03/13/2003
15-462 Graphics I
12
Scan Conversion of Polygons
•Multiple
tasks for scan conversion
–Filling polygon (inside/outside)
–Pixel shading (color interpolation)
–Blending (accumulation, not just writing)
–Depth values (z-buffer hidden-surface removal)
–Texture coordinate interpolation (texture
mapping)
•Hardware
efficiency critical
•Many
algorithms for filling (inside/outside)
•Much
fewer that handle all tasks well