[Sidefx-houdini-list] Offset channel expression

Georg Duemlein info at preset.de
Thu Jan 24 04:16:59 EST 2008


not sure what this does if $F > npoints().

I think this one will loop over the points:
chf("/obj/null1/xform1/tx", ($F + 4) % npoints(/obj/null1/xform1/))



Larry Giunta schrieb:
> Perfect.
> 
> Thanks Sean.
> 
> 
> On Jan 23, 2008, at 1:39 PM, Sean Lewkiw wrote:
> 
>> chf("/obj/null1/xform1/tx", $F + 4)
>>
>>
>> Larry Giunta wrote:
>>> Hey Peter,
>>>
>>> I'm trying to offset a bunch of referenced channels
>>>
>>> So, for example, in the TX of a translate sop named "xform2", I'd put
>>> ch("/obj/null1/xform1/tx")
>>>
>>> So I'd like to append something to that reference to offset it by x
>>> number of frames.
>>>
>>> Similar to if I wanted to shift the whole curve up in value by 4, I
>>> could
>>> ch("/obj/null1/xform1/tx") + 4
>>>
>>> But I want to shift the curve in time here.
>>>
>>> I hope that makes sense. But it probably is something very simple I'm
>>> missing.
>>>
>>> Thanks
>>>
>>>
>>>
>>>
>>> On Jan 23, 2008, at 12:56 PM, Peter Robbinson wrote:
>>>
>>>
>>>> Hi,
>>>>
>>>> Don't you just add or subtract your offset from $F?
>>>>
>>>> $F+n
>>>>
>>>> PeterR
>>>>
>>>> Larry Giunta wrote:
>>>>
>>>>> Is there a way I can shift or offset ( by  x number of frames ) a
>>>>> referenced channel in SOPs with some type of expression.
>>>>>
>>>>> I know I can do this with Chops. ( fetch, shift, export )
>>>>>
>>>>> However, I'm looking for a quicker way so I can simply copy and  
>>>>> paste
>>>>> an expression
>>>>> to various SOP and then retype one offset/shift value.
>>>>>
>>>>> Chops would be perfect, but due to the complexity of the SOP
>>>>> network ....... and for
>>>>> better speed while still experimenting ( adding and deleting SOPs
>>>>> often ),
>>>>> I'm hoping to avoid the step of importing and exporting channels to
>>>>> Chops if possible.
>>>>>
>>>>> Thanks is advance for any help.
>>>>>
>>>>> Larry
>>>>>
>>>>>
>>>> -- 
>>>> "gravity is not a force, it is a boundary layer"
>>>> "everything is coincident"
>>>> "Love: the state of suspended anticipation"
>>>> "To get any appreciable distance from the Earth in
>>>> a sensible amount of time, you must lie."
>>>> "Easy, is not how you make a living."
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>> -- 
>> Sean Lewkiw
>> --
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>>
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