An open source library for mathematics in C++ that is free and provides several functionalities.
One of the key features of GLM is its strict adherence to the GLSL specification for the implementation, which means you can rely on it for accuracy and reliability. In fact, the developers behind GLM have gone to great lengths to ensure that the library works in the same way as GLSL, so you don't have to worry about compatibility issues when you're working with both.
If you're concerned about licensing, there's no need to worry. OpenGL Mathematics (GLM) is licensed and distributed under the terms of the MIT License, which is widely accepted as a permissive, open-source software license. This means that you can use, modify, and distribute GLM as you see fit, without any legal issues.
Overall, if you're looking for a powerful C++ math library that is specifically designed for 3D programming based on the GLSL specification, then OpenGL Mathematics (GLM) is definitely worth a closer look. With its comprehensive features and strict adherence to the GLSL specification, it's the perfect tool for developers who want to take their 3D projects to the next level.