Visibility and Hidden Surface Removal

z-buffer: exploiting depth
coherence
• From one scanline (y) to the next (y + 1):
left polygon edge point: from (x, y) to (x + 1/m, y+1),
where m is the slope of the polygon edge
• So the new z
A
z x =z
C
z y =z
A/m + B
C
© Machiraju/Zhang/Möller
Pre-computed
and stored
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