I read somewhere that couple of experienced programmers can create a 3d engine from scratch within two months. Hope that answers your question. But the for starters it maky take longer. Basically if the objective of a 3d engine is to only create a 3d pong, then begineers can make it in 3-4 weeks.

Just fyi, if any part of a codebase uses GPL, the entire codebase must be licensed under GPL or equivalent. This means, if you use GPL code in a library, game, or engine, you don't have a choice of whether it's opensource or not: It is legally required to be opensource by the license.

And that is why MIT license is the King of all licensees

The CC BY 3.0 is also very useful.

Just fyi, if any part of a codebase uses GPL, the entire codebase must be licensed under GPL or equivalent. This means, if you use GPL code in a library, game, or engine, you don't have a choice of whether it's opensource or not: It is legally required to be opensource by the license.

And that is why MIT license is the King of all licensees

The CC BY 3.0 is also very useful.

Sony likely decided to use FreeBSD as the basis of the internal OS on the PS4 purely due to the permissive BSD 2-Clause license rather than any technical superiority that the OS has over Linux.

I think any version of the GPL license makes game studios itchy ;)

Then again, talking about licenses at this stage of engine development is perhaps not very productive. Get the engine built first and you can always swap out the parts using unworkable licenses.

Sony likely decided to use FreeBSD as the basis of the internal OS on the PS4 purely due to the permissive BSD 2-Clause license rather than any technical superiority that the OS has over Linux.
I think any version of the GPL license makes game studios itchy ;)
Then again, talking about licenses at this stage of engine development is perhaps not very productive. Get the engine built first and you can always swap out the parts using unworkable licenses.

Just fyi, if any part of a codebase uses GPL, the entire codebase must be licensed under GPL or equivalent. This means, if you use GPL code in a library, game, or engine, you don't have a choice of whether it's opensource or not: It is legally required to be opensource by the license.

And that is why MIT license is the King of all licensees

The CC BY 3.0 is also very useful.

That's why the blender game engine is having problems.

The Blender Game Engine isn't having problems in that regard. The issue is that most people are users and not developers, license notwithstanding

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Just fyi, if any part of a codebase uses GPL, the entire codebase must be licensed under GPL or equivalent. This means, if you use GPL code in a library, game, or engine, you don't have a choice of whether it's opensource or not: It is legally required to be opensource by the license.

Yes, we are finishing off our second title and we will be leaving our current engine and moving on to using our own.. Mainly general purpose, we have RPG and FPS prototypes working in it but a fair few kinks that need to be sorted out. We will be licensing it out after that:

Features that are in ShadowEngine V0.1, due for the Aug 2015 release:

64-Bit Editor
Nvidia Physx 3
Language support: C++ and C#
Direct X and open GL support
Custom shaders will be allowed
Data clustered streaming with compression algorithm
Track animation with cutscene system
Deferred lighting and HDR support
Post effects suite: DOF, BOKEH, Bloom, Motion Blur, Colour correction, DSSDO, SSAO, Edge detection, AA
Real time GI (Voxel based, spherical harmonic indirect lighting)
Internal runtime compiler
Terrain creation suite

Supported platforms, PC and Mac..