Lecture05-Z-Buffering

# Lecture05-Z-Buffering - CS 455 – Computer Graphics...

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Unformatted text preview: CS 455 – Computer Graphics Z-buffering, or, Interpolating other things across a triangle. Math Problem of the Da (5,2,3) (1,4,6) (3,7,0) (2, 5) Math Problem of the Da (5,2,3) (1,4,6) (3,7,0) (2, 5) Math Problem of the Day • What is the depth at (2,5)? What’s the value of the relative contribution (shown in blue) for each vertex at (2,5)? (5,2,3) (1,0,0) (1,4,6) (0,1,0) (3,7,0) (0,0,1) (2, 5) (?, ?, ?) Math Problem of the Day • What is the depth at (2,5)? What’s the value of the relative contribution (shown in blue) for each vertex at (2,5)? (5,2,3) (1,0,0) (1,4,6) (0,1,0) (3,7,0) (0,0,1) (2, 5) (?, ?, ?) Math Problem of the Day • What is the depth at (2,5)? What’s the value of the relative contribution (shown in blue) for each vertex at (2,5)? (5,2,3) (1,0,0) (1,4,6) (0,1,0) (3,7,0) (0,0,1) (2, 5) (?, ?, ?) Math Problem of the Day • What is the depth at (2,5)? (5,2,3) (1,4,6) (3,7,0) (2, 5) r l 8 . 3 5 6 5 3 2 7 5 3 5 3 1 5 6 6 7 . 1 1 4 7 1 3 1 1 1 1 =- = ⋅-- + = ⋅ + = = ⋅-- + = ⋅ + = s lo p e r s lo p e l x x 5 1 1 5 9 3 3 5 3 3 3 y) in (change z) in (change 3 4 1 3 6 6 1 ) 4 7 ( ) 6 ( 6 1 y) in (change z) in (change 6 =- =- + = ⋅ + = = ⋅- + = ⋅-- + = ⋅ + = z z r l Z-Buffering • Image creation algorithm: Determine which object is visible at each pixel Order of polygons not critical Works for dynamic scenes • Basic idea: Rasterize (scan-convert) each polygon, one at a time Keep track of a z value at each pixel- Interpolate...
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Lecture05-Z-Buffering - CS 455 – Computer Graphics...

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