[Bf-committers] development of conditional pass-thru node for compositor

[Xavier Thomas]

hi Pete,

I thought you might be interested in a fast and easy way to do this
with blender nodes:
http://www.pasteall.org/pic/11274

2011/4/20 pete larabell <xgl.asyliax at gmail.com>:
> indeed, certainly not saying it has to go into blender :)
>
> Just wanted an easy and fast way to get overlapping parts of alphas
> and such for an experiment. thought someone could find it interesting.
> Perhaps I'm not familiar enough with the other nodes, but i didn't see
> a really simple way to do all the tests i wanted to be able to do.
>
> On Wed, Apr 20, 2011 at 1:29 PM, Xavier Thomas
> <xavier.thomas.1980 at gmail.com> wrote:
>> Hi Pete,
>>
>> In fact the math node (in the convertor category) does something similar.
>> It does not have the "pass if true" and "pass if false" socket but
>> it's output can be used as mask to achieve the same result.
>>
>> I personally think your node is redundant, maybe more effective in
>> terms of performances but also less flexible.
>>
>> It is a pity that we cannot do nodes plugins in C so that one can
>> distribute some specialized node, because bloating the sets of
>> defaults nodes (provided with Blender by default) is not really an
>> option too, it will confuse user too much.
>>
>> Xavier
>>
>> 2011/4/20 pete larabell <xgl.asyliax at gmail.com>:
>>> not quite sure where this will end up, but it's working in it's
>>> current form, thought i'd share a quick render
>>>
>>> http://www.pasteall.org/pic/11269
>>>
>>> basic idea is:
>>>
>>> if(op1.pixel **TEST_HERE** op2.pixel){
>>>    out.pixel = pass_if_true.pixel;    //the 3rd input
>>> }else{
>>>    out.pixel = pass_if_false.pixel;   // the 4th input
>>> }
>>>
>>> obviously that's pseudo-code. :)
>>>
>>> current tests available are ==, !=, >, <, >=, <=
>>>
>>> plan to allow full RGBA sockets for at least the bottom 2 inputs and
>>> output socket.
>>>
>>> Cheers!
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