Maximum Intensity Projection
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The so called “Maximum Intensity Projection” determines for each viewing ray the maximum of the occuring emissions (not observable in reality).
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Using Ray-Casting:
Sampling the volume along each viewing ray r(s) parametrized by the viewing distance s.
For each sampling step: $I'=max(V(r(s)),I)$.
Using View Aligned Slices:
Simulate the MIP by rendering each slice with maximum blend function:
$RGB_{frame}' = max(RGB_{fragment},RGB_{frame})$
glBlendEquation(GL_MAX_EXT);
glEnable(GL_BLEND);
Note: MIP is order independent.
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