1. OpenGL: OpenGL is an open-source, cross-platform graphics library that provides a set of functions for rendering 2D and 3D graphics. It is widely used in computer graphics applications and is supported by a variety of programming languages and operating systems. One key difference between OpenGL and Panda3D is that OpenGL is a low-level API, meaning that it provides low-level access to the graphics hardware, allowing programmers to have fine-grained control over the rendering process.

2. Panda3D: Panda3D is a game development engine that builds on top of OpenGL and provides a more high-level interface for creating games and simulations. It abstracts away much of the low-level details of OpenGL, making it easier to create complex graphics without having to deal with the intricacies of the underlying graphics hardware. One key difference is that Panda3D provides a scene graph, which is a hierarchical representation of the objects in a scene. This allows for easy manipulation and organization of objects in a game or simulation.

3. OpenGL: OpenGL supports multiple programming languages, including C, C++, and Python, making it highly versatile and widely accessible. It also provides a large number of features and extensions, allowing developers to implement a wide range of graphics techniques and effects. One key difference with Panda3D is that OpenGL requires a deeper understanding of graphics programming concepts and a more manual approach to rendering.

4. Panda3D: Panda3D provides a high-level scripting interface that allows developers to quickly prototype and create games without having to write extensive code. It provides a wide range of built-in functionality, such as collision detection, physics simulation, and animation, making it easier for developers to focus on the game logic rather than low-level graphics programming.

5. OpenGL: OpenGL is platform-independent, meaning it can run on various operating systems, including Windows, macOS, and Linux. It also supports a wide range of hardware, including desktop computers, laptops, and mobile devices. One key difference is that OpenGL can take advantage of specific hardware features and optimizations, allowing for high-performance graphics rendering on supported devices.

6. Panda3D: Panda3D provides a set of higher-level abstractions and convenience features that make it easier to create complex graphics and gameplay systems. It includes support for advanced rendering techniques, such as shaders, material systems, and post-processing effects. This allows developers to create visually stunning games and simulations without having to dive into the specifics of low-level graphics programming.

In Summary, OpenGL is a low-level graphics library that provides fine-grained control over the rendering process, while Panda3D is a higher-level game development engine built on top of OpenGL, providing abstractions and convenience features for easier game development.