SplitScreenExtension

This extension subdivides the LMV canvas into between 2 and 4 (inclusive) separate subcanvases.

The extension id is: Autodesk.SplitScreen

For each sub-canvas, you can specify a separate model filter function to control in which canvases each model shall appear. The canvases are numbered as follows: 0 1 2 3

By default (no modelFilter), all models are rendered to each subcanvas. Overlays are rendered into both canvases (unless selection highlighting proxies - which are associated with models)

Limitations: Most core features of LMV keep working (2D/3D render, mouse-over, selection, directional zoom etc.). However, there are currently some known limitations/tradeoffs:

All canvases must use the same camera. Overcoming this requires to introduce a separate scene graph evaluation too. Subcanvas configuration is currently limited to subcanvases with the same aspect ratio. Extending that will (among others) require support for separate cameras. ZoomToolExtension, SectionTool, and Measure tool are disabled SplitScreen (we hide the UI) GroundShadow is supported, but doesn’t apply model filter yet when refreshing the shadow GroundReflection in SplitScreen is not supported yet. We currently use only a single background for both. This is hardly noticeable for discreet backgrounds like the AEC default or fixed colors, but may disturb when using more detailed environments.

var options = {
    viewports: [
        function(id) { return id === 1; },
        function(id) { return id !== 1; }
    ]
};
viewer.loadExtension('Autodesk.SplitScreen', options);