Figure 6

Coding of surface attitude and predictions.

(a) Egocentric attitude is measured relative to the view vector. (b) This figure should be seen as a concave hemisphere, with pins pointing in the surface normal direction. (c) A maximum entropy world generates a distribution of observed surface attitudes that peaks at fronto-parallel. (d) For fixed tilt (e.g., dashed line in (c)), probability decreases with surface slant, following a cosine law, as shown by the foreshortening of the surface patches below and noted previously⁶⁷. (e) When collapsed across tilt, probability peaks at 45°. (f) Selecting a neighbourhood to estimate surface attitude.