Parametric line

Menu: Geometry->Create->Parametric line

Tool to create a parametric approximated curve

The data that must be input are the mathematical formulae of the coordinates X(t), Y(t) and Z(t), where 't' is the parameter of the curve, and its value belongs to the interval [ t0-t1 ]. The curve is created by approximation and is a NURBS (Non-Uniform Rational B-Spline) which is created with N points. In GiD these kinds of curves are cubic (order 3).

The valid mathematical functions are all Tcl functions:

+ - * / %
abs cosh log sqrt acos double log10 srand asin exp pow tan atan floor rand tanh atan2 fmod round ceil hypot sin cos int sinh

EXAMPLE

We fill the formula bars with the expression of a conic helix.
That helix starts with radius R₀=4 and finishes with radius R₁=1, performing N=3 turns from t=0.0 to t=1.0, the height also changes from 0 to H=5.