several glrotatef calls in one

OpenGL OpenGL: Basic Coding
1

can i preform the following two calls in one single?

glRotatef(90, 0, 0, -1);
glRotatef(90, 1, 0, 0);

i tried using:
glRotatef(90, 1, 0, -1);

but the result was more like a random rotation…

2

Hi !

No you cant’ look at it like this, the first example will first rotate around the Z axis and then around the X axis.

The second example will rotate around an axis somewhere between the X and Z axis so you will not do the same rotation.

The last three arguments specify the axis to rotate around.

Mikael

3

What you can do is compose a transformation matrix which will do the same. Ie generate a matrix for each rotation, then multiply the two, and then save the resulting matrix.

The anytime you can multiply this matrix times
the modelview.
…
glMatrixMode(GL_MODELVIEW);
glMultMatrix(myMatrix);

Make sure that your matrix column order. Ie
in C matrices are usually composed row order.
Just do the transpose of your composite matrix and pass that transpose to glMultMatrix.