construct rotation matrix

[huangzl99]

hi, I construct the rotation matrix with opengl, like this:

main(){
double angle=90.0, temp[16],aixs[3];
axis[0]=0;
axis[1]=1;
axis[2]=0;

glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotated(angle,axis[0],axis[1],axis[2]);
glGetDoublev(GL_MODELVIEW_MATRIX,temp);
//temp is the rotation/trans matrix
....
}

but when I run it, temp simply dose not been changed by the opengl, what wrong with this code? it there an initialization to opengl?


need help, thanks you.

[chowe6685]

Well first of all, I'm not sure why you are doing this to get a rotation matrix, wouldn't it just be easier to make one yourself, there are tons of documents about them online, but try loading the identity matrix before you rotate it

[Tron]

@chowe6685:
there IS a LoadIdentity...

@huangzl99:
is that the whole code?
you MUST have an active OpenGL rendering context to issue ANY OpenGL commands (even glGetString)