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Unexplained Options in UDK setup for an unprogrammed UDK

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Hi all,

As I found nothing about those options in the manual and forum, could someone please explain following options which can be set on an empty UDK:
- Knockout
- Clear Fixture

Thanks and regards,

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Hi kgallen,

Thanks for your response.

Hmmmm, I'm not 100% sure if I understood for what this is for...
When "Clear Fixture" removes just the fixture selection from the programmer, what do I do with the rest inside it?

I played a little bit with it on PhantomZerOS and found only one situation where this could help:

If you're programming fixtures during a playback and have entered e.g. "1 THRU 3" followed by ENTER and then "@ 75" and before applying the command with ENTER
you have to adjust the intensity of a fixture currently playing back, then you can deselect the "grabbed" fixture and continue programming.
(Commands in programmer turned to red letters when "playback fixture" is adjusted)

But this does not work when the programmer only contains "1 THRU 3" or "1 THRU 3 @" or "1 THRU 3 @ 75".

For me this is really confusing for what and when I can use this...

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Hi Edi,

Clear Fixture is a way of choosing which values in the programmer you want to clear, as opposed to tapping CLEAR that will clear everything in the programmer. This is therefore useful if you accidentally bring specific fixtures into the programmer, as you can select them (for example 1 THRU 6 ENTER) and tap the Clear Fixture UDK.

Knockout turns off currently selected fixtures that are coming from Playbacks. Therefore if you have a cue with fixture 1 on, and you select fixture 1 and tap your Knockout UDK, it will be taken to 0%. When you go into the next cue this fixture is used in it will output at its programmed level, and if you go back into the original cue you used Knockout in, again the fixture will come back on. This is therefore a temporary way of taking a fixture out of a cue, and different to the syntax 1 @., as it doesn't bring the fixture into the programmer. This is especially useful if a fixture has been accidentally knocked out of focus during a show, as you can select it and tap Knockout in the current cue, and allow for the problem to be fixed ready for the next time the fixture is used.

Hope that helps and makes sense, any queries let me know.


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