ARUP; ISBN: 978-0-9562121-5-3 - CMBBE 2012 - Cardiff University

endering loop is started and the ray resume positions stored in the previous iteration are used as
new starting points for the rays, while the accumulated color to this point is used as a start value
for the compositing.
5. CONCLUSIONS AND FUTURE WORK
We have introduced a tool and methodologies surrounding chronophotographic visualization, and
simplified the method by which a four dimensional volume renderer would be used.
Identifying the timesteps of interest is a complicated process. We allow arbitrary mappings from
timesteps to emphasis in the final visualization as a separate step from transfer function
generation. This greatly simplifies the interface over a 4D transfer function.
Finally, we discussed parallel-aware methods by which one can implement this technique.
6. REFERENCES
1. Geneser, S.E., Hinkle, J.D., Kirby, R.M., Wang, B., Salter, B., Josh, S., Quantifying
variability in radiation dose due to respiratory-induced tumor motion, Medical Image
Analysis, Volume 15, Issue 4, August 2011, Pages 640-649, ISSN 1361-8415,
10.1016/j.media.2010.07.003.
2. Woodring, J., Wang, C., Shen, H-W., High Dimensional Direct Volume Rendering of
Time-Varying Data, Proceedings of the 14th IEEE Visualization 2003 (VIS’03), 55-,
2003.
3. van Wijk, J., van Liere, R., HyperSlice: Visualization of Scalar Functions of Many
Variables, Proceedings of the 4th Conference on Visualization, pp. 119-125, 1993.
4. Mascarenhas, A., Snoeyink, J., Isocontour based Visualization of Time-varying Scalar
Fields, Mathematical Foundations of Scientific Visualization, Computer Graphics, and
Massive Datasets, 2009.
5. Bajaj, C.L., Pascucci, V., Rabbiolo, G., Schikorc, D., Hypervolume Visualization: a
Challenge in Simplicity, Proceedings of the 1998 IEEE Symposium on Volume
Visualization, pp. 95-102, 1998.
6. Jankun-Kelly, T., Ma, K.-L. A Study of Transfer Function Generation for Time-varying
Volume Rendering, In Proceedings of 2001 International Workshop on Volume Graphics,
pp. 51–65, 2001.
7. Bernardon, F., Ha, K., Callahan, S., Comba, J., Silva, C., Transfer-Function Specification
for Rendering Disparate Volumes, in Computing in Science and Engineering, volume 10,
pp. 82-89, 2008.
8. Fogal, T., Krüger, J., Tuvok, an Architecture for Large Scale Vol
ume Rendering, Proceedings of the 15th International Workshop on
Vision, Modeling, and Visualization. 2011
9. Krüger, J. Westermann, R., Acceleration Techniques for GPU-based Volume Rendering,
Proceedings of the 14th IEEE Visualization, pp. 38-- 2003.
10. Stegmaier, S., Strengert, M., Klein, T., Ertl, T. A Simple and Flexible Volume Rendering
Framework for Graphics-Hardware-Based Raycasting, Proceedings of the 4th
International Workshop on Volume Graphics, pp. 187-241, 2005.