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

Overview

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.

V-Ray for Unreal > Unreal Materials And Material Instances > Automotive_Viz_Exterior_Matte_VRAY_Viewport.jpg

Supported Expressions

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

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

Category

Expressions

Atmosphere

	Support
AtmosphericFogColor	-

Constants

	Support
Constant	✓
Constant2Vector	✓
Constant3Vector	✓
Constant4Vector	✓
DistanceCullFade	-
ParticleColor	-
ParticleDirection	-
ParticleMotionBlurFade	-
ParticleRadius	-
ParticleRelativeTime	-
ParticleSize	-
ParticleSpeed	-
PerInstanceFadeAmount	-
PerInstanceRandom	-
Time²	partial
TwoSidedSign	✓
VertexColor	-
View Property ¹	partial
Precomputed AO Mask	-

Coordinates

	Support
LightmapUVs	-
ObjectRadius	-
Panner	✓
ParticlePositionWS	-
Rotator	✓
SceneTexelSize	-
ScreenPosition	✓
TextureCoordinate ³	partial
ViewSize	-
WorldPosition	✓

Custom

	Support
Custom	-

Depth

	Support
DepthFade	-
NEW PixelDepth	✓
SceneDepth	-

Function

	Support
FunctionInput	✓
FunctionOutput	✓
MaterialFunctionCall	✓
StaticBool	✓
StaticSwitch	✓

Material Attributes

	Support
BreakMaterialAttributes	✓
MakeMaterialAttributes	✓

Math

	Support
Abs	✓
Add	✓
AppendVector	✓
Arccosine	✓
ArccosineFast	-
Arcsine	✓
ArcsineFast	-
Arctangent	✓
Arctangent2	✓
Arctangent2fast	-
ArctangentFast	-
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

	Support
CollectionParameters	-
DynamicParameter	-
FontSampleParameter	-
ScalarParameter	✓
StaticBoolParameter	✓
StaticSwitchParameter	✓
StaticComponentMaskParameter	-
VectorParameter	✓
TextureObjectParameter	✓
TextureSampleParameter2D	✓
TextureSampleParameterSubUV	-
TextureSampleParameterCube	-
TextureSampleParameterMovie	-

Particles

	Support
DynamicParameter	-
ParticleColor	-
ParticleDirection	-
ParticleMacroUV	-
ParticleMotionBlurFade	-
ParticlePositionWS	-
ParticleRadius	-
ParticleRelativeTime	-
ParticleSize	-
ParticleSpeed	-
SphericalParticleOpacity	-
ParticleSubUV	-

Terrain

	Support
LanscapeLayerBlend	-
LandscapeLayerCoords	-
LandscapeLayerSwitch	-
LandscapeLayerWeight	-
LanscapeVisibilityMask	-

Texture

	Support
FontSample	-
SceneColor	-
SpriteTrextureSampler	-
TextureObject	✓
TextureSample	✓
TextureProperty	-

Utility

	Support
AntialiasedTextureMask	-
BlackBody	-
BumpOffset	✓
ConstantBiasScale	✓
DDX ⁴	partial
DDY ⁴	partial
DepthOfFieldFunction	-
Desaturation	✓
Distance	✓
DistanceFieldGradient	-
DistanceToNearestSurface	-
FeatureLevelSwitch	-
Fresnel	✓
GIReplace	-
LightmassReplace	-
Noise	-
PreviousFrameSwitch	-
QualitySwitch	-
RotateAboutAxis	-
SphereMask	✓
Vector Noise	-

VectorOps

	Support
ActorPositionWS	-
CameraPositionWS	✓
CameraVectorWS	✓
DeriveNormalZ	-
LightVector	-
ObjectBounds	-
ObjectOrientation	-
ObjectPositionWS	-
ParticlePositionWS	-
PixelNormalWS	✓
Pre-Skinned Local Normal	-
Pre-Skinned Local Position	-
ReflectionVectorWS	✓
Transform	✓
TransformPosition	-
VertexNormalWS	✓

V-Ray for Unreal > Unreal Materials And Material Instances > UE_Expressions.png

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.

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	✓

V-Ray for Unreal > Unreal Materials And Material Instances > UE_Mtl_Inputs.png

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

V-Ray for Unreal > Unreal Materials And Material Instances > UE_Mtl_BlendModes.png

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

V-Ray for Unreal > Unreal Materials And Material Instances > UE_Mtl_ShadingModels.png

Footnotes

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

2 – Time is not currently supported in animation.

3 – Coordinate index 0 is only supported. Tiling and mirror options are not supported.

4 – Will be skipped in the shader graph.