> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/developers/paramml-developer-guide/functions/custom-function/intersect-line1-line2-optional-number.md).

# intersect (Line1, Line2, optional Number)

This function calculates the intersection point of the given two lines. If the lines do not intersect, it returns the value \[-1, -1, -1].

If no plane is specified, the intersection is represented in 3-dimensional space. If the plane is set to 1, the intersection will be in the YZ plane (disregarding the X-axis of the points forming the line). If the plane is set to 2, the intersection will be in the XZ plane (disregarding the Y-axis of the points forming the line). If the plane is set to 3, the intersection will be in the XY plane (disregarding the Z-axis of the points forming the line).

**intersect(Line1, Line2, optional Number) → list of numbers**

This function designed to calculate the intersection point of the given two lines

**Example:**

```xml
<O N="intersectObject1" T="Project">
    <!-- created by ParamML Examples on 8/22/2023 -->
    <P N="Line1" V="[[0,0,0],[10,10,10]]" />
    <P N="Line2" V="[[10,0,10],[0,5,0]]" />
    <P N="Intersection1" V="intersect(Line1,Line2,3)" />
    <P N="Line3" V="[[0,0],[10,10]]" />
    <P N="Line4" V="[[10,0],[0,10]]" />
    <P N="Intersection2" V="intersect(Line3,Line4)" />
</O>
```

![](https://openbrim.atlassian.net/wiki/download/attachments/2167734346/image-20230822-130554.png?api=v2) As demonstrated, Intersection1 and Intersection2 returns to the intersection point coordinates. To view this example in the library, see (<https://openbrim.org/app/?incubator=1&author=ParamML_Examples_OpenBrIM+Platform&obj=objid5ly5tvpjppvns0s6j31rpe> )


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