While testing my game, I came across this severe bug where the Vector3 of hit.point (the point where the RaycastHit data hit) always returned (0, 0, 0). This happened regardless of what was hitting it, or where it actually hit. For example, when I cast a BoxcastAll between two points to determine the intersections of a road, it will correctly identify the colliders that hit, but will not correctly identify the point where it hit.
Even when the collider does indeed detect a collision that has occurred, it still returns a position that is inaccurate. (Spline0 is the collider of the road that has been intersected).
This is not a huge issue when just intersecting 1 point linearly, but it does mess with the game’s ability to intersect diagonal or multiple roads.
Diagonal Collisions
Notice how the position of the actual intersections have shifted from where it was originally intended. This is because the code uses the hit point to determine the point in which both the splines meet.
Multiple Collisions
Sometimes it works perfectly as intended because the RaycastHits were hit in the same order as the direction between the starting point and the end point.
Other times it will join and split incorrectly because the hit points need to be in order from p1 to p2 so that the splines can be split in the intersections neatly.
(Still returns (0, 0, 0) on every collision regardless of whether it collided or where it collided!)
I originally encountered this bug on #Unity-2022-2.17f1, so I decided to update to
#Unity-2022-3-LTS.22f1 (an LTS version!) to see whether this issue was resolved in an update. Although it fixed some of my collider issues, the bug in which all RaycastHit hit points return (0, 0, 0) has not been resolved.
Here is the code that I use to determine collisions for reference. I will send the entire project if requested
for (int i = 1; i < pointsRef.Count; i++) //for each point on the road
{
Vector3 p1 = pointsRef[i - 1]; Vector3 p2 = pointsRef[i]; //the starting point and the ending point of the section, as seen in the diagrams.
RaycastHit[] hits = Physics.BoxCastAll((p1 + p2) / 2 + Vector3.up, new Vector3(width, 0.1f, Vector3.Distance(p1, p2) / 2), Vector3.down, Quaternion.Euler(0, Vector3.SignedAngle(p2 - p1, Vector3.forward, Vector3.down), 0), 2, LayerMask.GetMask("Selector"));
foreach (RaycastHit hit in hits)
{
if (hit.collider != road.collider)
{
hitList.Add(hit);
Debug.Log($"{hit.collider}, {hit.point}");
//the sorting determines the position in the road where the points are, which is crucial for even intersections
hitList.Sort((a, b) =>
{
Vector3 testPoint; Vector3 compPoint; float tThis; float tComp;
m_SplineSampler.SampleSplinePoint(spline, a.point, (int)(spline.GetLength() * 2), out testPoint, out tThis);
m_SplineSampler.SampleSplinePoint(spline, b.point, (int)(spline.GetLength() * 2), out compPoint, out tComp);
if (tThis < tComp)
{
return -1;
}
else
{
return 0;
}
});
}
}
}