shadow-cgt511 - Shadow by Israa Bukhari Innfarn Yoo Page 1...

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Page 1 Shadow by Israa Bukhari Innfarn Yoo
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Page 2 Objectives •T o illustrate several shadow methods with two different points of view: –P h o t o Realistic –R e a l Time •P r o b l e m s of shadow, and how each method solve the problems. •p r o s and cons of each method Objectives Shadow methods Summary References
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Page 3 •P h o t o Realistic Approaches Ray Tracing Radiosity •R e a l Time Approaches Classic Shadow Rendering l a n a r Shadow • Shadow Volume • Shadow Map Lighting Calculations via Texturing •B um p Mapping • Parallax Mapping • Relief Mapping Approximation of Global Illumination in Real Time •Am b i e n t Occlusion • Spherical Harmonic Lighting Objectives Shadow methods Summary References Objectives
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Page 4 Shadows • Definition –A n area where Light or Photons are occluded •L i g h t & Shadow –O n l y light exist. – Shadow in computer graphics is perceived as an area where small amounts of photons exist, compared to other areas. – Shadow is actually a lighting effect! Objectives Shadow methods Summary References
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Page 5 Photo Realistic Approaches • Called “Global Illumination” • Actually, Lighting Calculation •T r y to simulate light or photons behavior –s o l v e s “the rendering equation” • Accurate! But Extremely Slow! • Methods –R a y Tracing a d i o s i t y Objectives Shadow methods Summary References
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Page 6 Ray Tracing Objectives Shadow methods Summary References http://sunflow.sourceforge.net/gallery/v0060/livingroom.png http://www.lightandmatter.com/html_books/lm/ch28/ch28.html
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Page 7 Ray Tracing Objectives Shadow methods Summary References • Advantages –M o s t Accurate • Because simulate real light behavior – Express almost all lighting effect • Disadvantages o s t Expensive •E x t r em e l y Slow to render A SCENE • Typically requires several hours of rendering – Cannot express some light effects (Wave based) • Polization • Diffraction
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Page 8 Radiosity Objectives Shadow methods Summary References http://richardpage.wordpress.com/2008/01/22/radiosity-and-raytracing/
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Page 9 Radiosity Objectives Shadow methods Summary References • Advantages –F a s t e r than Ray Tracing –C a n express soft shadow • Disadvantages –O n l y deal with “diffuse” surfaces – Cannot calculate proper reflection and refraction
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Page 10 Real Time Approaches •R e a l Time Application renders 30 ~ 60 images per seconds –R e a l Time Shadow means rendering many objects’ shadow per every frame on the fly. • Compromise Strategy between performance (Rendering Speed) and realistic rendering. • Methods can be divided by 3 categories – Classic Shadow Rendering – Lighting Calculation via Texturing – Approximation of Global Illumination in Real Time Objectives Shadow methods Summary References
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Page 11 Planar Shadow • Assumption – Ground is ALWAYS a PLANE • Calculate Projected Area of Objects –F r om light source to ground –P e r every triangle(or primitive) Objectives Shadow methods Summary References
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Page 12 Planar Shadow Objectives Shadow methods Summary References Real-Time Rendering 3 rd Edition
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This note was uploaded on 02/19/2012 for the course CGT 101 taught by Professor Mohler,j during the Fall '08 term at Purdue University-West Lafayette.

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shadow-cgt511 - Shadow by Israa Bukhari Innfarn Yoo Page 1...

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