s3d_angle_to_cam - calculate angle between vector and cam

SimonWunderlich
           Author of s3d

s3d                                                                                          S3D_ANGLE_TO_CAM(3)

       Given obj_pos and cam_pos in the format float[3], angle_rad about which angle the object should be
       rotated around the y-axis so that it faces the camera. This might become handy if you have some text
       floating in space and want it to face the camera. http://en.wikipedia.org/wiki/Vector_(spatial)

       s3d_angle_to_cam - calculate angle between vector and cam

#include<s3d.h>floats3d_angle_to_cam(constfloatobj_pos[],constfloatcam_pos[],float*angle_rad);