Video Filter

The video filter performs the second pass of the analogizing algorithm. The first pass is done in the blender and involves antialiasing of internal or non-silhouette edges. After the image is rendered into the framebuffer, all pixels except those that are on the silhouettes of objects will be fully covered (coverage = 1.0). For partially covered pixels, the video filter performs a linear interpolation between the foreground color and the background color:

Equation 11 Video Filter Interpolation

The ForeGround color is always the color stored in the frame buffer for that pixel. The BackGround color is found by examining fully covered pixels in a 5x3 pixel area around the current pixel. Note that Z is not used in determining the BackGround color and so it is safe for Z to be single-buffered.

Copyright © 1999 Nintendo of America Inc. All Rights Reserved Nintendo and N64 are registered trademarks of Nintendo Last Updated January, 1999