OpenGLContext A Learning Environment for PyOpenGL

Introduction

OpenGLContext is a testing and learning environment for PyOpenGL. It provides a generic scenegraph engine (based on VRML97's scenegraph model) as well as basic context creation and interaction support in multiple GUI environments. Recent work adds a modern OpenGL 3.3 core-profile renderer, a physically based rendering (PBR) pass, and a glTF 2.0 loader and viewer.

Quick Links

• Documentation
• Installation
• Related projects on GitHub
• OpenGLContext
• PyVRML97
• TTFQuery
• SimpleParse
• PyDispatcher

Features

• Works on Multiple GUI Environments with Keyboard, Mouse and GUI events
• GLFW (recommended for core-profile / PBR rendering)
• GLUT
• Pygame
• wxPython
• Qt (using the optional OpenGLContext-qt project)
• Provides Basic Interactivity
• 3D Flying Mode
• Examine Mode
• Walking Mode (Physics Based)
• FPS Mode (Physics Based with Mouse Look)
• Selection rendering based on unique-color buffers
• Timer mechanisms and simple event handling
• Geometry Types
• Points (and Point-sprites)
• Lines
• Polygons
• Trimmed NURBs
• Extruded Shapes, Lathes, Screws and Spirals (with GLE)
• Boxes, Spheres, Cylinders, Cones, Nurbs Teapot
• Text — TrueType, as a screen-space texture atlas, 3-D polygonal solids, or 3-D outlines
• glTF meshes — skinned, morph-target and vertex-deformed, with PBR materials
• Terrain — splat-textured height fields, and streamed 3D Tiles datasets
• Vegetation — instanced billboards, grass clumps and near-mesh LOD
• Textures (with Pillow), Materials, and physically based (PBR) materials
• Rendering
• Legacy fixed-function pipeline (compatibility profile)
• Modern shader pipeline (OpenGL 3.3 core profile)
• Image-based lighting and dynamic shadows
• Shader scenegraph nodes
• Particle effects — fire, smoke, sparks and explosions in one instanced draw
• Spatial audio — sound placed in the scene on glTF's KHR_audio_emitter model, mixed in numpy by the standalone omi_audio engine
• HUD & developer overlay — reticule, meters and messages over a live world, and a provider-fed overlay of everything a player should never see
• Optimizations
• Caching infrastructure
• Frustum culling
• CPU node-path matrix calculation (forward/backward transforms)
• Loaders
• glTF 2.0 / GLB loader and viewer
• Tiles3D Loader (octree glTF terrain)
• VRML97 loader (SimpleParse is a required dependency)
• Wavefront OBJ loader
• BSP (Quake III file loader/viewer, with the twig-bb project)