lecture10 - CSE472 Computer Graphics Ray Tracing Rendering...

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1 CSE472 Computer Graphics Ray Tracing Rendering Methods Rays Rays for screen images Shadows Recursion
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2 CSE472 Computer Graphics Z-Buffer Rendering Object Coordinates Modelview Matrix Projection Homogenize Window to Viewport Eye coordinates Clip coordinates Normalized device coordinates coordinates Objects are immediately drawn onto the screen. We use a “z-buffer” to keep track of what is in front…
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3 CSE472 Computer Graphics Visible Surface Raytracing Object Coordinates Modelview Matrix Intersection Data Structure Eye coordinates Raytracing then utilizes this data structure to build the image.
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4 CSE472 Computer Graphics Raytracing Invented by Arthur Appel in 1968 at the IBM  T.J. Watson Research Center.  Not considered a major accomplishment since it  was deemed impractical given its enormous  computational requirements.   Languished in obscurity until the late 1970’s,  when computer and display capabilities began to  just barely catch up.  SIGGRAPH’77 saw many  significant developments, including the first  looks at modeling reflection and shadows.
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5 CSE472 Computer Graphics More History A true recursive ray tracer was presented for  the first time by Turner Whitted in the classic  article “ An improved illumination model for  shaded display ” in the June, 1980  Communications of the ACM.   Note that the article is more concerned with the  model for illumination than the ray tracing  algorithm.
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6 CSE472 Computer Graphics That Pinhole Camera Model After eyespace transformation Projection Plane at z=-d
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7 CSE472 Computer Graphics What does that projection plane represent? (left, bottom, znear) (right, top, znear) Pixels
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CSE472 Computer Graphics Raytracing If we shoot a line from the center of projection through the center of a pixel and off into space… What does it hit first? If it hits an object, compute the color for that
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lecture10 - CSE472 Computer Graphics Ray Tracing Rendering...

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