I am not 100% sure of what is going under the hood but if you look at the
documentation (expressions) you will see some interesting functions that kind
of showcase the different between; pretransformation, paramtransformation and
transformation…
My take (and this is just me been creative here) is that the numbers you see in
the Parameter box really are the object transformations BEFORE the CHOP
evaluation and further modification, and the suspicion comes in the sense that
the output node exports that data to the next node connected as this example
shows.
I have prepared a little example with five different methods, none is really as
easy as Softimage, granted, but you certainly can get hold of the data. These
approaches in some form can also being retrieved from other contexts (VOPs for
example) so it is not very convoluted sometimes.
Sorry of the scene is horrible and dirty but I hope at least provides a lead to
the method you prefer.
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.dropbox.com_s_pua7gql8622oo8t_constraints-5Fv001.hip.gz-3Fdl-3D0&d=DwIFaQ&c=76Q6Tcqc-t2x0ciWn7KFdCiqt6IQ7a_IF9uzNzd_2pA&r=GmX_32eCLYPFLJ529RohsPjjNVwo9P0jVMsrMw7PFsA&m=r6SX_jcfhKhTp5dNpXK4K98Ewb7jYAAFDsf7TWZCsyo&s=vH8ZbhIW4w-heVRpgRlNebMkssk0AYO_HCLtL8UJeGU&e=
PLEASE DOWNLOAD IT AS I WILL DELETE THE FILE AT SOME POINT.
Hope it helps
jb
PS. Be careful with the Fetch, I am not taking in consideration parenting and
what not...
> On 13 Nov 2017, at 06:35, Olivier Jeannel <[email protected]> wrote:
>
> Thank you Jonathan, I watched it. That was frightening.
>
>
> 2017-11-12 20:17 GMT+01:00 Anto Matkovic <[email protected]
> <mailto:[email protected]>>:
> Well if you're insisting, Houdini seems to follow Maya style pivoting, where
> pivot is just a position in parent space, so it can't be rotated. There are
> three parameters to control the pivot in Maya and H, not nine like in SI.
> Now, in Maya, if someone wants to override that behavior, usually it's enough
> to utilize some of always present outputs, like parent matrix or something
> directly related to pivot. Or, to constrain something else in same hierarchy,
> and connect the output of constraint node to anything else, too. Last is what
> I prefer (in Maya), anyway should be working in H with a few objects more, to
> let's say constrain another object under same hierarchy, then to use Object
> CHOP (this one is able to compare SRTs of two objects, if I'm correct) to
> get delta.
> Or, to constrain the parent.
>
>
> From: Olivier Jeannel <[email protected] <mailto:[email protected]>>
> To: Official Softimage Users Mailing List.
> https://urldefense.proofpoint.com/v2/url?u=https-3A__groups.google.com_forum_-23-21forum_xsi-5Flist&d=DwIFaQ&c=76Q6Tcqc-t2x0ciWn7KFdCiqt6IQ7a_IF9uzNzd_2pA&r=GmX_32eCLYPFLJ529RohsPjjNVwo9P0jVMsrMw7PFsA&m=r6SX_jcfhKhTp5dNpXK4K98Ewb7jYAAFDsf7TWZCsyo&s=O_eg_I_WZfxum0N8JRJK6SaWu2-jMaeEDz5VAt8t4eA&e=
>
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__groups.google.com_forum_-23-21forum_xsi-5Flist&d=DwMFaQ&c=76Q6Tcqc-t2x0ciWn7KFdCiqt6IQ7a_IF9uzNzd_2pA&r=GmX_32eCLYPFLJ529RohsPjjNVwo9P0jVMsrMw7PFsA&m=k4fUul_BZvHz4VIfnWuyzC2bBCT_erlUsyS3JGBvJ34&s=4LU1S71QmdsZBJS9rdSfjbFkN4dIvYcL0kXZ5-3vgKE&e=>
> <[email protected] <mailto:[email protected]>>
> Sent: Sunday, November 12, 2017 10:20 AM
> Subject: Re: H16 Constraint behavior
>
> Example yes please ! ;)
>
> For a "Look at", how do you set this up so that the rotation affects the
> pivot at obj level ?
>
>
>
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