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This page provides information on the native Unreal Materials and Material Instances.

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Overview

 

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V-Ray for Unreal support the rendering of native Unreal Materials and Material Instances. Materials are used to calculate how light interacts with surfaces. These calculations are done using incoming data that is input to the Material from a variety of images (textures) and math expressions, as well as from various property settings inherent to the Material itself. Each time a change is made in the material it has to recompile which can be very time consuming depending on the complexity of the shading graph. Material instancing is used to change the appearance of a Material without incurring an expensive recompilation of the Material using predefined parameters. For more information on Unreal Materials and Material Instances check the Materials documentation.

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Supported Expressions

Below are listed the expressions in the Material Editor that are supported by V-Ray for Unreal.

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Native Unreal Materials are supported in Hybrid rendering. Make sure you meet the System Requirements.

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CategoryExpressions
Atmosphere
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 Support
AtmosphericFogColor-

Constants

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 Support
Constant✓
Constant2Vector✓
Constant3Vector✓
Constant4Vector✓
DistanceCullFade-
ParticleColor-
ParticleDirection-
ParticleMotionBlurFade-
ParticleRadius-
ParticleRelativeTime-
ParticleSize-
ParticleSpeed-
PerInstanceFadeAmount-
PerInstanceRandom-
Time 2partial
TwoSidedSign✓
(plus) NEW VertexColor✓
View Property 1partial
Precomputed AO Mask-
Coordinates
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 Support
LightmapUVs-
(plus) NEW  ObjectRadius✓
Panner✓
ParticlePositionWS-
Rotator✓
SceneTexelSize-
ScreenPosition✓
TextureCoordinate 3partial
ViewSize-
WorldPosition ✓
Custom
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 Support
Custom-
Depth
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 Support
DepthFade-
 PixelDepth✓
SceneDepth-
Function
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 Support
FunctionInput✓
FunctionOutput✓
MaterialFunctionCall✓
StaticBool✓
StaticSwitch✓
Material Attributes
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 Support
BreakMaterialAttributes✓
MakeMaterialAttributes✓
Math
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 Support
Abs✓
Add✓
AppendVector✓
 Arccosine✓
ArccosineFastpartial
 Arcsine✓
ArcsineFastpartial
 Arctangent✓
 Arctangent2✓
Arctangent2fastpartial
ArctangentFastpartial
Ceil✓
Clamp✓
ComponentMask✓
Cosine✓
CrossProduct✓
Divide✓
DotProduct✓
Floor✓
Fmod✓
Frac✓
If✓
LinearInterpolate✓
Logarithm10-
 Logarithm2✓
Max✓
Min✓
Multiply✓
Normalize✓
OneMinus✓
Power✓
Round✓
Saturate✓
Sign✓
Sine✓
SquareRoot✓
Subtract✓
 Tangent✓
Truncate✓
Parameters
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 Support
CollectionParameters-
DynamicParameter-
FontSampleParameter-
ScalarParameter✓
StaticBoolParameter✓
StaticSwitchParameter✓
StaticComponentMaskParameter-
VectorParameter✓
TextureObjectParameter✓
TextureSampleParameter2D✓
TextureSampleParameterSubUV-
TextureSampleParameterCube-
TextureSampleParameterMovie-
Particles
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 Support
DynamicParameter-
ParticleColor-
ParticleDirection-
ParticleMacroUV-
ParticleMotionBlurFade-
ParticlePositionWS-
ParticleRadius-
ParticleRelativeTime-
ParticleSize-
ParticleSpeed-
SphericalParticleOpacity-
ParticleSubUV-
Terrain
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 Support
LanscapeLayerBlend-
LandscapeLayerCoords-
LandscapeLayerSwitch-
LandscapeLayerWeight-
LanscapeVisibilityMask-
Texture
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 Support
FontSample-
SceneColor-
SpriteTrextureSampler-
TextureObject✓
TextureSample✓
TextureProperty-
Utility
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 Support
AntialiasedTextureMask-
BlackBody-
BumpOffset✓
ConstantBiasScale✓
DDX 4partial
DDY 4partial
DepthOfFieldFunction-
Desaturation✓
Distance✓
DistanceFieldGradient-
DistanceToNearestSurface-
FeatureLevelSwitch-
Fresnel✓
GIReplace-
LightmassReplace-
Noise-
PreviousFrameSwitch-
QualitySwitch-
(plus) NEW RotateAboutAxis-✓
SphereMask✓
Vector Noise-
VectorOps
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 Support
ActorPositionWS-
CameraPositionWS✓
CameraVectorWS✓
DeriveNormalZ-
LightVector-
ObjectBounds-
ObjectOrientation-
ObjectPositionWS✓
ParticlePositionWS-
PixelNormalWS✓
Pre-Skinned Local Normal-
Pre-Skinned Local Position-
ReflectionVectorWS✓
Transform✓
TransformPositionpartial
VertexNormalWS✓
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If the Coordinate Index in the TextureCoordinate node in a material is set to a certain value and the material is applied to a Static mesh that doesn't have a corresponding UV channel, then that mesh will not render correctly in V-Ray. For example, the Coordinate Index in a material that is applied to a static mesh is set to 3 but the mesh has only 2 UV channels then the render result will be inaccurate.

 

 

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Supported Material Inputs, Blend Modes and Shading Models

Below are listed all inputs, Blend modes and Shading models in the Material Editor that are supported by V-Ray for Unreal.

 

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Inputs 
Base Color✓
Metallic✓
Specular✓
Roughness✓
Emissive Color✓
Opacity✓
Opacity Mask✓
Normal✓
World Position Offset-
World Displacement-
Tessellation Multiplier-
Subsurface Color✓
Clear Coat✓
Clear Coat Roughness✓
Ambient Occlusion-
Refraction-
Pixel Depth Offset-
ClearCoatBottomNormal✓

 

 

 



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Blend Modes 
Opaque✓
Masked✓
Translucent✓
Additive-
Modulate- 
Alpha Composite✓

 

 

 

 

 

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Shading Modes 
Unlit✓
Default Lit✓
Subsurface✓
Preintegrated Skin-
Clear Coat✓
Subsurface Profile-
Two Sided Foliage✓
Hair-
Cloth-
Eye-

 

 

 

 

 

 

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Footnotes

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1 – Only Camera Position (Absolute World Space) and Viewport Offset are supported.

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2 – Time is not currently supported in animation.

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3 – Tiling and mirror options are not supported.

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4 – Will be skipped in the shader graph.