Example 1: Default Color and Multiplier values

Example 2: Higher Multipliers / 2-sided On and Off

Example 3: Textures

Example 1: Default Color and Multiplier values

Here is a scene rendered with the default VRayLightMtl. These examples demonstrate how the material behaves in V-Ray, and how its parameters influence the overlook of the final results.

 

The white plane is a default VRayLightMtl. The teapot is a default VRayMtl with Reflection. Rest is just VRayMtl with diffuse colors.

Color value: 1.0

No GI

Color value: 50.0

No GI

 

Color value: 1.0

GI on

 

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We are going to render this scene with Default Lights - Off till the end of the example and no lights will be used in it as well.

 

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As you see the image is absolutely dark except

the plane (self-illuminated) and

the reflection on the teapot. Notice we have no GI and no lights at all here, so the dark part of the scene is totally expected and reasonable.

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Notice that nothing changed in general, BUT the reflection on the teapot got stronger due to the higher color value. Rest is still black: because we still have the GI off.

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As You see turning GI on almost didn't change the overlook. That is because of the Color value: 1.0.

It acts mainly as just self-illuminating the object that has the VRayLightMtl.

 

Example 2: Higher Multipliers / 2-sided On and Off

Color value: 5.0

GI on

Emit on Back Side off

Color value: 5.0

GI on

Emit on Back Side on

Color value: 15.0

GI on

Emit on Back Side off

Color value: 15.0

GI on

Emit on Back Side on

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Now You can notice that increasing the Color value has influenced visibly the scene (shadows also appear).

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Scene starting to gather more light because of the 2-sided - on.

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As You see the back is still dark, but You can already notice the blue wall receiving some GI, due to higher Color value. Shadows also appear more defined.

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Scene starting to gather more light because of the 2-sided - on. But we also start to get some burnt areas due to Linear type of Color mapping.

 

Example 3: Textures

This example shows using the VRayLightMtl with a texture in the Color plug. In order to control the strength of the light we will need to adjust the Value of the Color Gain parameter in the Color Balance roll out of the texture.

 

Color Gain Value: 3.0

GI on ;

Emit on Back Side on

IR: HSphS: 100

IR: Interp.S: 40

Exponential

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Using a File texture connected to the Color plug. The Color Gain Value is quite low, so only the plane and the reflection on the teapot are visible.

Color Gain Value: 15.0

GI on ;

Emit on Back Side on

IR: HSphS: 100

IR: Interp.S: 40

Exponential

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Increasing the Color Gain Value leads to a much lighter overlook of the scene. Notice that now the texture is getting closer to white color look, due to multiplying the (R,G,B) values of the texture.

Color Gain Value: 3.0

GI on ;

Emit on Back Side on

IR: HSphS: 100

IR: Interp.S: 40

Exponential

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Here is another File texture connected to the Color plug. Notice that we haven't changed the VRayMtls for the surrounding walls, but the scene looks different from the previous one due to the new texture.

Color Gain Value: 15.0

GI on ;

Emit on Back Side on

IR: HSphS: 100

IR: Interp.S: 40

Exponential

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Increasing the Color Gain Value leads to a much lighter overlook of the scene. Notice now that the texture is getting closer to white color look, due to multiplying the (R,G,B) values of the texture.