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This page provides information on the BRDFCarPaint material node.

Overview

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The V-Ray Car Paint material simulates a metallic car paint. It is a complex material with four layers: a base diffuse layer, a base glossy layer, metallic flakes layer, and clear coat layer. The material allows the adjustment of each of these layers separately.

UI Paths

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Node

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Base

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Double Sided – When enabled, the material is double-sided. Color

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– Specifies the diffuse color for the base layer. Reflection – Specifies the reflectivity of the base layer. The reflection color itself is the same as the Base color. Glossiness – Specifies reflection glossiness for the base layer. Bump Type – Specifies whether a bump map or a normal map effect is added to the base material.  Bump

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– Applies the map as a bump map. Normal (Tangent)

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– Applies the map as a normal map in tangent space. Normal (Object)

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– Applies the map as a normal map in object space. Normal (Camera)

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– Applies the map as a normal map in screen/camera space. Normal (World)

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– Applies the map as a normal map in world space. From Bump

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– The map is applied as determined by map type itself. Explicit Normal

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– Applies the map as an explicit normal. Bump Strength –Controls the strength of the the bump/normal effect on the base layer. Trace Base Reflection

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– Toggles reflections for the base layer Column width 5%   Column width 45% Image Added

 

Coat

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Strength – Specifies the strength of the coat reflections when the surface is viewed directly from the front. Color

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– Specifies the color of the coat layer. Glossiness – Specifies the glossiness of the coat reflections. Bump Type – Specifies whether a bump map or a normal map effect is added to the base material.  Bump

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– Applies the map as a bump map. Normal (Tangent)

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– Applies the map as a normal map in tangent space. Normal (Object)

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– Applies the map as a normal map in object space. Normal (Camera)

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– Applies the map as a normal map in screen/camera space. Normal (World)

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– Applies the map as a normal map in world space. From Bump

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– The map is applied as determined by map type itself. Explicit Normal

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– Applies the map as an explicit normal. Bump Strength – Controls the strength of the the bump/normal effect on the coat layer. Trace Coat Reflections – Toggles reflections for coat layer. Column width 5%   Column width 45% Image Added

 

Flakes

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Mapping Type

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– Specifies the method for mapping the flakes. The possible values are: Explicit

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– The flakes are mapped using the specified channel. Triplanar

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– The material automatically computes mapping coordinates in object space based on the surface normals. Mapping Channel – Specifies the mapping channel for the flakes when the Flake mapping type is set to Explicit mapping channel. Color – Specifies the color of the metal flakes. Glossiness – Specifies the glossiness of the metal flakes. It is not recommended to set this

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above 0.9

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as it may produce artifacts. Orientation – Controls the orientation of the flakes relative to the surface normal. When this

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is 0.0, all flakes are perfectly aligned with the surface. When it

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is 1.0, the flakes are rotated completely randomly with respect to the normal. Values

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above 0.5

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are not recommended as they can produce artifacts.

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For more information, see

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The Flake Orientation Parameter example

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below.  Density

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– Specifies the density (number of flakes) for a certain area. Lower values produce less flakes and higher values produce more flakes. Set this

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to 0.0

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to produce a material without flakes. For more information,

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see The Flake Density Parameter example

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below.  Scale

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– Scales the entire flake structure. For more information,

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see The Flake Scale Parameter

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example below.

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Size

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– Specifies the size of the flakes relative to the distance between them. Higher values produce bigger flakes and lower values produce smaller flakes. For more information,

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see The Flake Size Parameter example

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below.  Map Size

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– Internally the material creates several bitmaps to store the generated flakes. This parameter determines the size of the bitmaps. Lower values reduce RAM usage, but may produce noticeable tiling in the flake structure. Higher values require more RAM, but tiling is reduced. Be careful when using the Directional filtering method, as it may quickly take up gigabytes of RAM for larger map sizes. For more information, see

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the Antialiasing Filters example

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below.  Filtering Mode

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– Determines the way the flakes are filtered. Filtering is extremely important to reduce the work required to produce a clean image. For more information,

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see The Flake Filtering Parameter example

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below. Simple

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– This method is faster and uses less RAM but is less accurate. It averages the orientation of the flakes together, which may alter the appearance of the material when viewed from a distance.  Directional

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– This method is slightly slower and uses more RAM, but is more accurate. It groups the flakes based on their orientation before performing the filtering, so that the material appearance is preserved.   Seed

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– The random seed for the flakes. Changing this produces different flake patterns. Trace Flakes Reflections

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– Toggles reflections for flake layer. Column width 5%   Column width 45% Image Added

 

Options

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Trace Reflections for All

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Layers – When enabled, reflections are traced for all layers of the Car Paint material. Trace Depth – Specifies the number of times a ray can be reflected. Scenes with lots of reflective and refractive surfaces may require higher values to look correct. A value

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of -1

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specifies this option is controlled by the

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global Render Settings. Subdivs – Determines the amount of samples for the glossy reflections of the different layers. Note that this parameter is available for changing only when Use Local Subdivs is enabled in the DMC Sampler. Cutoff

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– Cutoff threshold for the reflections of the different layers. Use Environment Override – Enables the use of the Environment Override color or texture. Environment Override

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– A color or texture that is used as an environment for the material. Environment Priority

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– Specifies the environment override priority when several materials override it along a ray path. Column width 5%   Column width 45% Image Added

 

Anchor
flakeOrientation flakeOrientation

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flakeDensity flakeDensity

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Column width 50% Example: The Flake Orientation Parameter This set of images demonstrate the effect of

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the Orientation

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parameter. Note how lower values produce flakes more aligned with the surface normal, so that light is reflected more uniformly. Higher values produce more random flakes leading to more variation in the flake illumination.

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Column width 20%   60% Column width Image slider startIndex 13 Panel borderStyle none Orientation: 0.0 Panel borderStyle none  Orientation: 0.3 Panel borderStyle none  Orientation: 0.5 Column width 20%

 

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Example: The Flake Density Parameter This set of images shows the effect of

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the Density

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Column width 20%   60% Column width  parameter. Note how larger values produce more flakes, but do not change the flake size.

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width Image slider startIndex 1 Panel borderStyle none Density: 0.5 Panel borderStyle none Density: 1.0 Panel borderStyle none  Density: 2.0 Column 20%

 

 

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flakeScale flakeScale

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flakeSize flakeSize

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Column width 50% Example: The Flake Scale Parameter This set of images demonstrates the effect of

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the Scale

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parameter. Note how lower values scale the entire flake structure.

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column Column width 60% width 20%   Image slider startIndex 1 Panel borderStyle none  Scale: 0.01 Panel borderStyle none Scale: 0.04 Panel borderStyle none Scale: 0.08 Column width 20%50%   Image slider

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startIndex

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3 Example: The Flake Size Parameter This set of images shows the effect of the Size

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parameter. Note how larger values make the individual flakes larger, but do not change their count.

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Column width 20%   column Column width 60% 1 Image slider startIndex Panel borderStyle none Size: 0.5 Panel borderStyle none Size: 1.0 Panel borderStyle none Size: 2.0

 

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Anchor

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flakeFiltering

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flakeFiltering

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flakeFilteringflakeMapSizeflakeFiltering flakeMapSize

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Column width 50% Example: The Filtering Mode Parameter This example shows the effect of

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Column width 20%   Column width 60% the Filtering Mode

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parameter. Image slider startIndex 4 Panel borderStyle none  Filtering Mode: Simple no anti-aliasing Panel borderStyle none Filtering Mode: Directional no anti-aliasing Panel borderStyle none The flake orientation gets averaged, altering the appearance. The material transitions more abruptly from dark to light with the flakes appearing brighter and nosier. Panel borderStyle none The material appearance is correctly preserved due to the higher filtering accuracy. Column width 20%

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Example: Anti-aliasing Filters Here is an example briefly demonstrating the effect of different anti-aliasing filters on the final result. Note that rendering with a particular filter

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is not the same as rendering without a filter and then blurring the image in a post-processing program like Adobe Photoshop. Filters are applied on a sub-pixel level, over the individual sub-pixel samples. Therefore, applying the filter at render time produces a much more accurate and subtle result than applying it as a post effect.

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Section

Column width 20%   60% Column width Image slider Panel borderStyle none  Filtering Mode: Simple   Map Size: 256 Flake maps take less than 1 MB Panel borderStyle none  Filtering Mode: Simple   Map Size: 512 Flake maps take between 1 and 2 MB Panel borderStyle none  Filtering Mode: Simple  Map Size:1024 Flake maps take 5 MB Panel borderStyle none Filtering Mode: Simple Map Size: 2048 Flake maps take 21 MB Panel borderStyle none Filtering Mode: Directional Map Size:256 Flake maps take 10 MB Panel borderStyle none Filtering Mode: Directional Map Size:512 Flake maps take 40 MB Panel borderStyle none Filtering Mode: Directional Map Size:1024 Flake maps take 161 MB Panel borderStyle none  Filtering Mode: Directional  Map Size: 2048 Flake maps take 645 MB Column width 20%

Notes

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