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Freelook problem

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Hello, i trying to code a freelook with third axis, but i am little bit stuck :)

if( fr->_input->KeyDown( 'A' ) )
if( fr->_input->KeyDown( 'D' ) )
if( fr->_input->KeyDown( 'W' ) )
if( fr->_input->KeyDown( 'S' ) )
if( fr->_input->KeyDown( 'Q' ) )
if( fr->_input->KeyDown( 'E' ) )

cam->_lookat->z = cam->_position->z + cos( yrot )* cos(xrot);
cam->_lookat->x = cam->_position->x + sin( yrot );
cam->_lookat->y = cam->_position->y + sin( xrot );

cam->_up->y = cos( zrot );
cam->_up->x = sin( zrot );

fr->MatrixLookAtLH(cam->_view, cam->_position, cam->_lookat, cam->_up);
fr->SetTransform( D3DTS_VIEW, cam->_view );

i made this freelook, which works and rotates camera only around X and Y axis. Could anybody here help to make it for third axis ? thank you very much.

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