iTwin Viewer - lock to top view?

[Johannes-lab]

Hi there,

is there a way to programmatically lock the iTwin viewer to a top view? Users need to be prevented from rotating and spinning the iModel around. Ideally also rotation around z-axis is locked, this is to have an 'always north' orientation.

Any sample or code snippets available?

Thanks

[pmconne]

ViewState3d.setAllow3dManipulations prevents rotating out of the XY plane.
viewport.view.setAllow3dManipulations(false);
If you want to also restrict rotation around Z you'd have to use a front stage that provides no tools capable of rotation, and override or replace the behavior of the default idle tool.