Hi Steve,
i believe that it's updating correctly since if i put a grade in the
input chain the image is calculated correctly. the concatenation is
happening further down the chain instead of before i'm able to
calculate the lens distortion. i just want to force an update of the
transform. it's seems related to this thread:
http://forums.thefoundry.co.uk/phpBB2/viewtopic.php?t=6596

i've been looking at a couple functions inside of
DD::Image::Transform, which i'm able to access via the inputs or
plugins getTransform() function but every time i attempt to call
updateConcat() or concat_input() if crashes on me.

thanks,
josh

On Mon, Mar 26, 2012 at 6:11 PM, Steven Booth <sbo...@legend3d.com> wrote:
> Sounds like a Hash value computation issue.  How about re-implementing the
> ‘append’ method and in it, append a unique hash value?  Simply appending an
> incremented integer value should do it.  This will cause your Iop to always
> be in a ‘changed’ state, and will force re-calculation every time.
>
>
>
> Steve
>
>
>
> From: nuke-dev-boun...@support.thefoundry.co.uk
> [mailto:nuke-dev-boun...@support.thefoundry.co.uk] On Behalf Of
> joshimbruglia
> Sent: Monday, March 26, 2012 9:59 AM
> To: nuke-dev@support.thefoundry.co.uk
> Subject: [Nuke-dev] break incoming concatenation
>
>
>
> hi everybody,
>
> i've written a lens distortion plugin and am having troubles with it
> maintaining concatenation of transforms. is there anyway to break
> this, force it to be calculated? not breaking the transform concatenation is
> causing incorrect output when
> using a tracker node or similar.
>
> in our previous gizmo we just placed a grade node above the input and
> this did the trick, i wrote the plugin as to not use a gizmo for
> efficiency reasons. right now all our artists who are using motion
> blur for example, are placing grade nodes above their lens distorts.
> i'm hoping for a more elegant solution.
>
> thanks!
> josh
>
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