select

Indirect for object label 1

CR'1'.+L
Indirect for all object labels but 1 and 2CR[^'1''2'].+L
RGB for material label 1C.'m1'.*
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typetip

To use object labels, add V-Ray User Attributes to you object, where the attribute name is lpe_label and equals your custom label. For example, lpe_label=myLabeltestLabel.

To use material labels, add Extra V-Ray Attributes > Light Path Expression Label to your material. When used in expressions, material labels require the m prefix.

See the examples below on how to set up object and material labels.

 
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sizemedium
Align
aligncenter

LPE Object/Material select

LPEs can record information for only specific objects or materials by adding a label.

Read more about capturing LPEs for specific objects and materials in the Advanced Light Path Expressions article.

 
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sizemedium
Align
aligncenter

Coat and Sheen material labels

The coat and sheen material labels are reserved for the additional VRayMtl Coat and Sheen layers.

Read more about using the coat and sheen labels in the Advanced Light Path Expressions article.

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Boolean operations

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Boolean operations allow us to combine expressions. We can complement (^), intersect (&) or unite (|) expressions, or we can subtract (-) one expression from another.

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