Bubble Simulation for the Hysteroscopy Simulator

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Presentation transcript:

Bubble Simulation for the Hysteroscopy Simulator Michel Estermann Eveline Mattle Februar 2006

VR in Medicine Homework Contents Hysteroscopy Simulator Bubbles Forces acting on a bubble Velocity of a bubble Results Discussion and Conclusions VR in Medicine Homework

Hysteroscopy Simulator VR in Medicine Homework

Hysteroscopy Simulator VR in Medicine Homework

VR in Medicine Homework Bubble Model: Sphere with radius r Generation: Bubblepool Randomly generated size During cutting Display: Billboarding VR in Medicine Homework

Forces acting on a Bubble Buoyancy Gravity Forces between two bubbles Repelling force Viscous force Forces between bubbles and objects Influence of the Fluid velocity on a bubble VR in Medicine Homework

VR in Medicine Homework Velocity of a bubble Because it is assumed, that the bubbles have no mass the sum of all the forces has to be zero. Some of the forces are dependent of the velocity of the bubbles, so a equation for the velocity can be found. With the velocity the position of the bubbles can be calculated discretely. VR in Medicine Homework

VR in Medicine Homework Results VR in Medicine Homework

VR in Medicine Homework Results Several assumptions and approximations used in this work leads to certain limitations: Large velocity changes between update-steps possible Considering time for independence of computation time No deformation of bubbles No fusion of bubbles Difficulties to find the right parameters Current implementation: no interaction with the objects VR in Medicine Homework

Discussion and Conclusions Because the bubbles interact now with themselves and with the fluid around them the simulation looks more realistic. Because of the Buoyancy an important information about the orientation is given. Next step: implement the interaction of the bubbles with the objects. VR in Medicine Homework

VR in Medicine Homework References [1] (2005) –hysteroscopy simulator website. Available: http://www.hystsim.ethz.ch [2] S.T. Greenwood and D. H. House, “Better with bubbles: Enhancing the visual realism of simulated fluid”, in SCA ’04: Proc. Of the 2004 ACM SIGGRAPH/Eurographics symposium on Computer animation. New York, NY, USA: ACM Press, 2004, pp. 287-296 [online]. Available: http://portal.acm.org/citation.cfm?id=10028562 [3] H. Kueck, C. Vogelsang, and G. Greiner, “Simulation and rendering of liquid foams”, Proc. Graphics Interface ’02, pp.81-88, 2002. [Online]. Available: http://www.graphicsinterface.org/proceedings/2002/145/ [4] D. J. Durian, “Foam mechanics at the bubble scale”, Physical Review Letters, vol 75, no. 26, pp. 4780-4783, 1995. [Online]. Available: http://prola.aps.org/abstract/PRL/v75/i26/p4780_1 VR in Medicine Homework

Thanks for your attention!