Lecture 25: slide

Interactive Computer Graphics: A Top-Down Approach Using OpenGL (4th Edition)

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1 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Advanced Graphics Lab Class 25 November 15, 2007 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Announcements ± Email me to schedule a time if you haven’t already done so ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 3 Design of a high-resolution plenoptic camera Friday, November 16, 2007 ECE 118 at noon Viktor Chekh Advanced Graphics Lab ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Last time ± Shadows ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Today ± More on hard and soft shadows ± General graphics effects ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Perspective shadow maps ± Developed by Stamminger and Drettakis (SIGGRAPH 2002) ± Observation: one source of artifacts is the differences in perspective projection between the light source and viewer ± Combat these artifacts by transforming the objects by the eye’s perspective projection before computing the shadow map
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2 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Sources of artifacts From Stamminger et al. SIGGRAPH 02 ) cos( ) cos( α β i s s r r d d = Perspective aliasing Projective aliasing ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Perspective shadow maps From Stamminger et al. SIGGRAPH 02 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Perspective shadow maps results standard shadow maps perspective shadow maps ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Problems with perspective shadow maps ± Lots of special cases that are difficult to implement ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 25– November 15, 2007 Shadow volumes ± The other leading approach for real-time hard shadows ± Developed by Crow (1978) ± Based on the observation that you can determine whether a point is in shadow or not by counting how many times it has
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This note was uploaded on 01/30/2008 for the course ECE 433 taught by Professor Sen during the Fall '07 term at New Mexico.

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Lecture 25: slide - Announcements ECE/CS 433 Introduction...

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