Post by krotus on Mar 24, 2020 20:45:21 GMT
So I was stuck trying to render my sphere silhouette for a couple of days. Every ray produced a "hit".
Quoting from the book:
The hit will never be behind the ray's origin, since that's effectively behind the camera, so you can ignore all intersections with negative t values when determining the hit. In fact, the hit will always be the intersection with the lowest nonnegative t value.
When I wrote the hit function, I wrote it so that if an object intersection's units from the ray's origin was greater than or equal to zero, then it was a hit, simply based upon the wording in the book. How I got the silhouette to render was changing the code from "greater than or equal to zero" to "greater than zero".
Now, sitting here writing this, seeing myself explain it, I guess that it makes sense. I'm just wondering if that's accurate - that zero units from a ray's origin is not a hit.