Using more than 6 maps would cause the object not rendered.

Scenes that exceed the recommended number of texture maps will not render correctly.

Texture maps are used in material and lightmap shaders. Real-time lights also generate 1-2 maps each. These are all counted toward your scene's total texture map count. 

Recommended sizes:

Desktop 3D and Virtual Reality:

• 12 or less for fastest performance on all devices
• 16-20 maximum 

Mobile 3D and Augmented Reality:

• 4 or less for fastest performance
• 5-6 maximum (slower performance - exact limit depends on device)

To reduce texture maps:

• Delete unnecessary maps from material shaders - open the material editor panel and select the image next to the slider to delete maps individually. 
• Remove unnecessary real-time lights 

The overall performance of your BRIO scenes depends on setting constraints for all factors in your scene. View the full Performance Guide Overview for more details.