Triggering parameter animation

Hi all, new here and to Nuke and to compositing generally in fact.

Absolutely loving Nuke so far, having only had a brief and traumatic experience with After Effects before. But I’m struggling to work out a few things and was wondering if anyone more experienced could give me a few tips.

Probably easiest if I explain what I’m trying to do:

I’m working on a mockup of a game for an android phone and I have an effect, constructed out of a few nodes, that I’m using for the user tapping the screen.

It works fine when I key each part of the effect manually for each user tap, but what I would like to be able to do is re-use this effect in an efficient fashion – eg group the nodes together, duplicate and move, and then just pipe in a trigger signal as it were which essentially triggers the playback of a predefined set of anims on the groups internal node parameters.

Is there any way to do this?

Thanks in advance for any help!

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Parent camera going nuts!

Hi,
I have a car that is all "grouped" together. That Group node is animated from point A to B. (the car)
I then am trying to "Parent" a Camera (that is sitting on the car), to the car itself. The camera follows the car great however, when I render it the image is Black (no picture) although there is an alpha channel of the shot, just no color pic. As soon as I "UnParent" the camera, it renders out OK.
If I parent it again, the screen goes blank again.
What gives??

has anyone had this problem?

Maya 2011
Thanks,
lou

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Multiple Read Nodes with same source: slowing down script

i´m not sure about a little thing i tested:
i loaded a read(sourceX.%04d.jpg) an duplicated it 20 times. so every read kept the same source file. i did some modifikations like transform, blur ASO (nothing specific) and merged one after the next. when watching the last node while playback, it was fast , but let´s say took 1 sec per frame.

i copied the complete setup. only difference was, that i just connected 1 read node to all the inputs.
this setup ran 3 times faster!??

i thought nuke was smart enough to recognize that 20 read nodes with exactly same settings and same path act like one of them!!
am i wrong with that, or what´s it all about?

and what does it mean when dealing with multipass EXR? better load only one exr-read in script and branch this one to all the pass-merge operations?

thanks in advance!!