Underwater

R2026b

Underwater scene

Since R2026a

Description

The Underwater scene is a 3D environment of generic underwater. The scene is rendered with Unreal Engine^®.

Setup

To use the Underwater scene:

1. Check which scenes are installed on your local machine.

   sim3d.maps.Map.local

2. If the table does not contain "Underwater", then download the scene from the map server.

   sim3d.maps.Map.download("Underwater")

3. Add a Simulation 3D Scene Configuration block to your Simulink^® model.

4. In the Block Parameters dialog box, set the Scene source parameter to Default Scenes.

5. Set the Scene name parameter to Underwater.

To add an autonomous underwater vehicle to the scene:

1. Add a Simulation 3D Aircraft block to your Simulink model.

2. Set the Type parameter to Custom.

3. Set the Path to custom mesh parameter to /MathWorksAerospaceContent/Vehicles/Aircraft/Custom/Mesh/SK_AUV.SK_AUV.

Layout

Blocks in the Aerospace Simulation 3D library require dimensions in meters.

Scene Dimensions

This table provides the Underwater scene dimensions. The X and Y dimensions of the Underwater scene are fixed. The water depth can vary. The scene origin is at the center at the surface of the water. This means that all underwater locations have a Z coordinate that is less than zero.

Length	Width	Depth	Units
504	504	1 to 100 (default: 7)	Meters
1653	1653	3 to 328 (default: 23)	Feet

More About

Modify Scene Parameters

You can adjust the scene parameters using the Simulation 3D Message Set block. All scene parameter values should be of data type single.

To modify a scene parameter:

1. Add the Simulation 3D Message Set block to your model.

2. In the block mask, set Signal name to the parameter you want to update, such as AmbientIntensity.

3. For the parameter being updated, wire the value into the WriteMsg input port of the block and set data type to single. If using a Constant block, you can do this by setting the Output data type parameter to single in the block mask.

Parameter Values

Parameter	Description	Default	Minimum	Maximum	Units
WaterDepth	Vertical distance from the surface to the bottom of the water.	7	1	100	m

Tips

• When you select the Underwater scene from the Default Scenes list in the Simulation 3D Scene Configuration block, the Simulation 3D pack blocks synchronize with the NED input coordinate frame.

• If you have the Aerospace Blockset™ Interface for Unreal Engine Projects support package, then you can modify this scene. In the Unreal Engine project file that comes with the support package, this scene is named Underwater.

  For more details on customizing scenes, see Customize 3D Scenes for Aerospace Blockset Simulations.

Version History

Introduced in R2026a