Enhancing Size Perception with True-Size Viewing CAD plug-in and Cloud-enabled AR APP

Junjian Chen, Zhongyuan Liao, Y. Cai
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Abstract

Introduction: Compared with sketching or viewing the drawing on paper at the scale of 1:1, it is difficult to have an intuitive understanding of the part size when designing and viewing models in CAD software since the displayed size usually differs from its true size[2]. The reason for this is the inaccurate size perceiving process. Size perception refers to the complex cognitive behavior of interpreting the spatial geometry magnitude of objects[5][10]. A familiar object's perceived size remains identical regardless of the changing distance[8]. This phenomenon is known as size constancy[11], and it helps humans estimate the size of unfamiliar objects. However, the part in the CAD is usually of low familiarity and presented without any familiar object, so the size perception is based on the perceived target distance and the visual angle. When observing a virtual object shown on the monitor, the convergence of two eyeballs focusing on the same object plays the most important role among all cues[3][9]. 3D CAD software uses the 2D image of a virtual camera targeting the model located at a virtual distance to display 3D models. The viewer perceives the displayed size instead of the true size, while the perceived target distance is the distance between the viewer's eyes and the monitor. Even when the virtual model is placed in a virtual environment identical to the real scene, it is also perceived to be smaller than the real object, although the retinal size is the same[12]. The CAD Window will show all the Camera Range, and the ratio of CAD Window Size to the Displayed Size equals the one of Max Camera Range to True Size. Fig. 1 is listed below to illustrate the display method in the 3D CAD more clearly.
增强尺寸感知与真尺寸观看CAD插件和云启用AR应用程序
简介:在CAD软件中设计和查看模型时,与1:1的比例在纸上画草图或查看图纸相比,由于显示的尺寸通常与实际尺寸存在差异,因此很难直观地了解零件尺寸[2]。造成这种情况的原因是尺寸感知过程不准确。尺寸感知是对物体空间几何大小进行解释的复杂认知行为[5][10]。无论距离如何变化,熟悉物体的感知大小都是相同的[8]。这种现象被称为尺寸恒常性[11],它可以帮助人类估计不熟悉物体的大小。然而,CAD中的零件通常熟悉度较低,没有任何熟悉的物体呈现,因此尺寸感知是基于感知到的目标距离和视觉角度。在观察显示器上显示的虚拟物体时,两个眼球聚焦在同一物体上的收敛在所有线索中起着最重要的作用[3][9]。3D CAD软件利用位于虚拟距离的虚拟摄像机对准模型的二维图像来显示三维模型。观看者感知到的是显示尺寸而不是真实尺寸,而感知到的目标距离是观看者的眼睛与显示器之间的距离。即使将虚拟模型放置在与真实场景相同的虚拟环境中,尽管视网膜大小相同,但它也会被认为比真实物体小[12]。CAD窗口将显示所有的相机范围,并且CAD窗口大小与显示大小的比率等于最大相机范围与真实大小的比值。为了更清楚地说明其在3D CAD中的显示方法,下面列出图1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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