VRay for 3ds Max Manual

VRayMtl Examples

	The Roughness parameter
	The Reflection color parameter
	The Reflection glossiness parameter
	The Energy preservation mode
	The Fresnel option
	The Anisotropy parameter
	The Anisotropy rotation parameter
	The Refraction color parameter
	The Refraction glossiness parameter
	The Refraction IOR parameter
	The Refraction depth parameter
	The refraction Exit color parameter
	The Fog color parameter
	The Fog multiplier parameter
	The BRDF type

The Roughness parameter

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This example demonstrates the effect of the Roughness parameter. Note how as the Roughness increases, the materials appears more "flat" and dusty.

Roughness is 0.0 (regular diffuse material)	Roughness is 0.3	Roughness is 0.6

The Reflection color parameter

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This example demonstrates how the Reflection color parameter controls the reflectivity of the material. Note that this color also acts as a filter for the diffuse color (e.g. stronger reflections dim the diffuse component).

Reflection color is black (0, 0, 0)	Reflection color is medium grey (128, 128, 128)	Reflection color is white (255, 255, 255)

The Reflection glossiness parameter

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This example demonstrates how the Reflection glossiness and Highlight glossiness parameters control the highlights and reflection blurriness of the material.

Reflection/Hilight Glossiness is 1.0 (perfect mirror reflections)	Reflection/Hilight glossiness is 0.8	Reflection/Hilight glossiness is 0.6

The Energy preservation mode parameter

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This example demonstrates how the Energy preservation mode controls the way reflections dim the diffuse color.

	Reflection color is medium grey (128, 128, 128)	Reflection color is medium green (0, 128, 0)
Energy preservation is RGB
Energy preservation is Monochrome

The Fresnel option

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This example demonstrates the effect of the Fresnel option. Note how the strength of the reflection varies with the IOR of the material. For this example, the Reflection color is pure white (255, 255, 255).

Fresnel is off	Fresnel is on, IOR is 1.3	Fresnel is on, IOR is 2.0	Fresnel is on, IOR is 10.0

The Anisotropy parameter

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This example demonstrates the effect of the Anisotropy parameter. Note how the different values stretch the reflections horizontally or vertically.

Anisotropy is -0.9	Anisotropy is -0.45	Anisotropy is 0.0 (no anisotropy)	Anisotropy is 0.45	Anisotropy is 0.9

The Anisotropy rotation parameter

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This example demonstrates the effect of the Anisotropy rotation parameter. For all the images in this example, the Anisotropy parameter itself is 0.8.

Anisotropy rotation is 0.0 degrees	Anisotropy rotation is 45.0 degrees	Anisotropy rotation is 90.0 degrees	Anisotropy rotation is 135.0 degrees	Bitmapped Anisotropy rotation (map in the upper-right corner)

The Refraction color parameter

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This example demonstrates the effect of the Refraction color parameter to produce glass materials. For the images in this example, the material is with a grey Diffuse color, white Reflection color and Fresnel option on.

Refraction color is black (0, 0, 0) (no refraction)	Refraction color is light grey (192, 192, 192)	Refraction color is white (255, 255, 255)

The Refraction glossiness parameter

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This example demonstrates the effect of the Refraction glossiness parameter. Note how lower Refraction glossiness values blur the refractions and cause the material to appear as frosted glass.

Refraction glossiness is 1.0	Refraction glossiness is 0.9	Refraction glossiness is 0.8

The Refraction IOR parameter

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This example demonstrates the effect of the Refraction IOR parameter. Note how light bends more as the IOR deviates from 1.0. The case when the index of refraction (IOR) is 1.0 produces a transparent object. Note however, that in the case of transparent objects, it might be better to assign an opacity map to the material, rather than use refraction.

Refraction IOR is 0.8	Refraction IOR is 1.0	Refraction IOR is 1.3	Refraction IOR is 1.8

The Refraction depth parameter

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This example demonstrates the effect of the Refraction depth parameter. Note how too low refraction depth produces wrong results. Also, in the last two examples, note how areas with total internal reflection are also affected by the Reflection depth.

Refraction depth is 1 Reflection depth is 5	Refraction depth is 2 Reflection depth is 5	Refraction depth is 4 Reflection depth is 5	Refraction depth is 8 Reflection depth is 5	Refraction depth is 8 Reflection depth is 8

The refraction Exit color parameter

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This example demonstrates the effect of the refraction Exit color parameter. This is mostly useful to show areas of deep refractions in the image, or materials needing higher refraction depth. Note how the red areas are reduced when the Reflection depth and Refraction depth are increased.

Refraction Exit color is off; Reflection depth and Refraction depth are set to 5	Refraction Exit color is on and set to red (255, 0, 0); Reflection depth and Refraction depth are set to 5	Refraction Exit color is on, Reflection depth and Refraction depth are set to 8

The Fog color parameter

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This example demonstrates the effect of the Fog color parameter. Notice how the thick areas of the object are darker in the two images on the right because of the light absorption of the fog.

Fog color is white (255, 255, 255) (no light absorption)	Fog color is grey (243, 243, 243)	Fog color is green (230, 243, 213)

The Fog multiplier parameter

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This example demonstrates the effect of the Fog multiplier parameter. Smaller values cause less light absorption because of the fog; while higher values increase the absorption effect.

Fog multiplier is 0.5	Fog multiplier is 1.0	Fog multiplier is 1.5

The BRDF type

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This example demonstrates the differences between the BRDFs available in V-Ray. Note the different highlights produced by the different BRDFs.

BRDF type is Phong	BRDF type is Blinn	BRDF type is Ward