public void TestCloseMiss()
{
Assert.IsFalse(
Line3Sphere3Collider.FindContacts(
new Vector3(0.0f, 10.1f, 0.0f), Vector3.Right,
Vector3.Zero, 10.0f
).HasContact
);
}
public void TestCenterCrossing()
{
Vector3 diagonalUnit = Vector3.Normalize(Vector3.One);
LineContacts contacts = Line3Sphere3Collider.FindContacts(
diagonalUnit * -15.0f, diagonalUnit,
Vector3.Zero, 10.0f
);
Assert.That(
contacts.EntryTime,
Is.EqualTo(5.0f).Within(Specifications.MaximumDeviation).Ulps
);
Assert.That(
contacts.ExitTime,
Is.EqualTo(25.0f).Within(Specifications.MaximumDeviation).Ulps
);
}
/// <summary>Determines where a ray will hit a sphere, if at all</summary>
/// <param name="rayStart">Starting point of the ray</param>
/// <param name="rayDirection">Direction into which the ray extends</param>
/// <param name="sphereCenter">Center of the sphere</param>
/// <param name="sphereRadius">Radius of the sphere</param>
/// <returns>The intersection points between the ray and the box, if any</returns>
public static LineContacts FindContacts(
Vector3 rayStart, Vector3 rayDirection, Vector3 sphereCenter, float sphereRadius
)
{
LineContacts contacts = Line3Sphere3Collider.FindContacts(
rayStart, rayDirection, sphereCenter, sphereRadius
);
// If the line has entered the box before the reference point, this means
// that the ray starts within the box, thus, its first contact occurs immediately
if (!float.IsNaN(contacts.EntryTime))
{
if (contacts.ExitTime < 0.0f) // Entry & exit before the ray's beginning?
{
return(LineContacts.None);
}
else if (contacts.EntryTime < 0.0f) // Only entry before ray's beginning?
{
contacts.EntryTime = 0.0f;
}
}
return(contacts);
}