| volume rendering: emphasizing material boundaries [message #33312] |
Mon, 16 December 2002 09:28 |
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s[1]
Messages: 21
Registered: December 2002
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Junior Member |
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Hi all,
I try to volume render a MRI brain data set like the one in the demo. I
want the brain matter to be rendered very translucently (because I want to
see the polygons I put inside the brain) but at the same time I want to
emphasize surfaces and material boundaries.
At a surface, the gradient in the data set usually is very high. So I am
looking for a way to tell IDL to prominently factor the gradient into the
rendering equation. In VTK I can use a "gradient opacity" transfer
function, which basically weights the opacities by the
gradient, i.e. even highly opaque voxels are rendered very transparently
if their gradient is low.
Is there a build-in way to achieve this effect in IDL?
I thought about using the lights for this (spot light with high focus),
but that doesn't do the trick.
Thanks for all tips,
Sebastian
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