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What is Three.js?
Three.js is a cross-browser open source JavaScript library and application programming interface (API) used to create and display animated 3D and 2D computer graphics in a web browser using WebGL. The source code is hosted in a repository on GitHub.
It uses WebGL API behind the scene.  Three.js allow you to use your GPU(Graphics Processing Unit) to render the Graphics and 3D objects on a canvas in the web browser. since we are using JavaScript so we can also interact with other HTML elements.

What is Babylon.js?

Babylon.js is a real time 3D engine using a JavaScript library for displaying 3D graphics in a web browser via HTML5. The source code is available on GitHub and distributed under the Apache License 2.0.

As with any other 3D library it provides built-in functions to help you implement common 3D functionality more quickly.

Well, a clear answer is not easy to find out there, as companies that profit from this segment of the market tend to give vague explanations about their products in order to not alarm the world too much and keep you using and buying their technology. Even if some process or material could be really effective to produce certain objects we should keep in mind that not all technologies are good for our planet. It should not be hard to determine when a technology becomes inconvenient, I believed this is when it is used to produce things that can be made in a sustainable way.

Unlike fused deposition 3d printing technologies (FFF, FFD,FDM) where 3d printed items are made using thermal plastics in form of pellets of filaments extruded trough one or more hot nozzles, resin 3d printers (SLA, DLP, LED/LCD, LFS) use light-reactive thermoset liquid materials called “resins” to create the 3d printed layers.

In CNC machining, G codes and M codes work together to manufacture parts and components:

• G code controls the movements of a machine, dictating how and where a machine should move to fabricate a part.
• M code controls miscellaneous machine functions,this includes instruction on when to turn on or off operations not involved with cutting.

Many physicists played a part in solar cell invention.

The main steps that led to the development of photovoltaic technology can be summarized as follows: