mib_blackbody

| SDK Property Set

Category: mental ray > Light

Shader Family: Light

Output: Color

The mib_blackbody light shader utility is used to determine a color for a light source. It is connected to the color parameters of other light shaders.

A material that absorbes all light directed at it is called a blackbody, since it is devoid of any color. However, every material, when sufficiently heated, will also emit electromagnetic radiation. For a blackbody the spectral distribution of this radiation depends solely on the temperature of the material, and on no other material property. There is a specific color associated with each temperature of such a body. With increasing temperature this color ranges from red over white to blue. Note that the intensity of this radiation will also increase strongly with temperature - an effect that is ignored here by normalizing the color to a provided intensity.

Name

The name of the shader node displayed in the render tree. Enter any name you like, or leave the default.

temperature

The temperature in degree Kelvin to be used for the calculation of the blackbody radiation spectrum. The smallest temperatures provided should be near 1000 Kelvin.

intensity

The shader only computes the color corresponding to the provided temperature, but it does not compute the associated intensity. Instead this intensity parameter is used (the shader only computes the color corresponding to the provided temperature, but it does not compute the associated intensity. Instead this intensity parameter is used (the default value is 1).

 



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