Can you elaborate more on what is not working with your code. There are a
lot of algorithms for axis aligned bounding box and ray intersections. This
<http://www.realtimerendering.com/intersections.html> is a good resource
for such algorithms.
Also, I see that your function is either returning `None` or some float
value (t_min). Usually, the intersection algorithms return a boolean -
`True` for an intersection, `False` otherwise.
The algorithm you have posted seems alright to me except that you need to
return a bool. Probably this should be -
def box_aabb_intersect(bbox_min, bbox_max, ray, direction):
t1 = (bbox_min.x - ray.x) * direction.x
t2 = (bbox_max.x - ray.x) * direction.x
t3 = (bbox_min.y - ray.y) * direction.y
t4 = (bbox_max.y - ray.y) * direction.y
t5 = (bbox_min.z - ray.z) * direction.z
t6 = (bbox_max.z - ray.z) * direction.z
t_min = max(max(min(t1, t2), min(t3, t4)), min(t5, t6))
t_max = min(min(max(t1, t2), max(t3, t4)), max(t5, t6))
return t_max >= t_min
On Wed, May 17, 2017 at 4:50 PM, Rémi Deletrain <[email protected]>
wrote:
> Hello everybody,
> I try to make a code find an intersection between a ray and a box. I read
> a lot of thing on the internet and one of the best code I could find is
> this one.
>
> def box_aabb_intersect(bbox_min, bbox_max, ray, direction):
>
> t1 = (bbox_min.x - ray.x) * direction.x
> t2 = (bbox_max.x - ray.x) * direction.x
> t3 = (bbox_min.y - ray.y) * direction.y
> t4 = (bbox_max.y - ray.y) * direction.y
> t5 = (bbox_min.z - ray.z) * direction.z
> t6 = (bbox_max.z - ray.z) * direction.z
>
> t_min = max(max(min(t1, t2), min(t3, t4)), min(t5, t6))
> t_max = min(min(max(t1, t2), max(t3, t4)), max(t5, t6))
>
> if t_max < 0.0 or t_min > t_max:
> return
>
> return t_min
>
>
> Everyone says it works but I can not make it work at home. Does someone
> have an idea?
>
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