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autodesk-forgeautodesk-viewerautodeskforge

How to Make Autodesk Viewer Orthographic by Default

I am trying to make the autodesk viewer display files in orthographic mode by default. So far the best solution i've come up with is the following:

forgeViewer.addEventListener(
    Autodesk.Viewing.GEOMETRY_LOADED_EVENT,
    function setOrtho() {
      forgeViewer.autocam.homeVector.isPerspective = false;
      forgeViewer.autocam.homeVector.isOrtho = true;
      forgeViewer.autocam.originalHomeVector.isPerspective = false;
      forgeViewer.autocam.originalHomeVector.isOrtho = true;
      forgeViewer.autocam.toOrthographic();
    },
  );

This sets home to orthographic and sets the current view to orthographic which is exactly what i'm looking for. The only issue i have is that waiting on the GEOMETRY_LOADED_EVENT means that larger models will load in perspective and then snap to orthographic when all of the geometry is loaded, which can be jarring for users.

Is there a way to get the viewer to initialize in orthographic sooner so that it doesn't do this? I've tried waiting on a few other events as well as running setOrtho immediately with no event listener and usually it fails to get picked up.

Solution

  • You can set orthographic view as early (and might work even earlier) as Autodesk.Viewing.MODEL_ROOT_LOADED_EVENT:

    NOP_VIEWER.addEventListener(Autodesk.Viewing.MODEL_ROOT_LOADED_EVENT, ()=>{
   //...
}

    See live demo here - LGTM.

    You can also try viewer.debugEvents(true) (and here's the doc to explain them) to print all the events to console and see which one gets called earlier to suit your needs.