IntersectRayBoundsFast does not give correct results when testing against bounding boxes with zero height

Using the intersectRayBoundsFast method with a boundingbox that is zero in one dimension results in false negatives.

Issue details

Consider the example below: Creating a bounding box from (3,3,0) to (4,4,0) and casting a ray from the origin (0,0,0) in the direction (1,1,0) should result in true when invoking Intersector.intersectRayBoundsFast. However, it returns false.

A workaround is to give the box "volume", as the bounding box from (3,3,-1) to (4,4,1) is intersected correctly.

Intersector.intersectRayBounds works as desired, even with the zero-coordinates.

Reproduction steps/code

import com.badlogic.gdx.math.Intersector;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.math.collision.BoundingBox;
import com.badlogic.gdx.math.collision.Ray;

public class TestClass {
    public static void main(String[] args) {
        Vector3 bottomLeft = new Vector3(3f, 3f, 0f);
        Vector3 topRight = new Vector3(4f, 4f, 0f);
        //Bounding box from (3,3) to (4,4)
        BoundingBox boundingBox = new BoundingBox(bottomLeft, topRight);
        //Ray from (0,0), direction (1,1)
        Ray ray = new Ray(Vector3.Zero, new Vector3(1f, 1f, 0f));
        System.out.println(Intersector.intersectRayBoundsFast(ray, boundingBox)); //prints "false", should print true
        System.out.println(Intersector.intersectRayBounds(ray, boundingBox, new Vector3())); //prints "true", should print true
    }
}

Version of LibGDX and/or relevant dependencies

1.9.8

Please select the affected platforms

• Windows
• Possibly others

I'll be happy to provide more clarification if needed - thank you for your time!

Start at the Intersector.intersectRayBoundsFast entry point and run the supplied Java reproduction with the zero-height BoundingBox and ray. Compare its result with Intersector.intersectRayBounds; done means the fast method returns true for the reported case without breaking the existing behavior.