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revision 1.26 by jvk, Fri Oct 31 16:55:53 2003 UTC revision 1.27 by jvk, Fri Oct 31 17:54:54 2003 UTC
# Line 248  However, this is not the case here: the Line 248  However, this is not the case here: the
248  are different, and it happens to be that \emph{in screen space}, anisotropic filtering  are different, and it happens to be that \emph{in screen space}, anisotropic filtering
249  of an anisotropic texture is always better than the isotropic filtering of  of an anisotropic texture is always better than the isotropic filtering of
250  an isotropic texture. This is shown in detail in Fig.~\ref{figstretchsquishwhyworks}.  an isotropic texture. This is shown in detail in Fig.~\ref{figstretchsquishwhyworks}.
251  The trilinear filter footpring size depends strongly on subpixel position and  The trilinear filter footprint size depends strongly on subpixel position and
252  can be quite large compared to the actual pixel, causing blurring.  can be quite large compared to the actual pixel, causing blurring.
253  When using the anisotropic filter, the footprint remains significantly smaller  When using the anisotropic filter, the footprint remains significantly smaller
254  in one direction regardless of subpixel shifting --- in the other direction,  in one direction regardless of subpixel shifting --- in the other direction,
255  it is similar.  it is similar.
256    
257  - analogous to supersampling  - too large footprint --> blurry
258    
259    - too small footprint --> aliasing
260    
261    - aliasing worse than blurring
262      --> footprint made too large rather than too small (mipmap levels)
263    
264    - when texels are narrower in one direction, the granularity of the
265      pixel footprint will be smaller in that direction
266    
267    - thus, the footprint can better match the pixel in that direction
268    
269    - however, a larger number of narrow texels is needed to fill the
270      area of the pixel
271    
272    - analogous to supersampling
273    
274  - downsides:  - downsides:
275    
# Line 278  Magnified examples of text filtered usin Line 292  Magnified examples of text filtered usin
292  % Hard to assess quality if zoomed too much (if the pixels are clearly  % Hard to assess quality if zoomed too much (if the pixels are clearly
293  % visible, the grid structure will obscure the actual image).  % visible, the grid structure will obscure the actual image).
294  % Is this fig referred to?  % Is this fig referred to?
   
295  }  }
296  \end{figure*}  \end{figure*}
297    

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