Find the intersection of two line segments. Return `[]`

if lines don't intersect.

**Since:** 2.4

## Parameters

`line1`

: Two points of 2D or 3D line1.`line2`

: Two points of 2D or 3D line2.`ext`

: Default to`false`

, which doesn't extend a line to an intersection with another line.`epsilon`

: An upper bound on the relative error due to rounding in floating point arithmetic. Default to 0.0001.

## Examples

```
use <lines_intersection.scad>;
line1 = [[0, 0], [0, 10]];
line2 = [[5, 0], [-5, 5]];
line3 = [[5, 0], [2.5, 5]];
assert(lines_intersection(line1, line2) == [0, 2.5]);
assert(lines_intersection(line1, line3, ext = true) == [0, 10]);
line4 = [[0, 0, 0], [10, 10, 10]];
line5 = [[10, 0, 0], [0, 10, 10]];
assert(lines_intersection(line4, line5) == [5, 5, 5]);
```