Using Quaternions for OpenGL Rotations [duplicate]

by

All you have done is effectively implement Euler angles with quaternions. That’s not helping.

The problem with Euler angles is that, when you compute the matrices, each angle is relative to the rotation of the matrix that came before it. What you want is to take an object’s current orientation, and apply a rotation along some axis, producing a new orientation.

You can’t do that with Euler angles. You can with matrices, and you can with quaternions (as they’re just the rotation part of a matrix). But you can’t do it by pretending they are Euler angles.

This is done by not storing angles at all. Instead, you just have a quaternion which represents the current orientation of the object. When you decide to apply a rotation to it (of some angle by some axis), you construct a quaternion that represents that rotation by an angle around that axis. Then you right-multiply that quaternion with the current orientation quaternion, producing a new current orientation.

When you render the object, you use the current orientation as… the orientation.

More Related Contents:

  1. OpenGL – Index buffers difficulties
  2. Normal mapping gone horribly wrong
  3. How to render offscreen on OpenGL? [duplicate]
  4. Calculating normals in a triangle mesh
  5. What is the proper OpenGL initialisation on Intel HD 3000?
  6. How to render an openGL frame in C++ builder?
  7. Drawing Sphere in OpenGL without using gluSphere()?
  8. Multithreaded Rendering on OpenGL
  9. Why is the sprite not rendering in OpenGL?
  10. Declaring multiple object pointers on one line causes compiler error
  11. Camera position in world coordinate from cv::solvePnP
  12. When does OpenGL get finished with pointers in functions?
  13. How to draw text using only OpenGL methods?
  14. Mesh class called with default constructor not working OpenGL C++
  15. Segmentation fault at glGenVertexArrays( 1, &vao );
  16. Generating a normal map from a height map?
  17. How do I draw text with GLUT / OpenGL in C++?
  18. Image scaling (KeepAspectRatioByExpanding) through OpenGL
  19. Qt3d. Draw transparent QSphereMesh over triangles
  20. 2D Diamond (isometric) map editor – Textures extended infinitely?
  21. object loader in opengl
  22. How to use glOrtho() in OpenGL?
  23. OpenGL GL_POLYGON concave polygon doesn’t color in
  24. Easy framework for OpenGL Shaders in C/C++
  25. Understanding glm::lookAt()
  26. Cmake link library target link error
  27. Where can I get windows.h for Mac?
  28. Concave GL_POLYGON doesn’t color in?
  29. How do I rotate a Quaternion with 2nd Quaternion on its local or world axes without using transform.Rotate?
  30. true isometric projection with opengl

Leave a Comment