Stefan Röttger

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For the optical model of emission and absorption we use alpha-blending instead of the maximum blend function. Here the emission is the RGB part of the fragment colors and the absorption is equivalent to the opacity A of the fragment colors.

Emission alone (order independent):

Absorption alone (order independent):

Emission plus absorption (order dependent):

Compared to MIP (order independent):

Emission and Absorption is achieved via Alpha-Blending:

In this context the emission corresponds to the RGB-channels and the absorption corresponds to the alpha-channel of the actual rendered fragment color.

For more information the interested reader is referred to the Volume Rendering Lecture.

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