> For the complete documentation index, see [llms.txt](https://interopxyz.gitbook.io/surface-plus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://interopxyz.gitbook.io/surface-plus/components/analysis/is-singular.md).

# Is Singular

Test if a surfaces edge length has been collapsed to 0

## Description

Test if a surfaces edge length has been collapsed to 0

{% tabs %}
{% tab title="Preview" %}
![](https://2925950326-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDjVBCv0zXotDtlYfQEkm%2Fuploads%2FO5UZlXw4K5h8soRMTk01%2FSurface_Singular.png?alt=media\&token=2969c318-aea1-45bd-90c5-cda2dd2fb4f9)
{% endtab %}

{% tab title="Location" %}
**Name** | Is Singular

**Nickname** | Singular

**Tab** | Surface

**Panel** | Analysis

**Division** | 2
{% endtab %}

{% tab title="Inputs" %}
**S** | **Surface** (*surface*) | A nurbs surface

**D** | **Direction** (*int*) | The direction to test (-1 = Any, 0 = South, 1 = East, 2 = North, 3 = West)
{% endtab %}

{% tab title="Outputs" %}
**S | Is Singular** (*bool*) | True if the edge is collapsed
{% endtab %}

{% tab title="Mode" %}
*none*
{% endtab %}
{% endtabs %}

## Usage