I didn't understand the C1 and C2 terminology used here. Looking online I found that it is a metric for the smoothness of the surface. It is a measure of the number of directions in which the derivative is continuous, so for C2 there are 2 directions with continuous derivatives.
https://en.wikipedia.org/wiki/Smoothness
szzheng
Just to add on to that, C1 means the first derivate is continuous and C2 means both the first and second derivates are continuous.
I didn't understand the C1 and C2 terminology used here. Looking online I found that it is a metric for the smoothness of the surface. It is a measure of the number of directions in which the derivative is continuous, so for C2 there are 2 directions with continuous derivatives. https://en.wikipedia.org/wiki/Smoothness
Just to add on to that, C1 means the first derivate is continuous and C2 means both the first and second derivates are continuous.