> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/workflows/daylight/grid.md).

# Grid

{% hint style="info" %}
Grid inputs are typically determined by a building code, guideline or rating tool the daylight simulation compares against.
{% endhint %}

<figure><img src="/files/eACrsOMAQ01znODduxx4" alt=""><figcaption></figcaption></figure>

### Plane Height

The plane height or working plane is the height above the floor level in your daylight simulation in meters. Typically, this height is set at the average height of the desks' top surface above the floor, commonly ranging from 0.7 to 0.8 meters.&#x20;

### Grid Size

The grid size is set in metres, dividing up the working plane when calculating illuminance. Larger values will speed up calculations but give lower resolution in daylighting outputs. Conversely, smaller values increase the simulation time and produce more accurate results. A typical grid size is between 0.2 and 0.5 m, subject to the size of the space being modelled.&#x20;

### Grid Source (Preview)

The Grid Source (Preview) enables you to determine how the grid is generated - via automated areas, manually, or combined. Manual Grids are defined at the [Level ](broken://pages/0O2fyeXUn7lGtqUWpIeP)of the model.

### External Boundary Margin

An external boundary margin (m) sets an offset from the building envelope line where illuminance data is not to be included in the results.  This option is used to avoid the inclusion of potentially misleading illuminance data close to walls and windows, typically set at 0.2 m.

### Internal Walls Margin

An internal boundary margin (m) sets an offset from the internal walls where illuminance data is not to be included in the results. This option is used to avoid the inclusion of potentially misleading illuminance data close to internal walls, typically set at 0.2 m.

### Shading Margin

A shading margin (m) sets an offset from enclosed geometry features where illuminance data is not to be included in the results. This option is used to avoid the inclusion of potentially misleading illuminance data close to the enclosed geometry feature, typically set at 0.2 m.

### Grid Corners

Grid corners are set to determine how corners of the grid are drawn when a margin is applied.

### Gradient

A gradient determines the colour gradient for the sensor grid when the results are viewed.


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