/// <summary>
///求异面直线公垂线在该直线上的垂足
/// </summary>
public Point GetFootPointWithSkewLine(RayInfo otherRay)
{
SpectVector verticalVector = this.RayVector.CrossMultiplied(otherRay.RayVector);//求两条异面直线的公垂线的向量
Face viewFace = new SpaceFace(this.Origin, this.RayVector.CrossMultiplied(verticalVector));
Point crossPoint = otherRay.GetCrossPointBetweenStraightLineAndFace(viewFace);
return(this.getDropFoot(crossPoint));
}
/// <summary>
///求平面外一条直线在该平面上的投影
/// </summary>
/// <param name="viewPoint">平面外一条直线</param>
/// <returns>平面外一条直线在该平面上的投影</returns>
public RayInfo GetProjectionRayInFace(RayInfo viewRay)
{
double dotProduct = this.normalVector.a * viewRay.RayVector.a +
this.normalVector.b * viewRay.RayVector.b + this.normalVector.c * viewRay.RayVector.c;
if (Math.Abs(dotProduct) < 0.00000001)
{
return(new RayInfo(this.GetProjectionPointInFace(viewRay.Origin), viewRay.RayVector));
}
else
{
Point rayPointInFace = this.GetProjectionPointInFace(viewRay.Origin);
Point crossPoint = viewRay.GetCrossPointBetweenStraightLineAndFace(this);
return(new RayInfo(rayPointInFace, crossPoint));
}
}