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[Bug?] Pixel components don't work w/Surface Height (Staff: By design)

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Indigo Ray
Adam

Posts: 1442
Filters: 82
See the attached filter. One would expect the pixel-derived gradient to behave the same as the profile gradient (at max size for a square image).

I'm pretty sure this is already known to the FF team, and that they just didn't implement this feature for the beta release. But better safe than sorry!

Bug_ Pixel-Based Height.ffxml
Posted: November 4, 2015 8:53 pm   Details E-Mail
Betis
The Blacksmith

Posts: 1207
Filters: 76
Oh weird. I wonder if it's because each pixel is a discrete value and not part of a "function" so technically it's a piece-wise function that has no "slope". It's possible this is intentional based on the nature of pixel-based calculations.
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Posted: November 5, 2015 1:40 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Yikes, and with a gaussian curve, even more so. Only a noticeable problem in Surface mode though.

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Posted: November 5, 2015 6:26 am   Details E-Mail
GMM
Moderator
Filter Forge, Inc
Posts: 3491
Quote
Indigo Ray wrote:
One would expect the pixel-derived gradient to behave the same as the profile gradient


Betis is correct: they are meant to behave differently. The profile gradient samples the function, while the pixel-based component returns the coordinate of a rendered pixel. The most obvious difference is in the top-left pixel: please take a color picker and measure it. The top-left pixel of the pixel-based gradient will always be black (0), while the top-left pixel of the profile gradient will never be black.
Posted: November 11, 2015 6:04 am   Details E-Mail

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