Aliasing%20(Again)

1
Aliasing (Again)

• The straightforward sampling of texture maps can
  lead to really horrible-looking texture break-up.
• This is one of the classic (and most noticeable)
  of aliasing problems.
• We need to use some form of filtering to reduce
  aliasing. For example, super-sample several
  points for each pixel and combine by (weighted)
  averaging.

2
Texture Sampling Mip Maps

• Compute multiple versions of the texture map,
  each cut in half along each dimension. Pixels at
  lo-res are average of 4 pixels at next higher
  res.
• Choose a Level of Detail (LOD) based on the
  spacing of a pixel increment on the texture grid.
  1-1 (LOD0), 1-2 (LOD1), 1-4 (LOD2),
• Pick one level of detail or interpolate between
  the two closest ones, 1-3 (interpolate between
  LOD1 and LOD2),
• This is generally quite fast and supportable by
  hardware.

http//developer.intel.com/technology/3d/docs/TEXT
URE.HTM