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Virtual Reality Blueprints by John Williamson, Charles Palmer

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Targeting reticle cursor

In the real world, reticles are used in microscopes and telescopes as a sighting aid. In games and VR, we use it for the same purpose, but we have a slightly different approach to their implementation. In 2D games, we can get away with attaching a sprite to the primary point-of-view camera. This works well in those instances because the player rarely needs to adjust between near and far objects. However, in VR titles, our player will need to switch focus between objects near and far. Attaching a sprite to the OVRCamerRig will cause double-vision as the player shifts focus between the reticle and the environment. This is known as voluntary diplopia and besides, being annoying, it causes headaches for some players. ...

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