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[Zack Bell]

I'm messing up this math somehow. I want to find the distance from a point to a line in a particular direction. It's probably simple, I know I've done it before.



So given that top point and the direction, I want the distance to the floor in that direction.

[zacaj]

just do a line/line intersection and then find the distance from the intersection point?

[Zack Bell]

Yep, did it. Grr. Thanks, haha.

[powly]

If the lines will be parallel and you know the shortest distance between them (let's call it straight_dist, the y difference in the image in the first post) the result you're looking for is Distance = straight_dist/sin(angle) (because sin(angle) = straight_dist/Distance = opposite/hypotenuse). This will probably save some computational costs since you'll have to compute only a sine instead of a sine and cosine for the direction from angle and a square root for the length - though this is probably completely irrelevant for your use case.

[RandyGaul]

fyi this is raycasting against a plane.