Autodesk 12812-051462-9011 User Guide 3 - Page 734

Specular Click the color swatch to display a Color Selector and change the color of mirror reflections. When the specular color is white, the material is 100 percent reflective, like a mirror. When the specular color is black, the material does not reflect any of its surroundings. Shiny Sets the width of glossy highlights. The larger this value, the smaller the highlights. Default=30.0. Transparency Specifies the transparency. The effective range of Transparency is from 0.0 to 1.0. At 0.0 the material is fully opaque. At 1.0 it is fully transparent. Default=0.0. WARNING You can set the value of Transparency to be greater than 1.0, but this has no effect. An anomaly of the user interface for shaders in the mental ray and lume libraries, is that spinner values are not "clamped" to lie within their effective ranges, as they are for controls in 3ds Max. The value of Transparency also indirectly specifies the reflectivity of the material, which is calculated as 1.0 minus the Transparency value. Index Of Refraction Specifies the IOR. In the physical world, the IOR results from the relative speeds of light through the transparent material and the medium the eye or the camera is in. Typically this is related to the object's density. The higher the IOR, the denser the object. Default=1.5. See Extended Parameters Rollout (Standard Material) on page 5408 for a list of IOR values for commonly encountered materials. NOTE When the IOR equals 1.0, there is no refraction, and calculating the transparency can take less time than when the material is refractive. Lights When on, the material is illuminated only by those lights specified in the list. When Lights is turned off, all lights in the scene affect the material. Default=off. The remaining light controls are unavailable unless Lights is turned on. ■ List of lights Displays the lights you have chosen to illuminate this material. ■ Add Adds a light to the list. Click Add to turn it on, then click the light object in a viewport. ■ Replace Replaces a light in the list. Highlight a light's name in the list, click Replace to turn it on, then click the replacement light object in a viewport. mental ray Shaders | 5989