Provides information about the continuity of a curve:
- C0: only geometric continuity.
- G1: for each point on the curve, the tangent vectors "on the right" and "on the left" are collinear with the same orientation.
- C1: continuity of the first derivative. The "C1" curve is also "G1" but, in addition, the tangent vectors " on the
right" and "on the left" are equal.
- G2: for each point on the curve, the normalized normal vectors "on the right" and "on the left" are equal.
- C2: continuity of the second derivative.
- C3: continuity of the third derivative.
- CN: continuity of the N-th derivative, whatever is the value given for N (infinite order of continuity). Also provides information about the continuity of a surface:
- C0: only geometric continuity.
- C1: continuity of the first derivatives; any isoparametric (in U or V) of a surface "C1" is also "C1".
- G2: for BSpline curves only; "on the right" and "on the
left" of a knot the computation of the "main curvature
radii" and the "main directions" (when they exist) gives the same result.
- C2: continuity of the second derivative.
- C3: continuity of the third derivative.
- CN: continuity of any N-th derivative, whatever is the value given for N (infinite order of continuity). We may also say that a surface is "Ci" in u, and "Cj" in v to indicate the continuity of its derivatives up to the order i in the u parametric direction, and j in the v parametric direction.
| Enumerator |
|---|
| GeomAbs_C0 |
|
| GeomAbs_G1 |
|
| GeomAbs_C1 |
|
| GeomAbs_G2 |
|
| GeomAbs_C2 |
|
| GeomAbs_C3 |
|
| GeomAbs_CN |
|
