Evening everyone,
I'm using glMultMatrixf in OpenGL to rotate my scene using the matrix:
float matrix[16] = { 1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0 };
I've been following this guide (link) but its a little bit over the top for what I need.
How could I simply rotate the x-axis by 45 degrees?
Cheers
Multiplying your transformation matrix by this rotation matrix should do the trick:
float rot45X[16] = { 1.0, 0.0, 0.0, 0.0,
0.0, cos(PI/4), -sin(PI/4), 0.0,
0.0, sin(PI/4), cos(PI/4), 0.0,
0.0, 0.0, 0.0, 1.0 };
Edit: You can also of course use the utility function
glRotatef(GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
where [x,y,z] indicate the axis of rotation (yes, it performs rotations around an arbitrary vector).
In your case you would need to call like this:
glRotatef(45, 1, 0, 0);
