Casting corners

Newbie & Debugging Questions
#1

Hello,

I have been encountering an issue lately, when trying to cast rays on a grid :

it seems my corners aren’t properly being detected. My corners either partly overlap, or there might be a gap in the corner which one can see through. I think the issue may be due to some rounding errors (which makes either vertical or horizontal intersections be detected when they shouldn’t, or not be detected when they should).

Does anyone have any idea how to workaround this ? I’d like to be able to texture my world and I won’t be able to properly do so until the corners stop overlapping.

#2

My apologies, I had’nt realised I hadn’t given many details. Say a grid is 128*128, and the top left grid starts at 0,0 and ends at 127,127.

If I cast a ray which is supposed to hit a corner, vertical intersections and horizontal intersections will not be the same. Essentially, I get this for a wall :

—|
| |
| |
| |
-----+

which means I am able in places to see through a wall and that some corners stick out when they shouldn’t.