Comparasion between [Yagel, Shi ‘93] and [Gudmundsson, Randen ‘90]

• [Gudmundsson, Randen ‘90] have image degradation can only support first opaque ray traversal.

• [Yagel, Shi ‘93] no image degradation and independent of the image composition equation.

• [Gudmundsson, Randen ‘90] accelerates just rotation.

• [Yagel, Shi ‘93] accelerates rotation and change in the shading parameters.

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