/// <summary>
/// 获取（圆锥，R面，球面）最大最小斜率
/// </summary>
/// <param name="vec"></param>
private void AskFace(Vector3d vec)
{
Vector3d[] vecs = FaceUtils.AskFaceNormals(this.face);
foreach (Vector3d temp in vecs)
{
double angle = Math.Round(UMathUtils.Angle(vec, temp), 3);
if (this.MaxSlope <= angle)
{
this.MaxSlope = angle;
}
if (this.MinSlope >= angle)
{
this.MinSlope = angle;
}
}
}