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The 3Delight Material is a general purpose, physically plausible, dual-layer material that can be used to render a large variety of surfaces, including the ability to simulate surfaces that have a coating. Coated materials include common real world objects such as furniture, cars, toys  and many plastics. The coating layer adds interesting effects on gazing angles and adds an additional specular highlight (from the coating itself) that can be observed on most coated materials (it is especially noticeable on car paint and many legacy shaders simulate this effect by having a secondary highlight control, which is not physically plausible). Bump mapping can be applied to either/or the coating and the base layer. Additionally, just as any other Maya material it can be used in conjunction with displacement.

 

The 3Delight Material with three group of parameters:
Coating, Base Layer, Subsurface, Transparency and Bump.
The Base Layer is further sub-divided in: Diffuse, Reflection, Anisotropy, Refraction and Incandescence



 

 

 

Coating


On

Specifies wether or not there is a coating on top of the Base layer. Visually, the presence of coating adds the following two phenomenas to the look of the layer:

  1. Adds a sepcular highlight because light can bounce of the smooth surface of the coating.
  2. Adds a light absorption effect. This is especially visible on gazing angles where light travels a longer distance before reacing the viewer.
Color
Color of the coating. This is basically the color of the specular highlight that is seen on the coated surface.
Transmittance
The color of the interior of coating. Light that travels through the coating will be coloured according to transmittance.
Thickness
Thickness of the coating in scene units (world units). For example, when rendering a coated table of 1 meter, a value of 0.001 means a thickness of 1 millimeter.
Roughness
This controls the specular roughness of the coating material. The smaller the value, the smoother is the surface.
Samples
This is the total number of samples to trace in order to sample the scene in the specular direction. The rougher is the material the more samples are needed to avoid undue noise.
IOR
The index of refraction of the coating layer. A value of 1.3 is usual.
Reflect Geometry
Reflect Lights
Reflect Environment
Specifies if the coating reflects the GeometriesLights and Environment respectively. Disabling the reflection of geometries can speedup rendering because no ray-objects intersections are performed. "Reflect Lights" enables or disables specular highlight from point lights.

 

 

 

 

 

Base


Diffuse Color
This diffuse Color of the base material.
Diffuse Roughness
This controls how diffuse is the material. A value closer to one simulate very rough materials such as chalk. A value of 0 renders a standard "lambertian" diffuse. On a more technical note, this paramter controls the roughness of the Oren-Nayer diffuse model.
Reflection Color
Specifies the color of the specular highlight.
Reflection Roughness
This controls the specular roughness of the base layer. The smaller the value, the smoother is the surface.
Reflection Samples
Specifies the total number of samples to trace in order to sample the scene in the specular direction. The rougher is the material the more samples are needed to avoid noise.
Reflectivity
Specifies the degree of reflectivity through a normalised range. This indirectly controls the index of refraction and fresnel that will be used for reflection.
Reflect Geometry
Reflect Lights
Reflect Environment
Specifies if the base coating reflects Geometries, Lights and the Environment respectively. Disabling the reflection of geometries can speedup rendering because no ray-objects intersections are performed. "Reflect Lights" enables or disables specular highlight from point lights.
Anisotropy
Specifies anisotropy "directionality". 0 means no anisotropy. Positive values will increase anisotropy along the anisotropy direction and negative value will increase it along the perpendicular direction.
Anisotropy Direction
Specifies the anisotropy direction in local tangents space.
Refraction Color
The color of the refraction. Setting this color to 0 disables refraction.
Refraction Roughness
Specifies the roughness of the refraction. The smaller the value, the smoother is the surface. Higher values can be used to emulate "ground glass" for example.
Refraction Samples
Total number of refraction samples to trace. The rougher is the refractive material the more samples are needed to avoid noise.
Refraction IOR
Sets the index of refraction in case the base layer is refractive.

 

 


Subsurface

On
Specifies wether or not the material has subsurface light penetration.
Scattering Algorithm
Wether to use Ray Traced subsurface (default) or Point-Based subsurface (legacy, for lower pixel complexity projects which are not geometry intensive).
Scattering
The tint of the light that is scattered inside the material. Visually, this means that the light which penetrates the object far away from its exist point will be tinted by this color. For skin, this would be bluish.
Scattering Scale
Scattering isn't usually confined to the 0..1 range (physically, it is expressed in 1/mm). So to have a use friendly UI in which the scattering can still be expressed as a color, we added a separate scale to control the general amplitude.
Transmittance
Visually, this specifies the color of the light that is diffused nearby the entry point of a light beam. For skin, this would be reddish.
Transmittance Scale
Same as for Scattring Scale but applies for Transmittance.
IOR
The index of refraction of the based layer.
Scale

A global scale that applies to this material. Larger scales will make the object appear more translucent. This is the best way to control how much diffusion goes into the surface. A scale closer to 0 will tend to disable the subsurface scattering effect and the surface will look solid.

Scale 0.05

Scale 0.1

Scale 0.2

Group
This allows many objects, with different materials, share the same "subsurface simulation". For example, two intersecting cubes with different material properties but with the same group name will have correct subsurface intersecting along the intersecting lines.


Transparency


Color
The color of the transparency, this is the actual opacity and is unrelated to refractions.


Bump

 
Layer Selection
Allows you to choose wether to apply bump to the coating, base or both layers (default).
Bump Mapping
A slot to connect a Maya bump2d or nbump3d node, simply click on the texture button to connect a texturing node, the bump node will be created automatically and recognise wether of 2d or 3d type.

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