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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
There are two versions of DEM model (one is very large) you can test it in your local environment. I’ve used the small version for the demo. https://zhunor.github.io/threejs-dem-visualizer/ https://github.com/zhunor/threejs-dem-visualizer
There are plenty of good examples in Github but I’ll go forward with the https://github.com/jackdbd/threejs-es6-webpack-starter because it has all of the features I need and more and also easy to understand.
Tutorials of https://github.com/jonathanlurie/ThreejsDEM and http://blog.mastermaps.com/2013/10/terrain-building-with-threejs.html was extremely helpful. Thank you guys.