private static void EvalStepByStep()
{
string htmlLog;
E e = E.Sum(E.Div(E.NumConst(1),
E.Num("d")),
E.Mul(E.Num("a"), E.Div(E.Sum(E.Num("b"), E.NumConst(14), E.Num("c")),
E.Num("d"))));
e = e.EvaluateStepByStep(out htmlLog, "a", 2, "b", 33, "c", 24);
E x = E.Num("x");
E y = E.Num("y");
E z = E.Num("z");
Vec4 v = new Vec4(x, y, z, E.Zero);
Mat4 rotToX = Mat4.RotToX(v);
Mat4 rotXAlpha = Mat4.RotX(E.Num("alpha"));
Mat4 r = rotToX * rotXAlpha;
r.EvaluateStepByStep(out htmlLog /*, "x", 1, "y", 1, "z", 1*/);
Mat4 rotX = Mat4.RotX(E.Num("phi"));
Mat4 rotY = Mat4.RotY(E.Num("theta"));
Mat4 rotZ = Mat4.RotZ(E.Num("psi"));
r = rotX * rotY * rotZ;
r.EvaluateStepByStep(out htmlLog);
Mat4 rotToZ = Mat4.RotToZ(v);
r = rotToZ.Evaluate();
}
