September 2018
Intermediate to advanced
472 pages
15h 36m
English
Content preview from OpenGL 4 Shading Language Cookbook - Third Edition
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How it works...
The SpotLightInfo structure defines all of the configuration options for the spotlight. We declare a single uniform variable named Spot to store the data for our spotlight. The Position field defines the location of the spotlight in eye coordinates. The L field is the intensity (diffuse and specular) of the spotlight, and La is the ambient intensity. The Direction field will contain the direction that the spotlight is pointing, which defines the center axis of the spotlight's cone. This vector should be specified in camera coordinates. Within the OpenGL program, it should be transformed by the normal matrix in the same way that normal vectors would be transformed. We could do so within the shader; however, within the shader, ...
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