perspective property
Perspective of the cylindrical projection.
A number between 0 and 0.01 where 0 means looking at the cylinder from infinitely far with an infinitely small field of view and 1 means looking at the cylinder from infinitely close with an infinitely large field of view (which cannot be rendered).
Defaults to an arbitrary but aesthetically reasonable number of 0.003. A larger number brings the vanishing point closer and a smaller number pushes the vanishing point further.
Must not be null and must be positive.
Implementation
double get perspective => _perspective;
Implementation
set perspective(double value) {
assert(value != null);
assert(value > 0);
assert(
value <= 0.01,
perspectiveTooHighMessage,
);
if (value == _perspective)
return;
_perspective = value;
markNeedsPaint();
markNeedsSemanticsUpdate();
}