Textbook Errors¶

The WebGL programs in this textbook were verified to execute correctly as of April 2018 in the following environments:

• macOS Sierra, version 10.12.6, using Chrome Version 65.0.3325.181
• Windows 7 Enterprise, Service Pack 1, using Chrome Version 65.0.3325.181
• Ubuntu 16.04 LTS (in a VMWare Player), using Firefox 59.0.1 (64-bit)

The following are unresolved errors in this textbook as of April 2018:

• Lesson 11.6 on Procedural Texture Mapping
  Section “Designing Overlay Patterns”:
  
  • On Ubuntu using Firefox, the WebGL program generates no errors to the console window, but does not render any graphics.
  • The WebGL programs executes correctly on the other platforms.
    
    
• Lesson 11.9 on Heightmaps and Displacement Maps
  All three WebGL programs:
  • On Ubuntu using Firefox, all three WebGL programs do not execute because the WebGL 1.0 implementation does not allow texture2D calls in vertex shaders.
  • The WebGL programs execute as desired on the other platforms.
    
    
• Lesson 12.4 on Transparency
  Sections: “Experimentation” and “Experiment with overlapping transparent surfaces”
  
  • On Ubuntu using Firefox, the WebGL program renders random artifacts on some of the transparent surfaces.
  • The WebGL programs execute as desired on the other platforms.
    
    
• Lesson 12.5 on Color Blending
  Sections: “Experiment with color blending” and “Experiment with color blending”
  
  • On Ubuntu using Firefox, the WebGL program renders random artifacts on some of the transparent surfaces.
  • The WebGL programs execute as desired on the other platforms.
    
    
• Lesson 12.8 on Particle Systems
  Section “Experimentation”
  
  • On Ubuntu using Firefox, the WebGL program does not render the particle system and no errors are reported to the console window.
  • The WebGL program executes as desired on the other platforms.
    
    
• Lesson 12.11 on Overlays
  Section “Example: Graphics Under Text”
  Section “3D Graphics in Front of Text”
  Section “A Fullscreen Example”
  
  • On Ubuntu using Firefox, the WebGL program does not perform alpha blending correctly at the boundaries of the model.
  • The WebGL program executes as desired on the other platforms.
    
    

Please report any problems with this textbook to https://github.com/WayneBrown/learnwebgl2/issues. THANKS!