I was playing around with some implicit surface stuff the otherQuote:>s As the title says, I'm looking for a shareware or freeware

>graphic editor supporting all gif and bmp formats. Thanx.

>-Syther

day and was surprised to find that the Gaussian curvature of "blobs"

appears to be discontinous. Even simple examples such as a smooth peanut

defined from two gaussian potentials appear to have discontinuities,

(at least according to my code :) and this puzzles me a little as these

shapes look so smooth. On the other hand, it looks like the absolute

value of the Gaussian curvature is continous,

except from degenerate points where the gradient is zero (such as

the center point of a degenerate peanut/butterfly). I tested my

code on simple surfaces where the curvature can be computed from

a parameterization (ellipsoids and cylinders) and got the correct

result to 5 accurate digits (computed the principal curvatures

analytically by normalizing and differentiating the gradient and then

solving for eigenvalues).

Havn't had time to give much thought to this, but I think it

is kinda fun and would appreciate any comments.

Yours ignorantly - Hans