Radiosity - I N T R O D U C T I O N T O C O M P U T E R G R...

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Unformatted text preview: I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam November 9, 2006 Radiosity 1/43 Introduction to Radiosity John F. Hughes, Andries van Dam Applets by Nick Diakopoulos I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam November 9, 2006 Radiosity 2/43 Color Bleeding Soft Shadows No Ambient Term View Independent Used in other areas of Engineering Radiosity for Inter-Object Diffuse Reflection I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam November 9, 2006 Radiosity 3/43 Pretty Pictures Reality (actual photograph) Minus Radiosity Rendering Equals the difference (or error) image http://www.graphics.cornell.edu/online/box/compare.html Mostly due to mis-calibration I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam November 9, 2006 Radiosity 4/43 1. Model scene as patches 2. Each patch has an initial luminance value: all but luminaires (light sources) are probably zero 3. Iteratively determine how much luminance travels from each patch to each other patch until entire system converges to stable values We can then render scene from any angle without recomputing these final patch luminances they are viewer independent! The Radiosity Technique: An Overview I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S Andries van Dam November 9, 2006 Radiosity 5/43 Overview of Radiosity The radiometric term radiosity means rate at which energy leaves a surface Sum of rates at which surface emits energy and reflects (or transmits) energy received from all other surfaces. Radiosity simulations are based on thermal engineering model of emission and reflection of radiation using finite element approximations (FEM closely related to meshing). First determine all light interactions in a view-independent way, then render one or more views. Consider room with only floor and ceiling: Suppose ceiling is actually a fluorescent drop-panel ceiling which emits light Floor gets some of this light and reflects it back Ceiling gets some of this reflected light and sends it back Simulation mimics these successive bounces through progressive refinement each iteration contributes less energy so process converges floor ceiling I N T R O D U C T I O N T O C O M P U T E R G R A P H I C...
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Radiosity - I N T R O D U C T I O N T O C O M P U T E R G R...

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