Hi ! Is there any way to find an intersection between two segments ? Or rays ? I searched the Ray doc and I found that there is methods for finding an intersecting vector with triangles, boxes, and spheres, so I am surprised to find none with segments.

Hi! Could you explain it more detailed? What segments? Segments of what?

As “segments” I mean arrays of two vector3. the intersecting vetor3 between [ [0,5,0], [0,-5,0] ] and [ [5,0,0], [-5,0,0 ] ] would be [0,0,0].

AFAIK, there is no such functionality “out-of-the-box” in Three.js. Are points of those two lines (segments) always co-planar? Do those lines (segments) always intersect?

Thanks anyway, But it is surprising, as Ray.intersectBox() can find an intersecting vector between a ray and a three-dimensional object, I’d expected that the functionality was available as well for an (a priori) simpler task (intersection between two rays). I will try to find a workaround and keep…

Just out of curiousily, why do you want to use finding intesection between lines? What’s the task? :slight_smile:

I want to make a function to offset polylines (array of vector3) according to their bisectors. In order to code a parametric geometry. (so the user can change the shape of the polyline, and the offset will adapt).

Could you provide an explanatory picture?

[2019-02-01_171343] In blue the base polyline, in black the polyline offset from the blue according to bisectors.

Maybe this topic will be useful for you: [image] OffsetContour function Resources There’s a question on SO: And a forum topic: With some changes of the ProfiledContourGeometry, there is a function which offsets points of a contour - OffsetContour : http://jsfiddle.net…

Thank you, I will use that as a starting point !

How to find segments intersection?

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prisoner849 February 1, 2019, 9:18am 10

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How to find segments intersection?

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