Christopher James Huff wrote:

> In article <403e78b2@news.povray.org>, Wolfgang Wieser <wwi### [at] gmxde>
> wrote:
> 
>> The idea is that in case we cross the isosurface threshold and
>> one point is outside (EP1) while the other one is inside (EP2),
>> then the average of the two depth values should give a better
>> estimate for the actual intersection than merely using EP2.
> 
> Linear interpolation is a pretty common last step in the bisection
> algorithm...I did it for the blob2 object, I wasn't aware the isosurface
> object didn't do it.
> 
To see the actual accuracy improvement achieved by my patch, I 
finally made some comparative renderings with different accuracy 
settings using a "Water on Mars" test scene. 

Details here: 
http://www.cip.physik.uni-muenchen.de/~wwieser/tmp/poviso.html#accuracy

Wolfgang

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