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# How to prepare uploaded architecture for simulations

To ensure a smooth and realistic simulation, the uploaded architecture needs to be prepared carefully. 
The following guidelines help maximise both performance and simulation quality.

## Requirements

### Model all doors in the open position

All doors must be modelled in their open state. 
Since doors cannot be moved interactively during the simulation, their position at the time of export defines how they appear in VR. 
Closed doors block passageways and make navigation impossible.

### Reduce the file to the relevant area

Only upload the part of the building that will actually be used in the simulation – for example, a single floor or a specific functional zone.
Unnecessary geometry increases file size, slows down the import process, and reduces performance in the VR application.

|| Tip: For guidance on reducing file size, see the support article
[My file is too large](https://support.hegias.com/de/article/meine-datei-ist-zu-gross-yowq7a/).

### Omit dynamically placed objects

Any elements intended to be placed or repositioned interactively during the simulation (e.g. medical equipment, furniture, fixtures) must not be included in the architecture file. 
These are added separately to the scene via the HEGIAS library.

### Keep interior fittings low in detail

Fixed built-in elements (fitted cupboards, wet rooms, kitchenettes) may remain in the file but should be modelled with as low a polygon count as possible. 
What matters for simulation is accurate dimensions and a true sense of space – not the visual fidelity of individual objects. 
High-resolution built-in elements can significantly impact performance.

## Recommendations

### Ceiling as a separate group or file

Where possible, the ceiling should be organised as its own group or as a separate file. 
This allows it to be shown or hidden during the simulation, making it easier to get a clear overview from a top-down perspective.

### Room labels

If your CAD workflow supports it, labelling rooms with their functional names (e.g. "OR 1", "ICU", "Storage") is recommended. 
These labels help all simulation participants orient themselves and facilitate communication during the exercise.