16 lines
691 B
Text
16 lines
691 B
Text
http://www.cs.cmu.edu/afs/cs/academic/class/15462-s09/www/lec/13/lec13.pdf
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Eye/Primary rays: from camera into scene
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Shadow rays: rays from surface intersection point toward light source
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Reflection rays: from surface intersection point in mirror direction
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Transmission rays: from surface intersection point in refracted direction
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Algorithm:
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- Send ray from camera through each pixel into scene
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- Compute point of closest intersection with scene object
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- Shade that point by computing shadow rays
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- Spawn reflection and refraction/transmission rays and recurse
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When do we stop tracing?
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- When the ray leaves the scene
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- When the ray's contribution becomes too small
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