C + + algorithm on discrete points differential, experts to answer! Surface pixels to create a picture has recently read the procedures, which used one discrete points differential algorithm. Now I just According to the definition of differential (f (x) --f (x2)) / (x1--x2) calculation of the direction of the micro-surface two scores (in the process of reading the pixel values for f). But the effects are not smooth surface, the stands. Therefore, I think a better differential algorithm to improve surface smoothness beautiful painting out some more. Will proposal for a master ah, a lot of versions of the help! The problem is that the point differential discrete problem! I like to talk about the increase msn [email]wangyan_4@hotmail.com[/email] Thank you, Thank you! Numerical analysis of the interpolation method may be Xianxie upstairs, can specifically explain? Who heard of a high order center difference, and give explanations? [ Closed window ]