Vray Tutorial
This extra module discusses the IES Light - A light source that allows us to introduce real world lights into the scene. Lighting manufacturers sometimes provide .ies files which hold photometric data for the lights they manufacture. You can use a V-Ray IES Light to load those files and have the physically accurate illumination in SketchUp.
Intensity - usually the IES file holds information about the actual intensity of the light. However, this value can be overridden
IES Light File - a slot for the .ies light profile
Shape - specifies how the light shape is determined for the purposes of calculating soft shadows.
From IES file - uses the shape information (when available) saved in the .ies file
Point - the light is considered as a point - only can create sharp shadows
Circle - the light shape is a circular plane, the normal of the plane is the direction of the light and the diameter of the circle is determined by the Diameter parameter
Sphere - the light shape is a sphere, the size of which depends on the Diameter parameter
Diameter - controls the softness of the shadows generated by the IES Light when the Shape parameter is set to either Circle or Sphere. Larger values make for softer shadows
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