Stereoscopic, head-tracked display systems can show users realistic, world-locked virtual objects and environments. However, discrepancies between the rendering pipeline and physical viewing conditions can lead to perceived instability in the rendered content resulting in reduced immersion and, potentially, visually-induced motion sickness. Precise requirements to achieve perceptually stable world-locked rendering (WLR) are unknown due to the challenge of constructing a wide field of view, distortion-free display with highly accurate head and eye tracking. We present a system capable of rendering virtual objects over real-world references without perceivable drift under such constraints. This platform is used to study acceptable errors in render camera position for WLR in augmented and virtual reality scenarios, where we find an order of magnitude difference in perceptual sensitivity. We conclude with an analytic model which examines changes to apparent depth and visual direction in response to camera displacement errors.

翻译：立体、头部追踪的显示系统可以向用户展示逼真的、世界锁定的虚拟对象和环境。然而，渲染管线与物理观看条件之间的差异可能导致渲染内容的感知不稳定，从而降低沉浸感并可能引发视觉诱发的晕动症。由于构建具有高精度头部和眼部追踪的宽视场、无畸变显示器面临挑战，实现感知稳定的世界锁定渲染（WLR）的精确需求尚不明确。我们提出了一种系统，能够在上述约束条件下，将虚拟对象渲染到真实世界参考之上而无需感知漂移。该平台用于研究增强现实和虚拟现实场景中WLR的渲染摄像机位置可接受误差，发现感知灵敏度存在一个数量级的差异。最后，我们提出一个分析模型，该模型考察了因摄像机位移误差引起的表观深度和视觉方向变化。