Howard I P
Perception. 1983;12(1):85-6. doi: 10.1068/p120085.
Certain undulating surfaces have an ambiguous relief which may appear as convex or concave. The direction of relief is generally held to depend primarily on assumptions about the direction of illumination. It is suggested that this does not apply to pictures with relief features with occluding edges.
某些起伏的表面具有模糊的浮雕效果,可能看起来是凸起的或凹陷的。浮雕的方向通常被认为主要取决于关于光照方向的假设。有人认为,这不适用于具有遮挡边缘的浮雕特征的图片。