Can you trigger an opscript...

[meshsmooth]

I would like to trigger a simple OPscrip when a parameter passes a set value.

I have a null that has its x translation between 0 and 1 used to blend between kinematic solutions and I want to trigger an OPscript to set some values when the null moved past the x value of 2. I can see some issues when the null is past 2 that is may be constantly triggering the OPscript, so i may need a trigger that only works once each time it passes 2.

[Jason]

I would like to trigger a simple OPscrip when a parameter passes a set value.

I have a null that has its x translation between 0 and 1 used to blend between kinematic solutions and I want to trigger an OPscript to set some values when the null moved past the x value of 2. I can see some issues when the null is past 2 that is may be constantly triggering the OPscript, so i may need a trigger that only works once each time it passes 2.

15105[/snapback]

Yip you can - look into the Logic CHOP.

[malexander]

You can use a Math CHOP to subtract 'X' from the channel, and then pipe that into a Logic CHOP. The logic CHOP converts the channels to binary (0/1, on/off), and by default anything greater than zero is a '1', otherwise it's '0'. So by subtracting X from the channel, you're essentially programming in the v > X expression.

A logic CHOP has 4 script parms for different conditions:

- when a 0-1 transistion occurs (off->on)

- when a 1-0 transistion occurs (on->off)

- when 1 (on)

- when 0 (off)

It sounds like you'll want to use 'Off to on'.

Incidently, in order for the script to be executed, the logic CHOP must be cooked - so you'll need to setup a dummy chopf() expression in another op which does cook to get logic to cook.

[michael]

...just wondering...

why are you blending kinematic solutions with the translation of a null?....I can't seem to think of a reason that this would be a good idea...

[meshsmooth]

When I started playing with this i had the issue that I was sampling the whole time line so when I made any changes it would trigger the script if I had it triggering at any time in the time line, so now I am going to switch the fetch to only grab the current frame. as for using a null to fiddle with kinematic solutions, well I want a handle in the view port that is handy. and i want to overload its functionality by having it behave as a button as well. it is to be done as a movement of the null that isn't key framed, just a movement that is deliberate with the available handles.

[michael]

ah...

I wish we could publish the rigging tools we built here to the codex and SESI Exchange (hmmm maybe I'll ask) - they're really simple but have lots of bells and whistles...sliders and other do-dads...

[edward]

While you can do it, I can't recommend this approach. I think a better way is to just use if(ch("/obj/mynull/tx")>=2, some_value, some_other_value) expressions.

[meshsmooth]

I have it worked out now. The logic chop with a one line opparm script. The reason for the script is I want it to be like a button click. It is meant to be a trigger. It worked out well.