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We have to be careful when filtering down a large image to generate
the low resolution RGB color samples, however. For example, here we start off
with a high resolution, 1024x1024 image
of planet Earth. If we convert it into a silhouette map texture 64x64, we
have to be careful when we average down the RGB samples not to average
across the discontinuities or we could
cause problems.
On the right we show what it looks like when the texture is properly filtered when downsampling from the original. [ Note: When the image for this slide was generated, the antialiasing removed some of the silhouette map cell borders so it appears that it is a 32x32 silmap instead of a 64x64 silhouette map. ] |