public void TestCloseMiss()
{
Vector3 boxExtents = new Vector3(10.0f, 10.0f, 10.0f);
LineContacts contacts = Line3Aabb3Collider.FindContacts(
new Vector3(0.0f, 0.0f, 10.1f), Vector3.Right, boxExtents
);
Assert.IsNaN(contacts.EntryTime);
Assert.IsNaN(contacts.ExitTime);
}
public void TestContactOnCornerDefinedBox()
{
LineContacts contacts = Line3Aabb3Collider.FindContacts(
new Vector3(97.5f, -102.5f, 0.0f), Vector3.Up,
new Vector3(90.0f, -110.0f, -10.0f), new Vector3(110.0f, -90.0f, 10.0f)
);
Assert.That(
contacts.EntryTime,
Is.EqualTo(-7.5f).Within(Specifications.MaximumDeviation).Ulps
);
Assert.That(
contacts.ExitTime,
Is.EqualTo(12.5f).Within(Specifications.MaximumDeviation).Ulps
);
}
public void TestContact()
{
Vector3 boxExtents = new Vector3(10.0f, 10.0f, 10.0f);
LineContacts contacts = Line3Aabb3Collider.FindContacts(
new Vector3(-2.5f, -2.5f, -2.5f), Vector3.Up, boxExtents
);
Assert.That(
contacts.EntryTime,
Is.EqualTo(-7.5f).Within(Specifications.MaximumDeviation).Ulps
);
Assert.That(
contacts.ExitTime,
Is.EqualTo(12.5f).Within(Specifications.MaximumDeviation).Ulps
);
}
public void TestDiagonalCloseMiss()
{
Vector3 boxExtents = new Vector3(5.0f, 5.0f, 5.0f);
Vector3 diagonalVector = Vector3.Normalize(Vector3.One);
LineContacts contacts = Line3Aabb3Collider.FindContacts(
new Vector3(-10.1f, 0.0f, 0.0f), diagonalVector, boxExtents
);
Assert.IsNaN(contacts.EntryTime);
Assert.IsNaN(contacts.ExitTime);
diagonalVector.Y = -diagonalVector.Y;
contacts = Line3Aabb3Collider.FindContacts(
new Vector3(0.0f, 10.1f, 0.0f), diagonalVector, boxExtents
);
Assert.IsNaN(contacts.EntryTime);
Assert.IsNaN(contacts.ExitTime);
}
/// <summary>Determines where a ray will hit a box, 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="boxExtents">Extents of the axis aligned box </param>
/// <returns>The intersection points between the ray and the box, if any</returns>
public static LineContacts FindContacts(
Vector3 rayStart, Vector3 rayDirection, Vector3 boxExtents
)
{
LineContacts contacts = Line3Aabb3Collider.FindContacts(
rayStart, rayDirection, boxExtents
);
// 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);
}