isizeISIZE(nged)
NAME
isize - return the inverse of the current view size
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SYNOPSIS
DESCRIPTION
The isize command returns the reciprocal of the current view size in the current working units. This is a read-only getter — no arguments are accepted.
The inverse view size is related to the current zoom level. It equals 1 / view_size, where view_size is the value returned by the size command. A larger isize value corresponds to a more zoomed-in view (smaller view size); a smaller isize value corresponds to a more zoomed-out view.
This value is primarily useful in scripts that compute view-space to model-space scaling factors.
EXAMPLES
Example 1. Get the inverse view size
mged> isize
Returns the reciprocal of the current view size in working units, for example: 0.001 when the view size is 1000 mm.
Example 2. Use isize in a calculation
mged> set inv [isize] mged> set sz [size] mged> expr {$inv * $sz}
Retrieves both isize and size and verifies their product equals 1.0.
SEE ALSO
size(nged), zoom(nged)
AUTHOR
BRL-CAD Team
BUG REPORTS
Reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org