Problem:
I have a racing circuit that is made out of tiles, each of which is made out of 2 triangles. I need to know over which tile my craft is hovering on; but since there are tiny holes between some of the tiles, casting a ray fails sometimes.
Note: fixing the mesh from within a 3D modeler is not an option.
Question:
Is there a robust method for approaching this problem ?
As DMGregory has pointed out in the comment, you can use SphereCast instead. A spherecast works a lot like a raycast, only that instead of checking for hits in a single line, it has a 'radius' parameter which defines the size of the sphere, effectively making it behave like a thick ray.
Example:
RaycastHit hit;
if(Physics.SphereCast(transform.position, 0.1f, Vector3.down, out hit)){
...
}
You can easily change your code by replacing Physics.Raycast with Physics.SphereCast, and passing a float value after the origin parameter depending on how big the holes are.
The only solution I can think of is to use two or more raycasts that are placed close together but not in the same position. That way if one misses due to a mesh seam, the other should hit.
