1. Visualization Using Hardware Accelerated Spline Interpolation Petr Kadlec, Marek Gayer, Pavel Slavík C omputer G raphics G roup Department of Computer Science and Engineering Faculty of Electrical Engineering Czech Technical University in Prague, Czech Republic WSCG’2004, February 2–6, 2004, Plzeň, Czech Republic www.cgg.cvut.cz

2. Visualization Using Hardware Accelerated Spline Interpolation2 Visualization of Gridded Data Interpolation Conversion of data to visual parameters Rendering MyPCC coal combustion application [1] [1] Gayer M., Slavík P., Hrdlička F. Interactive Educational System for Coal Combustion Modeling in Power Plant Boilers. In: Eurocon 2003 – Computer as a Tool – Proceedings. Ljubljana: IEEE Slovenia Section, 2003

3. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation3 Interpolation – Linear +Traditional, supported +Simplicity +Speed –Quality! Nonlinear data Triangular pattern Big gradient problems

4. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation4 Interpolation – Bicubic Splines +Quality! –More work –Speed? Use modern hardware!

5. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation5 Implementation Vertex&fragment programs (a.k.a. shaders) –OpenGL ARB extensions –Works on common current hardware (e.g. GF2MX 400, GFFX, ATI Radeon 8500 and above) Interpolation core running on GPU Per-pixel / per-vertex interpolation

6. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation6 Compare the Quality

7. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation7 Value to Color Conversion Precalculated texture Texture = Color LUT

8. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation8 Isolines For Free Slight modification of the texture +Simple, fast (free!) –Blurry

9. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation9 Measurements SystemLinearSpline Per-Vertex Spline Per-Pixel GF2MX5727<1 * GF4TI955620 GF-FX14811068 (Please, see the paper for more details.)

10. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation10 Conclusion We have designed an implemented hardware accelerated grid visualization Spline interpolation method Runs real-time on current graphics hardware, comparable speed with linear interpolation approach

11. www.cgg.cvut.cz Visualization Using Hardware Accelerated Spline Interpolation11 Thank you for your attention. Petr Kadlec