Spatial Cues in 3D Visualization - Ambient Intelligence for Scientific Discovery - page 117

Fig. 8. This is an example of an initial positioning task trial with no shadow in a
room with a flat background surface of solid texture. The task was to reposition the
misplaced sphere so as to create a straight line vector segment with one sphere located
exactly at the midpoint of the straight line segment.
Fig. 9. This is an example of an initial resizing task trial with one shadow in a room
with a flat background surface of solid texture. The task was to resize the smaller
sphere so as to match the size of the other larger sphere displaced in depth.
were resident within this 'virtual room.' It was similar to the second experiment,
but differed in several respects: (1) it utilized different positioning and resizing
tasks; (2) subjects could rotate (i.e. move) their view of each virtual room 45
degrees in either the left or right directions; (3) the target and referent objects
were always displaced at different distances, or depths (i.e. the z dimension),