1 / 20

230 likes | 459 Views

Flame Animation. Team : Fire! 20061237 Lee, Ho-Jin 20071229 Kim, Young Soo. Objective. Modeling the flame physically and realistically Rendering of the result of simulated flame. Physical Modeling Function. INPUT : Temperature, Pressure, Density, Velocity, Material in specific time

Download Presentation
## Flame Animation

**An Image/Link below is provided (as is) to download presentation**
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.
Content is provided to you AS IS for your information and personal use only.
Download presentation by click this link.
While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

**Flame Animation**Team : Fire! 20061237 Lee, Ho-Jin 20071229 Kim, Young Soo**Objective**• Modeling the flame physically and realistically • Rendering of the result of simulated flame**Physical Modeling Function**• INPUT : Temperature, Pressure, Density, Velocity, Material in specific time • OUTPUT : RGB Color Value • Physically simulate the flame and make data for rendering**Fluid Simulation**• Get variables of each cell in next time step from data of given time Picture from [Stam99]**Navier-Stokes Equation**• Equation to describe the state of viscous fluid • Navier-Stokes Eq. for incompressible fluids was used for simulation Velocity**Fluid Modeling**• Amount of moved fluid depends on density and velocity**Fluid Modeling**• Derivative of density is proportional to the amount of transferred gas • From equation of ideal gas state**Fluid Modeling**• Because internal energy of gas istime derivative of Temperature is**Material Modeling**• Like the thermal flow, oxygen and fuel flow is**Material Modeling**• According to Chemical Kinetics and Arrhenius’s Equation, the amount of burned fuel is • Then energy conservation law gives**Get RGB Value from Variables**• Emitted energy proportional to the amount of burned fuel • RGB Values depends on temperature • In the basic case, it changes form red in low temperature to yellow in high temperature**Volume Rendering**• 각각의 Cell을 Volume Rendering을 사용 • Volume감 있는 Fire Animation을 표현**Volume Rendering**• 반투명한 GLUT의 Cube를 이용해 그리드의 각 Cell들의 색상 랜더링 • Alpha Blending 시에는 Z-Buffering에만 의존할 수 없으므로 시점에 따라 뒤에서부터 그려주게 코드 작성**Example [RGB Cube]**• Different Alpha Channel Value (A= 120, 60, 30, 5) • Different Cell Grid Size (N = 10, 20, 50)**Demo**GRIDSIZE = 10 GRIDSIZE = 10 GRIDSIZE = 10**Conclusion**• Successfully modeled flame physically • But couldn’t find realistic and stable solution • Navier-Stokes Equation Solver should be more stable • Rendered explosion**Future works**• Develop more stable CFD Solver • Implement Solver for GPGPU • Volume Rendering using Ray Casting with GPU**Reference**• Wikipedia : Navier-Stokes Equations (http://en.wikipedia.org/wiki/Navier_Stokes, 2009.06.22 현재) • JosStam, "Stable Fluids", SIGGRAPH 1999, 121-128, 1999 • JosStam, "Real-Time Fluid Dynamics for Games", Game Developer Conference 2003 • Wikipedia : Arrhenius Equation (http://en.wikipedia.org/wiki/Arrhenius_equation, 2006.06.22 현재) • Keenan Crane et al, Real-Time Simulation and Rendering of 3D Fluids, GPU Gems 3, 633-675, Addison-Wesley Professional, 2007

More Related