A student who changes the course of history is
probably taking an exam.

Concept 4.4 : Material - Specularity
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Idea:
=====
GLfloat mat_specular[] = {red, green blue, alpha};
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
specifies the specular highlight produced by an object.

Unlike ambient and diffuse reflection, the amount of 
specular reflection seen by a viewer does depend on the
location of the viewpoint.