Need some help with a 'Do nothing' expression

[Steve Cullum]

I'm using an expression in my node net work to drive some object copies based on the rotation value of a tube. What I want is the copy SOP to add 1 to the number of copies every 60 degrees. So at 60 its 1 at 120 its 2 at 180 its 3 etc...

Here is what I got:

if(ch("../xform1/rz") % 60,0,++1)

But this resets my channel to 0 if rz is not divisible by 60, so the result is always 1. How do I say 'Do nothing' as opposed to 'Do Zero' in my expression?

[SpencerL]

I'm using an expression in my node net work to drive some object copies based on the rotation value of a tube. What I want is the copy SOP to add 1 to the number of copies every 60 degrees. So at 60 its 1 at 120 its 2 at 180 its 3 etc...

Here is what I got:

if(ch("../xform1/rz") % 60,0,++1)

But this resets my channel to 0 if rz is not divisible by 60, so the result is always 1. How do I say 'Do nothing' as opposed to 'Do Zero' in my expression?

Will this work? The trun() expression converts your number to an integer rounding down.

trunc(ch("../xform1/rz")/60)

[Steve Cullum]

Will this work? The trun() expression converts your number to an integer rounding down.

trunc(ch("../xform1/rz")/60)

Thanks! that's got it.

[antoinedurr]

Thanks! that's got it.

Might want to use floor() instead of trunc() -- trunc() truncates, removing the portion to the right of the decimal point, whereas floor() uses the largest integer that is less than or equal to the floating point value. Using trunc() instead of floor() will hiccup between 0 and -60 (resulting in the same answer (0) as 0 to +60 when what you probably want is -1).

-- Antoine