Photometric lights utilize an .ies file which contains the distribution profile for the light. An .ies file contains complete specifications of a real-world light bulb or tube, including the shape of the light's cone and the steepness of the light's falloff. Such files are usually provided by the manufacturer of the real-world bulb, and the information in those files, gathered through lab experiments, is extremely accurate in its representation of the light source. By loading an .ies file, the light's properties are recreated within Cinema 4D and used by V-Ray during rendering.
IES lights are particularly useful for architectural interior renderings, where it can be important to show an accurate representation of the use of specific man-made light sources in the scene.
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UI Path: ||V-Ray|| > V-Ray Lights > IES Light
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IES Light Shape – Determines the shape of the light when calculating Soft Shadows. By default, the V-Ray IES Light uses the shape information stored in the .ies file. Overrides for the light shape can be specified from the list below.
From IES File Point Rectangular Circular Sphere Vertical cylinder Horizontal cylinder oriented along lum. length Horizontal cylinder oriented along lum. width Ellipse oriented along luminaire length Ellipse oriented along luminaire width Ellipsoid oriented along luminaire length Ellipsoid oriented along luminaire width Elliptic cylinder Hor. elliptic cylinder along lum. length Hor. elliptic cylinder along lum. width Vertical Circle Vertical Ellipse Cuboid
Scale Multiplier – Specifies a multiplier for the size of the light when Light Shape is set to From IES File.
Width – Specifies the width for applicable Light Shape types.
Length – Specifies the length for applicable Light Shape types.
Height – Specifies the height for applicable Light Shape types.
Diameter – Specifies the diameter for applicable Light Shape types.
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Project is used to create a list of objects that can be excluded (or included) from the light's effects, such as illumination or shadow casting.
Mode – Specifies whether the objects in the list are considered included or excluded from the light's effects.
Objects – Creates a list of objects to be excluded or included. When an object is added to the list, theicons appear, which determine how the light affects the object. Theicon controls whether the emitted light affects the object. Theicon controls whether the shadows caused by the light affect the object. Thedetermines whether the object's children are affected.
