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The Plane, Disc, and Sphere are each a type of VRayLight with similar options.
Overview
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Plane, Disc, and Sphere lights are types of VRayLight objects. These are good general-purpose V-Ray lights for lighting scenes to simulate real-world light sources like lamps and ceiling lights.
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Sample Uses
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By default, V-Ray renders the light source if it is seen in the camera, as shown in the examples below. To render without seeing the light source, enable the light's lnvisible option.
Note: When a Plane, Disc, or Sphere light is visible in the rendering, aliasing at the edges of the light source can occur. Lens Effects such as the Bloom Effect (as used in the example images below) and Glare Effect are one way to hide the aliasing, while another is the use of a VRaySoftBox map. For information on the cause of the aliasing and solutions for it, see Notes below.
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Parameters - General Rollout
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The following images show how the size of a Sphere light source affects shadows. Larger light sources produce blurrier shadows, while smaller light sources produce sharper shadows:
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Example: Light Size and Intensity
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The same is not true for other Units settings. With the Default (image), Luminance (lm/m²/sr) and Radiance (W/m²/sr) settings, the light's intensity is directly affected by the size of the light source.
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Parameters - Rectangle/Disc Light Rollout
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Example: Directional Spread
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The Directional parameter controls the spread of the Plane or Disc light. A value of 0 produces the maximum spread of light in all directions as seen in figure 1, while a value of 1 creates a narrow light beam as seen in figure 3.
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Plane light with Directional = 0, 0.5, 1.0
Preview = Always
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The following example shows the effect of the Directional parameter. Note that the plane light itself appears to turn black as the value gets closer to 1.0. This is due to the simplified directional distribution. The light is forced only in the forward direction, so the plane appears dark when viewing it from the side. This phenomenon does not occur with real-world lights because they exhibit more complex directional distribution.
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Parameters - Options Rollout
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Example: Single-Sided vs Double-Sided Lights
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This example demonstrates how a Plane light is affected when the Double-sided option on the Options rollout is enabled or disabled. The light is pointed away from the hallway.
The VRayLight in the viewport.
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Parameters - Sampling Rollout
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Parameters - Decay Rollout
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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 start.
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Preview Gizmo
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Parameters - Viewport Rollout
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Example: Intensity Rays
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Notes
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