progressive rendering

There is a related function that I would love to see in the product, multiple levels of detail support. It would be nice to be able to load low LOD models quickly first and then load high LOD in the background.
I can do this today, but it takes a little coding and puzzles to achieve this. It would be nice to have a standard solution for this. This is not an urgent request.

Hi Yuri,
In the scenario that I was describing, I had a 3D scene with a large number of triangles. The customer generated the geometry from CAD, and it had a high level of detail. It would have been very time consuming to clean up all of the geometry in the CAD files to reduce the size of the BIN file. The goal of the project was to reduce the initial load time that the user would experience and preserve the high level of detail. To do this, I created two 3D scenes: a high LOD and a low LOD.
-The high LOD scene is the original scene as exported from CAD.
-The low LOD scene was produced from the high LOD scene. I made a very rough reduction of LOD using the tools in Blender, such as decimate and delete.
The low LOD file was about 10% the size of the high LOD file. Verge3D was able to load the low LOD file in just a few seconds, but the appearance was poor (as should be expected).
Once Verge3D renders the low LOD file to the screen, I use JS to initiate the loading of the high LOD files. This process gives the user something to look at and inspect while his computer is downloading and compiling the high LOD file.
The code is trivial. I added a function call to the runCode() function that looks something like this:

function runCode(app) {
    app.ExternalInterface.loadHighLOD();
}

It calls a function in the puzzles that loads the highLOD. See attached screenshot. This is an older example, and the puzzles and JS need to be updated to work with 3.1, but the idea should still work.
The tricky part is making your puzzles work correctly, depending on whether the low or high LOD file is loaded.
It would be nice to have a toolchain and framework that automated some of these steps and was able to load different LODs intelligently, but, as I said, this is not urgent. Thanks!

Hi Yuri. Yes, your solution works for me. Thank you.
I still think about JavaScript before puzzles, but I am trying to break that habit.

In the long term, I want to come up with a workflow to automate the production and export of a scene with various LODs with a single click. This process has many manual steps right now. Also, I need to develop a set of puzzles that loads the LODs more intelligently. My current solution is very manual and brittle. This is a criticism of my solution, not of Verge3D.
Thanks again.