/// <summary>
/// Compute the intersection between a mesh face perimeter and a ray tangent to the face.
/// </summary>
/// <param name="ray">The tangent ray.</param>
/// <param name="face">The mesh face.</param>
/// <param name="result">The resulting intersection point.</param>
/// <param name="halfEdge">The half-edge on where the intersection lies.</param>
/// <returns>Intersection result.</returns>
public static ISRayFacePerimeter RayFacePerimeter(Ray ray, MeshFace face, out Point3d result, out MeshHalfEdge halfEdge)
{
Vector3d faceNormal = MeshGeometry.FaceNormal(face);
Vector3d biNormal = Vector3d.CrossProduct(ray.Direction, faceNormal);
Plane perpPlane = new Plane(ray.Origin, ray.Direction, faceNormal, biNormal);
List <MeshVertex> vertices = face.AdjacentVertices();
Point3d temp = new Point3d();
Line line = new Line(vertices[0], vertices[1]);
if (LinePlane(line, perpPlane, out temp) != ISLinePlane.Point)
{
result = null;
halfEdge = null;
return(ISRayFacePerimeter.Point);
} // No intersection found
if (temp != ray.Origin && temp != null)
{
result = temp;
halfEdge = null;
return(ISRayFacePerimeter.Point);
} // Intersection found
line = new Line(vertices[1], vertices[2]);
if (LinePlane(line, perpPlane, out temp) != ISLinePlane.Point)
{
result = null;
halfEdge = null;
return(ISRayFacePerimeter.NoIntersection);
} // No intersection found
if (temp != ray.Origin && temp != null)
{
result = temp;
halfEdge = null;
return(ISRayFacePerimeter.Point);
} // Intersection found
line = new Line(vertices[2], vertices[0]);
if (LinePlane(line, perpPlane, out temp) != ISLinePlane.Point)
{
result = null;
halfEdge = null;
return(ISRayFacePerimeter.NoIntersection);
}
if (temp != ray.Origin && temp != null)
{
result = temp;
halfEdge = null;
return(ISRayFacePerimeter.Point);
}
else
{
result = null;
halfEdge = null;
return(ISRayFacePerimeter.Error);
}
}
/// <summary>
/// Compute the intersection between a mesh face perimeter and a ray tangent to the face.
/// </summary>
/// <param name="ray">The tangent ray.</param>
/// <param name="face">The mesh face.</param>
/// <param name="result">The resulting intersection point.</param>
/// <param name="halfEdge">The half-edge on where the intersection lies.</param>
/// <returns>Intersection result.</returns>
public static RayFacePerimeterIntersectionStatus RayFacePerimeter(
Ray ray,
MeshFace face,
out Point3d result,
out MeshHalfEdge halfEdge)
{
var faceNormal = MeshGeometry.FaceNormal(face);
var biNormal = Vector3d.CrossProduct(ray.Direction, faceNormal);
var perpPlane = new Plane(ray.Origin, ray.Direction, faceNormal, biNormal);
var vertices = face.AdjacentVertices();
var temp = new Point3d();
var line = new Line(vertices[0], vertices[1]);
if (LinePlane(line, perpPlane, out temp) != LinePlaneIntersectionStatus.Point)
{
result = null;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.Point);
} // No intersection found
if (temp != ray.Origin && temp != null)
{
result = temp;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.Point);
} // Intersection found
line = new Line(vertices[1], vertices[2]);
if (LinePlane(line, perpPlane, out temp) != LinePlaneIntersectionStatus.Point)
{
result = null;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.NoIntersection);
}
if (temp != ray.Origin && temp != null)
{
result = temp;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.Point);
}
line = new Line(vertices[2], vertices[0]);
if (LinePlane(line, perpPlane, out temp) != LinePlaneIntersectionStatus.Point)
{
result = null;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.NoIntersection);
}
if (temp != ray.Origin && temp != null)
{
result = temp;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.Point);
}
result = null;
halfEdge = null;
return(RayFacePerimeterIntersectionStatus.Error);
}