/// <summary>
/// Determines if and when the ray intersects the bounding box.
/// </summary>
/// <param name="boundingBox">Bounding box to test against.</param>
/// <param name="t">The length along the ray to the impact, if any impact occurs.</param>
/// <returns>True if the ray intersects the target, false otherwise.</returns>
public bool Intersects(ref BoundingBox boundingBox, out float t)
{
if (Math.Abs(Direction.X) < Toolbox.Epsilon && (Position.X < boundingBox.Min.X || Position.X > boundingBox.Max.X))
{
//If the ray isn't pointing along the axis at all, and is outside of the box's interval, then it
//can't be intersecting.
t = 0;
return(false);
}
float tmin = 0, tmax = float.MaxValue;
float inverseDirection = 1 / Direction.X;
float t1 = (boundingBox.Min.X - Position.X) * inverseDirection;
float t2 = (boundingBox.Max.X - Position.X) * inverseDirection;
if (t1 > t2)
{
float temp = t1;
t1 = t2;
t2 = temp;
}
tmin = Math.Max(tmin, t1);
tmax = Math.Min(tmax, t2);
if (tmin > tmax)
{
t = 0;
return(false);
}
if (Math.Abs(Direction.Y) < Toolbox.Epsilon && (Position.Y < boundingBox.Min.Y || Position.Y > boundingBox.Max.Y))
{
//If the ray isn't pointing along the axis at all, and is outside of the box's interval, then it
//can't be intersecting.
t = 0;
return(false);
}
inverseDirection = 1 / Direction.Y;
t1 = (boundingBox.Min.Y - Position.Y) * inverseDirection;
t2 = (boundingBox.Max.Y - Position.Y) * inverseDirection;
if (t1 > t2)
{
float temp = t1;
t1 = t2;
t2 = temp;
}
tmin = Math.Max(tmin, t1);
tmax = Math.Min(tmax, t2);
if (tmin > tmax)
{
t = 0;
return(false);
}
if (Math.Abs(Direction.Z) < Toolbox.Epsilon && (Position.Z < boundingBox.Min.Z || Position.Z > boundingBox.Max.Z))
{
//If the ray isn't pointing along the axis at all, and is outside of the box's interval, then it
//can't be intersecting.
t = 0;
return(false);
}
inverseDirection = 1 / Direction.Z;
t1 = (boundingBox.Min.Z - Position.Z) * inverseDirection;
t2 = (boundingBox.Max.Z - Position.Z) * inverseDirection;
if (t1 > t2)
{
float temp = t1;
t1 = t2;
t2 = temp;
}
tmin = Math.Max(tmin, t1);
tmax = Math.Min(tmax, t2);
if (tmin > tmax)
{
t = 0;
return(false);
}
t = tmin;
return(true);
}
/// <summary>
/// Determines if and when the ray intersects the bounding box.
/// </summary>
/// <param name="boundingBox">Bounding box to test against.</param>
/// <param name="t">The length along the ray to the impact, if any impact occurs.</param>
/// <returns>True if the ray intersects the target, false otherwise.</returns>
public bool Intersects(BoundingBox boundingBox, out float t)
{
return(Intersects(ref boundingBox, out t));
}
