/// <summary>
/// Get the intersection between a line and a plane.
// If the line and plane are not parallel, the function outputs true, otherwise false.
/// </summary>
/// <param name="intersection"></param>
/// <param name="ray"></param>
/// <param name="plane"></param>
/// <returns></returns>
public static bool LinePlaneIntersection(out Vector3 intersection, Ray ray, ExtPlane plane)
{
float length;
float dotNumerator;
float dotDenominator;
Vector3 vector;
intersection = Vector3.zero;
//calculate the distance between the linePoint and the line-plane intersection point
dotNumerator = Vector3.Dot((plane.Point - ray.origin), plane.Normal);
dotDenominator = Vector3.Dot(ray.direction, plane.Normal);
//line and plane are not parallel
if (dotDenominator != 0.0f)
{
length = dotNumerator / dotDenominator;
//create a vector from the linePoint to the intersection point
vector = ExtVector3.SetVectorLength(ray.direction, length);
//get the coordinates of the line-plane intersection point
intersection = ray.origin + vector;
return(true);
}
//output not valid
else
{
return(false);
}
}
//This function returns a point which is a projection from a point to a plane.
public static Vector3 ProjectPointInPlaneMethod2(Vector3 planeNormal, Vector3 planePoint, Vector3 point)
{
float distance;
Vector3 translationVector;
//First calculate the distance from the point to the plane:
distance = SignedDistancePlanePoint(planeNormal, planePoint, point);
//Reverse the sign of the distance
distance *= -1;
//Get a translation vector
translationVector = ExtVector3.SetVectorLength(planeNormal, distance);
//Translate the point to form a projection
return(point + translationVector);
}
