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This page provides information on the V-Ray Sphere Light.
Overview
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Basic Parameters
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Size
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Example: Size of Lights, Shadows and Intensity
The following images show how the size of a light affects shadows. Bigger lights produce blurrier shadows, while smaller lights produce sharper shadows:
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Notice that when we set the Units to Watts and Lumens the light appears to be of the same intensity. This is because the emitted light does not depend on the size of the light. The other three units depend on the size of the light - larger surfaces emit more light, that is why the intensity of the light increases with the radius of the light source. Note that the Intensity multiplier had to be adjusted for the different units in order to produce similar light intensity in the first images. However the multiplier is the same for each set of three images.
Options
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Sampling
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Shadows
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Decay
The Decay parameters determine how the light fades in and out. The Near decay determines how light fades in. The light isn't at its maximum value at its source, but instead gradually increases until it reaches the Near end. The Far decay determines how light fades out. The light isn't at its maximum value at its end, but instead gradually decreases after the Far decay start.
Decay option is useful for creating hotspots or controlling the length of a "God Rays" effect created with Environment Fog.
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Photon Emission
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UI
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