code: def draw_vr_anaglyph(cube_fbo, vr_scene, active_scene, eye_poses=(.035, -.035)):
      
      color_masks = [(True, False, False, True), (False, True, True, True)]
      cam = vr_scene.camera
      orig_cam_position = cam.position.xyz
  
      for color_mask, eye_pos in zip(color_masks, eye_poses):
          gl.glColorMask(*color_mask)
          cam.position.xyz = cam.model_matrix.dot([eye_pos, 0., 0., 1.])[:3]  # inter_eye_distance / 2.
          cam.uniforms['playerPos'] = cam.position.xyz
          with cube_fbo as fbo:
              vr_scene.draw360_to_texture(fbo.texture)
          cam.position.xyz = orig_cam_position
          active_scene.draw()
docs: Experimental anaglyph drawing function for VR system with red/blue glasses, used in Sirota lab.
      Draws a virtual scene in red and blue, from subject's (heda trackers) perspective in active scene.
  
      Note: assumes shader uses playerPos like ratcave's default shader
  
      Args:
          cube_fbo: texture frameBuffer object.
          vr_scene: virtual scene object
          active_scene: active scene object
          eye_poses: the eye positions
  
      Returns: