/* FUNCTION: GLCreateModelViewMatrix
ARGUMENTS: m destination matrix
x,y,z position
yaw compass direction, 0-north, 90-east, 180-south, 270-west
pitch azimuth, -90 down, 0 forwad, 90 up
roll rotation around forward axis
RETURN: n/a
DESCRIPTION: Position camera
*/
void GLCreateModelViewMatrix(float *m, float x, float y, float z, float yaw, float pitch, float roll)
{
// same as gluLookAt
Quaternion q, qDir, qAzim;
qAzim.GenerateLocalRotation(pitch + 90.0f, -1.0f, 0.0f, 0.0f);
qDir.GenerateLocalRotation(yaw, 0.0f, 0.0f, 1.0f);
q = qAzim * qDir;
if (roll != 0)
{
Quaternion qTilt;
qTilt.GenerateLocalRotation(roll, 0, 0, 1);
q = qTilt * q;
}
q.CreateRotatedQuaternion(m);
// move camera
float mov[16];
GLCreateIdentityMatrix(mov);
mov[12] = -x;
mov[13] = -y;
mov[14] = -z;
GLMatrixMultiply(m, m, mov);
}
