Re: [LCtalk] Fwd: Clear Cue

[Fokko van Duin]

At 12:07 +0200 08-08-2007, P. Koelman wrote:
> 2007/8/8, Fokko van Duin:
> > With a go 0.0 you not only clears a layer (disable all channels), but 
> > also set it to the default settings. By calling the big zero scene, 
> > you also set the mixer channels all to zero, so you are sure all 
> > lights channels are zero.
>
> So there is no need 'activate' all 512 channels by setting them to zero!


It depends; let me explain in detail how each light channel (so 3072 
channels on a LCX) is processed every 50mS (a DMX packet):

Take the current mixer value, start scanning in reverse layer order 
the same channel in all layers.

If channel is active (black value) then process this value according 
the mixing mode rules. This means e.g. that with HTP the highest 
value of this layer value and last calculated mixer value. For copy 
mode the old mixer value is just replaced with the layer value.

So with processing the layers, the original mixer value is changed 
(not if the channel is inactive), and a new intermediate mixer value 
is created.

This is repeated until the last layer (the top one), and the new 
mixer value is written into the mixer.

It's clear that if you clear all layers, that the current mixer value 
will not change anymore; it's left as it was. If you load a cue with 
all zero channels in one layer, the mixer will also have all zeros, 
even if you clear (inactivate) that layer later.



Fokko van Duin,
CDS advanced technology bv,
http://www.lanbox.com/