Visualizable data (D<sub>in</sub>) are obtained that represent a scene (S) with at least one object (110, 120, 130). The visualizable data (D<sub>in</sub>) describe the scene (S) as seen from a position (P). First and second measures (L1; L2) are determined, which represent extensions of one of the objects (110) in a smallest and a largest dimension respectively. An object aspect ratio (R) is calculated that represents a relationship between the first and second measures (L1; L2). Based on the object aspect ratio (R), a selection margin (M) is assigned to the object (110). The selection margin designates a zone outside of the object (110) within which zone the object (110) is validly selectable for manipulation in addition to an area (A<sub>11</sub>) of the object (110) shown towards a view (V) thereof as seen from the position (P). Thus, it is made easier to manipulatable the visualizable data (D<sub>in</sub>) in response to user input, for instance in the form of gaze-based selection commands.
METHOD, COMPUTER PROGRAM PRODUCT AND PROCESSING CIRCUITRY FOR PRE-PROCESSING VISUALIZABLE DATA