Lost Adventurer, Aleks Kirilenko (3D)
LC #42 Pipers Alley

View Full Version : randomly select children?

09-29-2005, 01:43 PM
Is there a function, plugin, coffee expression or xpreso setup in existance that will randlmly select a percentage of children in a heirarchy? Something I need immediately for a project I'm wrapping up.


09-29-2005, 07:02 PM
Here's a simple 9.5 script :)

// Get the active object
var op = doc->GetActiveObject();
if(!op) return;

// De-select all objects first

// Percentage 0.0 = 0%, 1.0 is 100%
var perc = 0.5;

// Get te first child object of active object
var child = op->GetDown();

// Start random generator
var r = new(Random);
var n;

// Count the children
// Generate a number between 0.0 and 1.0
n = r->Get01();

// Is this number less than our percentage?
if(n < perc)
// Select object
// Update object

// Move onto next object
child = child->GetNext();


// Update document

Just add it to the Script Manager, select a parent object and execute the script the usual method.

09-29-2005, 07:13 PM
if you're using 9.5 you can whip up a little coffee expression in no time

it should be something like:

//recursive select routine
Rselect(op,rnd) {
//randomly select (make active or not)
if (rnd->Get11()>0.0) op->SetBit(BIT_AOBJ);
else op->DelBit(BIT_AOBJ);

//recurse through hierarchy
var nchild=op;
for (nchild=nchild->GetDown();nchild;nchild=nchild->GetNext()) Rselect(nchild,rnd);

//main function routine
main(doc,op) {
var child=op->GetDown();
var random_seed=123456;
var rnd=new(Random);
//init random number generator with seed

for (child=op->GetDown();child;child=child->GetNext()) Rselect(child,rnd);

return TRUE;

oops, geespot beat me to it :D

anyhow, this can work as a coffee tag too in theory (though it may slow down everything to hell)

09-29-2005, 08:29 PM
Thanks guys.

I figured it would be a 9.5 coffee thing.

(copy -paste, copy paste) :)

I'm in 9.1 at the moment--but once I install I see this shouldnt be a problem. And also thanks to the guys who PM'd me as well.

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09-29-2005, 08:29 PM
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