On – Turns the VRayLight on and off. Type – Specifies the shape and function of the light: Plane – The VRayLight takes the shape of a planar rectangle. See the Plane, Disc, Sphere Light page. Sphere – The VRayLight has the shape of a sphere. See the Plane, Disc, Sphere Light page. Dome – The VRayLight emanates from a virtual hemispherical or spherical dome larger than the scene extents regardless of the Dome light icon's size. The light emanates from above the Z-axis of the light, where the light source actually surrounds the entire scene. Additional parameters specifically for this light are under the Dome light rollout. A dome light is commonly used with a texture to produce image-based lighting. Mesh – Allows the usage of any mesh object as the shape of the light. See the Mesh Light page. Disc – The VRayLight takes the shape of a planar disc. See the Plane, Disc, Sphere Light page. Targeted – When enabled, a separate target object is attached to the light source. This target object can be moved separately from the light source, making it easier to point the light within the scene. The value specifies the distance from the light source to the target. While any type of VRayLight can have a target, the target is truly useful only with Plane and Disc lights. This option can be changed only on the Modify tab. Radius – The radius of the Finite dome light. This option is only available when the Finite dome option is enabled. Proj height – Offsets the height of the environment map projection. This option is only available when the Finite dome option is enabled. Ground blend – Controls the transition between the ground plane and the hemispherical upper part of the Finite dome. A value of 0.0 means a sharp transition, whereas a value of 1.0 means that the dome morphs into a sphere. Intermediate values blend between the two. This option is only available when the Finite dome option is enabled. Units – Specifies the light units. Using correct units is essential when you work with the VRayPhysicalCamera. The light automatically takes the scene's unit scale into consideration to produce the correct result for the scale you are working with. The possible values are: Default (image) – The color and multiplier directly determine the visible color of the light without any conversion. The light surface appears with the given color in the final image when seen directly by the camera (assuming there is no color mapping involved). Luminous power (lm) – Total emitted visible light power measured in lumens. When this setting is used, the intensity of the light does not depend on its size. A typical 100W incandescent light bulb emits about 1500 lms of light. Luminance (lm/m²/sr) – Visible light surface power measured in lumens per square meter per steradian. When this setting is used, the intensity of the light depends on its size. Radiant power (W) – Total emitted visible light power measured in watts. When using this setting, the intensity of the light does not depend on its size. Keep in mind that this is not the same as the electric power consumed by a light bulb for example. A typical 100W light bulb only emits between 2 and 3 watts as visible light. Radiance (W/m²/sr) – Visible light surface power measured in watts per square meter per steradian. When this setting is used, the intensity of the light depends on its size. Multiplier – Multiplier for the light color, and also the light intensity for some Units settings. Mode – Specifies the mode in which the color of the light is determined: Color – When selected, the Color swatch specifies the color of the light rays and of the light source itself when visible in renderings. For Units settings other than Default (image), this color is normalized so that only the color hue is used. Temperature – When selected, the color of both light rays and the light source itself is specified by the Temperature value expressed in Kelvin. Map – Enables the use of a texture for the light surface. The button selects the map to use. The texture intensity is also affected by the Multiplier value. |