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Most rendering algorithms deliberately employ approximations and other short cuts out of efficiency considerations. The frequent misuse or over-expectations of such methods, far from being common coding errors, give rise to images which exhibit characteristic and easily identifiable artifacts. This paper classifies the best-known varieties; a companion set of figures is provided as an aid to their identification.
illumination, polygon, ray tracing, reflection, shading, shadows.

M. Ouellette, A. Woo and A. Pearce, "It's Really Not a Rendering Bug, You See ...," in IEEE Computer Graphics and Applications, vol. 16, no. , pp. 21-25, 1996.
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