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From Ben Smeets <...@okapion.com>
Subject Re: Limit Blendmode to 1 layer
Date Tue, 27 Aug 2013 07:29:38 GMT
Tnx Maurice, 

Will try to come up with something working using your tips. If I do, I'll let you know.

@Alex: I tried the Pbj shader as well, but it completely kills performance :( (as in, macbook
lifting off into space with it's fan).


On 27 aug. 2013, at 09:15, Maurice Amsellem <maurice.amsellem@systar.com> wrote:

> Option 1) is not such complex math. You can use globalTolLocal and localToGlobal to help
for conversions.
> Option2) you can get both red and alpha, because the hole only acts as a mask, and it´s
the overlay rect that has the red fill with alpha.
> I am in vacation, without my pc, so i can't send you any code that i have tested until
next week...
> Regards
> Maurice
> ________________________________________
> De : Ben Smeets [ben@okapion.com]
> Envoyé : lundi 26 août 2013 23:08
> À : users@flex.apache.org
> Objet : Re: Limit Blendmode to 1 layer
> Tnx Maurice,
> Option 1 is something I thought about. Doable, but complex math. It's what triggered
me to find help for a different approach though.
> Option 2 is the road I'm at now. I have the hole. The challenge is, that I would like
the parts outside the "shape layer" to be red instead of alpha. So masking (not sure) is not
something that'll work. That's how I got to the blendmodes. E.g. making the layer on top (with
the hole inside) red and blended. The only thing I'm still left with, is that that top layer
will also colorize everything below the image (the thing I only need to be colorized).
> Either way what we come up with, It already helpes knowing that my current approach is
not entirely crazy, tnx :)
> Ben
> On 26 aug. 2013, at 22:03, Maurice Amsellem <maurice.amsellem@systar.com> wrote:
>> Ok, i think i understood: the part of the dragged image that gets off the square
dragging area needs to be colorized.
>> Assuming my understanding is correct, I would do it either of two ways:
>> 1) programmatic
>> While the image is dragged around, determine the area that is off bounds and draw
a semi-transparent rectangle ( in updateDisplayList) in. That area
>> 2) mxml
>> Add an overlay rect the size and position of the dragged image, with alpha fill (
put them in the same s:group)
>> Create an area that corresponds to the off-bounds area, ie the background rectangle
with a hole corresponding to the square white rectangle, and use it as a mask ( mask property)
to the overlay rectangle.  That way , the overlay rectangle will be drawn only where the mask
is ON.
>> However, perfromance may be impacted when using large masks, so i definitely prefer
the programmatic way.
>> Hope this helps
>> Maurice
>> ________________________________________
>> De : Ben Smeets [ben@okapion.com]
>> Envoyé : lundi 26 août 2013 20:30
>> À : users@flex.apache.org
>> Objet : Re: Limit Blendmode to 1 layer
>> Sure, I'll try to explain it :) This is what I currently have:
>> - Top layer (blendMode=x)
>> - Draggable object layer (image)
>> - Shape layer (square white rectangle)
>> - Background layer (plain gray)
>> The Top layer is draggable. The goal is to make every part of Draggable layer which
is dragged outside of the shape layer below it, colorized (or something visual, while retaining
a bit of the visual aspect, which is why I got to overlaying a blended layer.). Most issues
have been tackled. Only thing left now is that by applying a blendMode, the gray background
get's part of that blend effect (color) as well. So I through the trick would be to limit
the blendmode to only the Dragable Object Layer.
>> Don't mean to spam the list, if this is not exactly Flex related. Any tips appreciated.
>> Ben
>> On 26 aug. 2013, at 19:29, Maurice Amsellem <maurice.amsellem@systar.com> wrote:
>>> For me, colorTrasform applies to the whole layer,  no masking is possible.
>>> Maybe if you can describe in more detail what you are trying to do, someeone
can help...
>>> Maurice
>>> ________________________________________
>>> De : Ben Smeets [ben@okapion.com]
>>> Envoyé : lundi 26 août 2013 19:23
>>> À : users@flex.apache.org
>>> Objet : Re: Limit Blendmode to 1 layer
>>> Didn't think of that one, nice. Extra challenge though, is that i can't transform
the entire layer. Just the part that the top layer is over (or is that possible with colortransform
as well)?
>>> Op 26 aug. 2013 om 17:35 heeft Maurice Amsellem <maurice.amsellem@systar.com>
het volgende geschreven:
>>>> If the purpose of the blending layer is to apply an coloring / lighting effect
to the layer below, they applying a color transform to the layer below instead (colorTransform
property) could be what you need.
>>>> Maurice
>>>> ________________________________________
>>>> De : Ben Smeets [ben@okapion.com]
>>>> Envoyé : lundi 26 août 2013 15:58
>>>> À : users@flex.apache.org
>>>> Objet : Limit Blendmode to 1 layer
>>>> Hi,
>>>> Anybody know if it is possible to limit the effect of a Blended layer to
only the layer below it (e.g.). My app has a dark background, the top layer which is blending
is now blending over all layers, including the background. I am trying to let it blend over
1 specific layer below it without affecting anything else.
>>>> Tnx, Ben

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