Computer Graphics Programming in OpenGL with Java by V. Scott Gordon & John Clevenger

Author:V. Scott Gordon & John Clevenger [V. Scott Gordon & John Clevenger]
Language: eng
Format: epub
Publisher: Mercury Learning and Information
Published: 2018-02-09T05:00:00+00:00

ADS RGBA values for a few other materials are given in Figure 7.3 (from [BA16]).

Sometimes other properties are included in the material properties. Transparency is handled in the RGBA specifications in the fourth (or “alpha”) channel, which specifies an opacity; a value of 1.0 represents completely opaque and 0.0 represents completely transparent. For most materials it is simply set to 1.0, although for certain materials a slight transparency plays a role. For example, in Figure 7.3, note that the materials “jade” and “pearl” include a small amount of transparency (values slightly less than 1.0) to add realism.

Emissiveness is also sometimes included in an ADS material specification. This is useful when simulating a material that emits its own light, such as phosphorescent materials.

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