15-462 Lecture 14: Rasterization

03/13/2003

15-462 Graphics I

45

Depth Cueing and Fog

•Another application of blending

•Use distance-dependent (z) blending

–Linear dependence: depth cueing effect

–Exponential dependence: fog effect

–This is not a physically-based model

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•[Example: Fog Tutor]

GLfloat fcolor[4] = {...};

glEnable(GL_FOG);

glFogf(GL_FOG_MODE; GL_EXP);

glFogf(GL_FOG_DENSITY, 0.5);

glFogfv(GL_FOG_COLOR, fcolor);