dir to glRotate by taby

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// jyk from gamedev.net: // x,y,z are direction vector components float yaw = 0.0f; if(fabsf(dir_x) < 0.000001 && fabsf(dir_z) < 0.000001)     yaw = 0.0f; else     yaw = atan2f(dir_x, dir_z); float pitch = -atan2f(dir_y, sqrt(dir_x*dir_x+dir_z*dir_z)); // to help convert radians to degrees static const float rad_to_deg_mul = 180.0f/3.14f; // Convert to degrees here glRotatef(yaw*rad_to_deg_mul, 0.0f, 1.0f, 0.0f); glRotatef(pitch*rad_to_deg_mul, 1.0f, 0.0f, 0.0f);