Getting all ray intersections instead of only the first one

Asked Dec 24 '18 at 14:00

Active Dec 24 '18 at 14:00

Viewed 44 times

I am using the X3DOM library for JavaScript. With the function X3DOM.runtime.shootray(x, y) it is possible to receive the first object that the ray hits and the coordinates of the spot. The problem is, all my objects are placed on a plane ("floor") and I need the intersection point between the ray and the floor rather than with the objects on it.

Any solution idea? Some of my ideas were:

Let the ray go all the way and receive all intersections rather than stopping on the first hit object
Make the ray somehow pass through the objects and hit the floor (make the objects "invisible")

But I couldn't find any way to accomplish any of this. I'd be thankful for a bit of help.

asked Dec 24 '18 at 14:00

Liglo App

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If the floor is a fixed plane then you can use some vector math to compute the intersection directly – meowgoesthedog Dec 24 '18 at 14:44
@meowgoesthedog I have absolutely no idea how to do it! – Liglo App Dec 24 '18 at 14:54
There are plenty of results for "Ray-plane intersection". A good example on SO is https://stackoverflow.com/questions/23975555/how-to-do-ray-plane-intersection – meowgoesthedog Dec 24 '18 at 14:55

Getting all ray intersections instead of only the first one

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