Accessing first and last keyframes of a node.

[Symbolic]

Hi,

I am trying to query a node some where in my scene...

ex: "/obj/curve_pack/sblend1" with a channel "seqctrl"

I am trying to access the first kayframe and the last keyframe values in Frames for a specific channel.

I looked through the help...

I found the "chkeyls" command...

chkeyls /sblend1/seqctrl

and it lists: seqctrl 101 142

which are my first and last keyframes.

But how can I use this in an expression?

ex: automatically setting the input range and the output range of a TimeWrap node.

Thanks.

[rdg]

now tested:

arg(run("chkeyls /obj/null1/parm"), 1)

arg(run("chkeyls /obj/null1/parm"), 2)

chkeyls is a hscript command and needs run() to output something in an expression

Edited June 17, 2008 by rdg

[Symbolic]

Thanks Georg!

I really need to go deeper in hscript and python...

Cheers.

//

Ok, just tried it... works perfect! Thanks!

Edited June 18, 2008 by Symbolic

[Symbolic]

Hi!

Now I am in a new trouble.

The previous command works great with actual keyframes in a channel. You know when it is green (blue)

How can I access the first and the last keyframe of a channel that is overridden by a chop.

ex:

* I have two channels on a Null

1: sequence

2:processed_sequence

* channel (1) has an animation going from 1 to 10... just normal keyframes.

* I fetch this channel into chops... strech it and export it to channel (2), which is called in our case "processed_sequence"

So channel (1) is blue (green)

and channel (2) is orange.

I can access channel (1) with:

arg(run("chkeyls ./NULL/sequence"), 1)

arg(run("chkeyls ./NULL/sequence"), 2)

It gives me the results of 1 and 10

I am using these outputs inside a TimeWarp Node which is in the same network with my Null.

But how can I get the same data for channel (2)... which is linked to a chop network...

Thanks.

[rdg]

can't you just multiply by your streching factor?

I think there is something like $IC and $OC which gives you the first and last keyframes in chops.

You might need to extract them into constant channels and read them from there ...

[Symbolic]

Hey rdg,

Thanks man... but I think this one is getting too complicated... and I am really running out of time...

I think I will change my entire workflow and try to avoid the complex stuff for now...

Thanks anyway.

[Symbolic]

can't you just multiply by your streching factor?

I think there is something like $IC and $OC which gives you the first and last keyframes in chops.

You might need to extract them into constant channels and read them from there ...

The "arg(run("chkeyls ./NULL/sequence"), 1), arg(run("chkeyls ./NULL/sequence"), 2)" technique is very buggy...

It just do not evaluate properly.

Is there a better way of getting the frame data of the first and the last keyframes? How can I do that in CHOPs... I tried $IC and $OC in an expression CHOP but did not work...

What are the exact variables? (my help is not working )

Thanks.

[Symbolic]

Ok,

I have done it with the following CHOPs expressions:

ics(0)+1

ice(0)+1

This evaluates the first and the last key frame.