This page provides information on the Extra Texture render element.
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UI Path: ||Render Settings window|| > Render Elements tab > Extra Tex
The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.
Enabled – The render element will be generated.
Deep output – Specifies whether to include this render element in deep images.
Filename suffix – Appends this value to the name of the channel, followed by the name of the connected texture when an explicit channel name is not specified.
Type – Specifies the type of texture that will be used for rendering the extraTex channel.
Texture– Allows a bitmap or a procedural texture to be connected.
Float texture – The extraTex will produce a floating-point number that masks each object. Connect a vrayUserScalar texture to read custom floating values from vrayUserAttributes per object. Alternatively, some types of geometry can generate or receive custom float values that can also be passed to VRayExtraTex with vrayUserScalar. This is mostly used in compositing package scripts for find-by-id masking. Filtering and AA do not affect VRayExtraTex in this mode. For more information, see the Notes section.
Int texture – The extraTex will produce an integer number that masks each object. Connect a vrayUserInteger texture to read custom integer values from vrayUserAttributes per object. Alternatively, some types of geometry generate or receive custom integer indices that can also be passed to VRayExtraTex with vrayUserInteger. This is mostly used in compositing package scripts for find-by-id masking. Filtering and AA do not affect VRayExtraTex in this mode. For more information, see the Notes section.
Consider for Anti-Aliasing – When enabled, anti-aliasing will be used where possible.
Affect Matte Objects – Sets whether to include matte objects when generating the render element. A matte object is an object that has been assigned a Wrapper Material or VRayObjectProperties with the Matte surface option enabled.
Explicit channel name – Specifies an explicit name for the generated image channel.
Exclude list – Specifies a set of objects to be excluded from the extraTex channel.
Exclude list as inclusive set – Inverts the effect of the Exlude List parameter, making it an inclusive set.
Ambient Occulsion from Extra Texture pass
Object Normals from Extra Texture pass
Common Uses - Relighting With the World Point Position and Bump Normals
Bump Normals and World Positions Render Elements are is useful for changing the appearance of lighting in a scene in a composite without the need for re-rendering. The example below is a lighting workflow that is used at a composite level to change the lighting in the scene. Note that it does not create any extra shadowing or GI. While the Bump Normal Render Element provides information about how lights will affect each surface; the Point Position element passes the spacial location of each pixel. When used together it allows lights added in composite to react on the pixels as if they were the surface of the model.
Common Uses - UV Element Retexturing
By using Maya's SamplerInfo texture with Extra tex, a Render Element can be created to replace objects texture during compositing without the need to re-render the scene.
Common Uses - Ambient Occlusion
VRayDirt is useful for changing the appearance of a render in a compositing or image editing software.
Beauty Composite with VRayDirt composited over in multiply mode