YON's Volume Rendering Page

Various bits and pieces with out enough meta...
image vizwcort.jpg
This is an RGBA volume data set downsampled from the Visible Woman
CT Body
CT Body rendered as a Very Large Image 5440x3k

Volume Rendering for 3D GEEKs

VolumePro Product page at TeraRecon (gen3 is still made, but not marketed externally)

VolumePro Timeline - Started as a research project at MERL, then spun out to RTViz and then aquired by TeraRecon. We are working on the 3rd generation ASIC.

H. Pfister, J. Hardenbergh, J. Knittel, H. Lauer, and L. Seiler. The volumepro real-time ray-casting system. In Proceedings of SIGGRAPH 99, pages 251--260, August 1999. MERL TechReport and SIGGRAPH99 Paper DOI=http://doi.acm.org/10.1145/311535.311563

The VolumePro 1000 was described in a paper at I3D by Yin Wu, Hugh Lauer, et al.
Wu, Y., Bhatia, V., Lauer, H., and Seiler, L. 2003. Shear-image order ray casting volume rendering. In Proceedings of the 2003 Symposium on interactive 3D Graphics (Monterey, California, April 27 - 30, 2003). SI3D '03. ACM Press, New York, NY, 152-162. DOI=http://doi.acm.org/10.1145/641480.641510

image litegood.jpg

Emissive Clip Planes for Volume Rendering

image coloncut.jpg
Cutting thru homogeneous material gives
crazy small gradients to confuse viewer.
image colemisv.jpg
Placing an emissive cutplane over the noise
allows lighting the true surfaces.
image fig3_400.jpg
SIGGRAPH 2004 Poster
image may14a.jpg
Cap: may14a.jpg

fMRI Visualization

poster thumbnail
Integrated 3D Visualization of fMRI and DTI Tractography

image fig1_400.jpg
Good overview shot
image litegood.jpg
Two images, one totally emissive, one lit.
Our brain is wired for "shape from shading"
geo colt
Geophysical data is volume data.


Front to Back blending is possible with a buffer to accumulate alpha. The normal back to front blending:

ColorAccum   = (1 - OpacityNew)*ColorAccum + ColorNew
OpacityAccum = (1 - OpacityNew)*OpacityAccum + OpacityNew

Front to Back

ColorAccum   = (1 - OpacityAccum)*ColorNew + ColorAccum
OpacityAccum = (1 - OpacityAccum)*OpacityNew + OpacityAccum

A coherent projection approach for direct volume rendering.
Jane Wilhelms (R.I.P. 2005), Allen Van Gelder: SIGGRAPH 1991: 275-284

Whiz kids wanted. What are there so few Pythagorean solids? If you understand the question, let me know.

See ALSO: dtifmri.htm <> emissive.htm <> fmriviz.htm <> fmrivizo.htm <> hips2.htm <> images.htm <> poster02.htm

last: 2016-11-28 - YON P.S. Got kids with big questions? See YIAMUU