Reddit reviews WebGL Programming Guide: Interactive 3D Graphics Programming with WebGL (OpenGL)

If someone wanted to ramp up on real-time rendering, I really feel like there are two books out there without parallel:

• 3D Math Primer for Graphics and Game Development, 2nd Edition - You could probably skip this book if you’ve done any 3D math. If not, it is an enjoyable, conversational read. I’ve admittedly only read the first half, as the second half is devoted to physics.
  
• WebGL Programming Guide: Interactive 3D Graphics Programming with WebGL - The best book I’ve found that wasn’t either a conceptual book about computer graphics or a low-level API guide. This book actually shows you how to do real 3D graphics! Transformations, textures, shading, shadows, writing GPU shaders, etc. While it does use JavaScript, it barely uses it. Anyone that knows any modern programming language can follow along. The interesting work is done in the graphics shaders anyway. My only criticism of this book is that they need to write another one! JavaScript and WebGL have gotten even more user friendly since the book was written.
  
  The last piece of the puzzle for doing rendering is learning how to debug! Each rendering debugger is kind of the same (they get ridiculously detailed on the game consoles, though). Here is an absolutely fantastic presentation about how to debug graphics, called Tightening Up the Graphics: Tools and Techniques for Debugging and Optimization.