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Minetest's fork of Irrlicht
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cutealien 7fb36849c7 vector3d scalar operator/ and operator/= no longer multiply by the inverse but use the expected division. 
That was a bad case of premature optimization.
Multiplication is indeed faster, but when working with floats this can introduce some rather unexpected inaccuracies.
Like x/x suddenly no longer being 1.0 (something guaranteed by division).
If someone really needs this back, then please add some new function which makes it clear we don't just have a typical division here.

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README.md

IrrlichtMt version 1.9

The Irrlicht Engine is an open source realtime 3D engine written in C++.

This is a fork by the Minetest developers that contains features, customizations and fixes specifically for use in Minetest.

Build

The build system is CMake.

The following libraries are required to be installed:

  • zlib, libPNG, libJPEG
  • OpenGL
    • or on mobile: OpenGL ES (can be optionally enabled on desktop too)
  • on Unix: X11

Aside from standard search options (ZLIB_INCLUDE_DIR, ZLIB_LIBRARY, ...) the following options are available:

  • BUILD_SHARED_LIBS (default: ON) - Build IrrlichtMt as a shared library
  • BUILD_EXAMPLES (default: OFF) - Build example applications

e.g. on a Linux system you might want to build for local use like this:

git clone https://github.com/minetest/irrlicht
cd irrlicht
cmake . -DBUILD_SHARED_LIBS=OFF
make -j$(nproc)

This will put an IrrlichtMtTargets.cmake file into the cmake directory in the current build directory, and it can then be imported from another project by pointing find_package() to the build directory, or by setting the CMAKE_PREFIX_PATH variable to that same path.

Platforms

We aim to support these platforms:

  • Windows via MinGW
  • Linux (GL or GLES)
  • macOS
  • Android

This doesn't mean other platforms don't work or won't be supported, if you find something that doesn't work contributions are welcome.

License

The license of the Irrlicht Engine is based on the zlib/libpng license and applies to this fork, too.

The Irrlicht Engine License
===========================

Copyright (C) 2002-2012 Nikolaus Gebhardt

This software is provided 'as-is', without any express or implied
warranty.  In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
 claim that you wrote the original software. If you use this software
 in a product, an acknowledgement in the product documentation would be
 appreciated but is not required.
2. Altered source versions must be clearly marked as such, and must not be
 misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.