# Creating Special Object Types

Spaces types listed below in the 3D model is represented by following Special Object Type guideline. Click on each special object type to see details.

* [Large open space with more than one level with mezzanine (ie Auditorium, etc.)](#large-open-space-with-more-than-one-level)
* [Space with sloped floor](#space-with-sloped-floor-ramps)
* [Stairwells and other Vertical Circulations](#stairwells-and-other-vertical-circulations)

## Large Open Space with More Than One Level

From an analysis perspective it is generally difficult to deal with masses that span multiple levels. Therefore we recommend the approach of modeling a singular mass per level.

Often when modeling a large open space we result in a single complex polysurface as this:

<figure><img src="/files/sYRSujDyTLKcR8YFUFFr" alt=""><figcaption></figcaption></figure>

We instead recommend that you model it so that it is a single space per level as such:

<figure><img src="/files/7HBSGLE6UFLqLoMQOeWs" alt=""><figcaption></figcaption></figure>

## Space with Sloped Floor (Ramps)

For any downward facing face to be considered as a floor must have an incline of less than 1/6, as that is the maximum allowed slope in many countries. Any surface steeper than that will not be considered a floor.

<figure><img src="/files/I5vpjKOBWwtkUWmM33HY" alt=""><figcaption></figcaption></figure>

## Stairwells and other Vertical Circulations

We Recommend you model masses for stairwells and other vertical circulations such as elevator shafts just like any other masses: By their area boundaries as blocks.&#x20;

<figure><img src="/files/SHZmLMcKcYttvjho1Dxj" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.deepform.net/rhino-3d-modeling-guide/creating-special-object-types.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.