I wanted a callback that only triggers when user switch from one view to other.
but since i couldn’t find something like that,
I coded something like this ;
global before_av= viewport.activeViewport
fn viewport_swtich_trigger= (
curent_av=viewport.activeViewport
if before_av != curent_av then (
completeRedraw()
before_av=viewport.activeViewport
)
)
callbacks.addScript #viewportChange “viewport_swtich_trigger()” id:#ViweSwtcd
Since i wonder this will slow down the view ports,
is there a better way of doing this?
– (actually what im trying to do is clear a text generated on view port using gw commands; when i switch frm one view to another. )
i think you want something like this:
(
global GW_displayText
unregisterRedrawViewsCallback GW_displayText
fn GW_displayText =
(
wPos = 40 -- horizontal position max = gw.getWinSizeX() 0 is left
hPos = 40 -- vertical position max = gw.getWinSizeY() . 0 is lower left
gw.htext [wPos,hPos,0] "Potatoes" color:red
gw.updateScreen()
)
registerRedrawViewsCallback GW_displayText
global before_av= viewport.activeViewport
global viewport_switch_trigger
fn viewport_switch_trigger=
(
current_av=viewport.activeViewport
if before_av != current_av then
unregisterRedrawViewsCallback GW_displayText
else
registerRedrawViewsCallback GW_displayText
)
callbacks.addScript #viewportChange "viewport_switch_trigger()" id:#ViewSwtcd
)
Thanks a lot bro!
Will #viewportChange callback effect the viewport performance? (since its running everytime we make a change to the viewport?
You´re welcome.
Any callback has a cost. You must unregister a callback if you don´t need it more.
Look at the maxscript help.
callbacks.removeScripts [<callback_type_name>] [id:<name>]
This method is used to unregister and remove one or more callback scripts.
Specifying just a callback event type name removes all the callback scripts for that event type.
Specifying just an id: removes all callback scripts in all events with that ID.
Specifying both limits the ID-based removal to the specified event type.
if you need to change a viewport 100 times per second the callback will slow it a little
#viewportChange itself doesn’t effect. it happens only when a viewport changes (not for every redraw). for every change to viewport you use redraw callback.
the script that you call can. but it’s a different story.
Thanks a lot for the explanation bro!