/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and a <see cref="Sphere"/>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="sphere">A <see cref="Sphere"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, Sphere sphere)
{
// TODO: Implement this.
throw new NotImplementedException();
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and a <see cref="Triangle"/>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="triangle">A <see cref="Triangle"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
/// <remarks>
/// For information about the algorithm visit http://www.acm.org/jgt/papers/MollerTrumbore97/
/// </remarks>
public static IntersectionPair Intersects(Ray ray, Triangle triangle)
{
// Find the vectors for the 2 edges sharing trangle.Point0
Vector3F edge1 = triangle.Point1 - triangle.Point0;
Vector3F edge2 = triangle.Point2 - triangle.Point0;
// Begin calculating determinant - also used to calc the U parameter.
Vector3F pvec = Vector3F.CrossProduct(ray.Direction, edge2);
float det = Vector3F.Dot(edge1, pvec);
// If determinant is zero the ray lies in plane of the triangle
if (MathFunctions.ApproxEquals(det, 0.0f))
{
return new IntersectionPair(false, Vector3F.Zero);
}
float invDet = 1.0f / det;
// Calculate the distance from triangle.Point0 to the ray origin
Vector3F tvec = ray.Origin - triangle.Point0;
// Calculate U parameter and test bounds
float u = Vector3F.Dot(tvec, pvec) * invDet;
if ((u < 0.0f) || u > 1.0f)
return new IntersectionPair(false, Vector3F.Zero);
// Prepare to test the V parameter
Vector3F qvec = Vector3F.CrossProduct(tvec, edge1);
// Calculate V parameter and test bounds
float v = Vector3F.Dot(ray.Direction, qvec) * invDet;
if ((v < 0.0f) || v > 1.0f)
return new IntersectionPair(false, Vector3F.Zero);
// The ray intersects the triangle
// Calculate the distance from the ray origin to the intersection point.
//t = Vector3F.Dot(edge2, qvec) * invDet;
return new IntersectionPair(true, triangle.FromBarycentric(u,v));
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and an <see cref="AxisAlignedBox">axis aligned box</see>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="aabb">A <see cref="AxisAlignedBox"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, AxisAlignedBox aabb)
{
// TODO: Implement this.
throw new NotImplementedException();
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and an <see cref="OrientedBox">oriented box</see>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="obb">A <see cref="OrientedBox"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, OrientedBox obb)
{
// TODO: Implement this.
throw new NotImplementedException();
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and a <see cref="Plane"/>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="plane">A <see cref="Plane"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, Plane plane)
{
bool intersect = false;
Vector3F hitPoint = Vector3F.Zero;
float denominator = Vector3F.Dot(plane.Normal, ray.Direction);
// Check if the ray is parrallel to the plane
if (MathFunctions.ApproxEquals(denominator, 0.0f))
{
// If the line is parallel to the plane it only intersects the plane if it is on the plane.
intersect = (plane.GetSign(ray.Origin) == MathFunctions.Sign.Zero);
if (intersect)
hitPoint = ray.Origin;
}
else
{
float t = (plane.Constant - Vector3F.Dot(plane.Normal, ray.Origin)) / denominator;
hitPoint = ray.Origin + ray.Direction * t;
intersect = true;
}
return new IntersectionPair(intersect, hitPoint);
}
/// <summary>
/// Initializes a new instance of the <see cref="Ray"/> class using given ray.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance to assign values from.</param>
public Ray(Ray ray)
{
_origin = ray.Origin;
_direction = ray.Direction;
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and a <see cref="Sphere"/>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="sphere">A <see cref="Sphere"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, Sphere sphere)
{
// TODO: Implement this.
throw new NotImplementedException();
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and an <see cref="OrientedBox">oriented box</see>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="obb">A <see cref="OrientedBox"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, OrientedBox obb)
{
// TODO: Implement this.
throw new NotImplementedException();
}
/// <summary>
/// Tests for intersection between a <see cref="Ray"/> and an <see cref="AxisAlignedBox">axis aligned box</see>.
/// </summary>
/// <param name="ray">A <see cref="Ray"/> instance.</param>
/// <param name="aabb">A <see cref="AxisAlignedBox"/> instance.</param>
/// <returns>An <see cref="IntersectionPair"/> instance containing the intersection information.</returns>
public static IntersectionPair Intersects(Ray ray, AxisAlignedBox aabb)
{
// TODO: Implement this.
throw new NotImplementedException();
}
