/// <summary>
/// 空间中一个点在一个面上的投影点
/// </summary>
/// <param name="face"></param>
/// <param name="point"></param>
/// <returns></returns>
public static Vector3 ProjectPointOnPlane(Face face, Vector3 point)
{
float num = Math3d.SignedDistancePlanePoint(face, point);
num *= -1f;
Vector3 b = Math3d.SetVectorLength(face.normal, num);
return(point + b);
}
/// <summary>
/// 线面是否相交
/// </summary>
/// <param name="intersection">交点</param>
/// <param name="linePoint"></param>
/// <param name="lineVec"></param>
/// <param name="face"></param>
/// <returns>是否相交</returns>
public static bool LinePlaneIntersection(Vector3 linePoint, Vector3 lineVec, Face face, out Vector3 intersection)
{
intersection = Vector3.zero;
float num = Vector3.Dot(face.point - linePoint, face.normal);
float num2 = Vector3.Dot(lineVec, face.normal);
if (num2 != 0f)
{
float size = num / num2;
Vector3 b = Math3d.SetVectorLength(lineVec, size);
intersection = linePoint + b;
return(true);
}
return(false);
}