Shader as Blendmode does not?

When I did a blendmode (in the foreground and background image4 sources),
I noticed that no matter what coordinates I use the sampleNearest, the result on Pixel Bender differs from Flash.

for example
result = sampleNearest (background, outCoord () * 2.0);
Pixel Bender return a background 'resized', but the flash for a reason, I'm not

sampleNearest (background, outCoord () * 2.0); Returns the value of sampleNearest (background, outCoord());


or, another example

result = sampleNearest (background, float2 (0.0,0.0));
Pixel Bender returns a solid color of image (from pixel 0,0), but flash still once, nothing happens.

I did something wrong?

This confuses me so when I made my first mix of experiences in Flash mode. I had to ask Tinic finally because I saw the same behavior. The answer is that in Flash when using Pixel Bender as a blending mode, admission coordinated for the sample calls is always outCoord(), no matter what you specify. The reason for this is that if we do a convolution (pixels in different sampling inlet), we wouldn't be a mix, we would be a filter.

It's kinda an unsatisfactory answer, but if you think about it, it makes sense I hope.

Tags: Pixel Bender

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