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Table of Contents maxLevel 3 style circle
Overview
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UI Path: ||Toolbar|| > V-Ray menu icon > Materials > VRayMtl
Inputs
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The following parameters can be mapped with textures. To enable the input in the Node Graph, enable the tickbox next to the corresponding slider in the Properties pane.
Diffuse
Roughness
Opacity
Self-Illumination
Reflection Color
Reflect Glossiness
Anisotropy
Refraction Color
Refraction Glossiness
Translucency Color
Main Parameters Tab
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Diffuse Color – The diffuse color of the material. Note: the actual diffuse color of the surface also depends on the reflection and refraction colors.
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Options Rollout
Double sided – When enabled, V-Ray will flip the normals for back-facing surfaces with this material assigned. Otherwise, the lighting on the "outer" side of the material will be computed always. You can use this to achieve a fake translucent effect for thin objects like paper.
Reflect on back – When disabled, V-Ray will calculate reflections for the front side of objects only. Checking it will make V-Ray calculate the reflections for the back sides of objects too.
Glossy Fresnel – When enabled, uses glossy Fresnel to interpolate glossy reflections and refractions. It takes the Fresnel equation into account for each "microfacet" of the glossy reflections, rather than just the angle between the viewing ray and the surface normal. The most apparent effect is less brightening of the grazing edges as the glossiness is decreased. With the regular Fresnel, objects with low glossiness may appear to be unnaturally bright and "glowing" at the edges. The glossy Fresnel calculations make this effect more natural.
Use Roughness – When enabled, highlights/reflections will be determined by the material's Roughness, otherwise highlights/reflections will be determined by the material glossiness.
Fix dark edges – Enabling will fix dark edges that sometimes appear on objects with glossy materials.
Cutoff Threshold – This is a threshold below which reflections/refractions will not be traced. V-Ray tries to estimate the contribution of reflections/refractions to the image, and if it is below this threshold, these effects are not computed. Do not set this to 0.0 as it may cause excessively long render times in some cases.
Glossy rays as GI – Specifies on what occasions glossy rays will be treated as GI rays:
Never – Glossy rays are never treated as GI rays.
GI rays only – Glossy rays will be treated as GI rays only when GI is being evaluated. This can speed up rendering of scenes with glossy reflections and is the default.
Always – Glossy rays are always treated as GI rays. A side effect is that the Secondary GI engine will be used for glossy rays. For example, if the primary engine is irradiance map, and the secondary is light cache, the glossy rays will use the light cache (which is a lot faster).
Energy mode – Determines how the diffuse, reflection, and refraction color affect each other. V-Ray tries to keep the total amount of light reflected off a surface to be less than or equal to the light falling on the surface (as this happens in the real life). For this purpose, the following rule is applied: the reflection level dims the diffuse and refraction levels (a pure white reflection will remove any diffuse and refraction effects), and the refraction level dims the diffuse level (a pure white refraction color will remove any diffuse effects). This parameter determines whether the dimming happens separately for the RGB components or is based on the intensity:
Color – Causes dimming to be performed separately on the RGB components. For example, a pure white diffuse color and pure red reflection color will give a surface with cyan diffuse color (because the red component is already taken by the reflection).
Monochrome – Causes dimming to be performed based on the intensity of the diffuse/reflection/refraction levels.
Use input format from – Sets the material aspect ratio based on the input format of a connected texture file. This only affects 2D Card nodes that have image aspect enabled.
Opacity mode – Controls how the opacity map works. For more information, see the Opacity mode parameter example below.
Normal – The opacity map is evaluated as normal: the surface lighting is computed and the ray is continued for the transparent effect. The opacity texture is filtered as normal.
Clip – The surface is shaded as either fully opaque or fully transparent depending on the value of the opacity map (i.e. without any randomness). This mode also disables the filtering of the opacity texture. This is the fastest mode, but it might increase flickering when rendering animations.
Stochastic – The surface is randomly shaded as either fully opaque or fully transparent so that on average it appears to be with the correct transparency. This mode reduces lighting calculations but might introduce some noise in areas where the opacity map has gray-scale values. The opacity texture is still filtered as normal.
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Example: Opacity mode parameter
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The renders below show a blow-up of the tree to better show the effect of the different modes. Note that in the first two renders the opacity is blurry because of the texture filtering.
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Reflection Parameters Tab
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The BRDF parameter determines the type of the highlights and glossy reflections for the material. This parameter has an effect only if the reflection color is different from black and reflection glossiness is different from 1.0.
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Phong – Phong highlight/reflections.
Blinn – Blinn highlight/reflections.
Ward – Ward highlight/reflections.
GGX – GGX highlight/reflections.
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GGX is the most modern and flexible BRDF(Bidirectional reflectance distribution function) type and is able to better represent a broad range of materials thanks to its ability to control the shape of the specular lobe. There currently isn't any particular performance difference between models and there is little reason to choose any of the other types.
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Reflection Color – Specifies the reflection color. Note that the reflection color dims the Reflection Color – Specifies the reflection color. Note that the reflection color dims the diffuse surface color. For more information, see The Reflection Color Parameter example below.
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Anisotropy Rollout
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Anisotropy – Determines the shape of the highlight. A value of 0.0 means isotropic highlights. Negative and positive values simulate "brushed" surfaces. For more details, please see The Anisotropy Parameter example below.
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Refraction Parameters Tab
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Refraction Color – Refraction color. Note that the actual refraction color depends on the reflection color as well. For more information, see The Refraction Color Parameter example below.
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