private static bool Overlaps(Box box, Cylinder cylinder)
{
bool isOrientable1 = box.IsOrientable;
bool isFixedVertical1 = box.IsFixedVertical;
bool isOrientable2 = cylinder.IsOrientable;
var p1 = box.Position;
var p2 = cylinder.Position;
// The cylinder is non-orientable (while the box is either non-orientable or fixed-vertical).
if (!isOrientable2 && (isFixedVertical1 || !isOrientable1))
{
// Check Y delta.
var dY = Math.Abs(p1.y - p2.y);
if (dY > (box.Height + cylinder.Height) / 2)
{
return(false);
}
// The calculations below are the same for fixed-vertical boxes, except that the boxes flat vertices
// need to be rotated relative to the cylinder.
if (isFixedVertical1)
{
p1 = p2 + box.Orientation.Inverse * (p1 - p2);
}
// Check cylinder zone (compared to the box).
var dX = Math.Abs(p1.x - p2.x);
var dZ = Math.Abs(p1.z - p2.z);
var halfBounds = box.Bounds / 2;
var withinX = dX <= halfBounds.x;
var withinZ = dZ <= halfBounds.z;
// This means that the cylinder's central axis is within the box (along the flat XZ plane).
if (withinX && withinZ)
{
return(true);
}
var radius = cylinder.Radius;
// Check X delta.
if (withinX)
{
return(dZ <= halfBounds.z + radius);
}
// Check Z delta.
if (withinZ)
{
return(dX <= halfBounds.x + radius);
}
var flatP1 = p1.swizzle.xz;
var flatP2 = p2.swizzle.xz;
var flatCorners = new []
{
new vec2(halfBounds.x, halfBounds.z),
new vec2(halfBounds.x, -halfBounds.z),
new vec2(-halfBounds.x, halfBounds.z),
new vec2(-halfBounds.x, -halfBounds.z)
};
return(flatCorners.Any(p => Utilities.DistanceSquared(flatP1 + p, flatP2) <= radius * radius));
}
// TODO: Finish this (for orientable boxes/cylinders).
return(false);
}
private static bool Overlaps(Cylinder cylinder, Sphere sphere)
{
return(false);
}
private static bool Overlaps(Cylinder cylinder, Line3D line)
{
return(false);
}
private static bool Overlaps(Box box, Cylinder cylinder)
{
// TODO: Finish this implementation.
return(false);
}
private static bool Overlaps(Cylinder cylinder, Sphere sphere)
{
// TODO: Finish this implementation.
return(false);
}
private static bool Overlaps(Capsule3D capsule, Cylinder cylinder)
{
// TODO: Finish this implementation.
return(false);
}