Filter Forge - Is there (or will be) a way to do frac() or int()?

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Zoltan Erdokovy

Posts: 204
Filters: 24

Is it possible to get either the fraction of a HDR pixel or its integer part?

Posted: November 2, 2009 11:25 am

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Vladimir Golovin
Administrator

Posts: 3446
Filters: 55

Not yet.

Posted: November 3, 2009 6:09 am

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uberzev

not lyftzev

Posts: 1890
Filters: 36

Sorry to Hijack the thread, but I still don't quite understand the benefit of all this HDR goodness.

I understand it's theoretically better but can someone demonstrate a filter that would not be possible without HDR colors?

Posted: November 4, 2009 1:23 am

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tigerAspect

Posts: 222
Filters: 9

Yes, I'm really wondering about this too. The few things I've tried with HDR seem to be entirely able to be replicated with the right blend modes or maybe a Tone Curve.

Posted: November 4, 2009 8:09 am

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Zoltan Erdokovy

Posts: 204
Filters: 24

There is much bigger room to work in, before we encounter data clipping. In other words whatever you do, you wont lose data. I hope the attached filter shows what I mean.

LDRvsHDR.ffxml

Posted: November 4, 2009 12:57 pm

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Zoltan Erdokovy

Posts: 204
Filters: 24

There are a few less artistic tricks as well, using HDR capability.
Like the reason why I asked about the frac() function: with that, you could "encode" several LDR images in one HDR image, do operations on it, then recover the processed LDR data. It can save you a lot of trouble when otherwise you'd have the same node chain 2-3-4 times just because the data sets driving them are different.

Posted: November 4, 2009 1:29 pm

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Zoltan Erdokovy

Posts: 204
Filters: 24

Any news on the topic? I would use a map script node but I need tiling.

EDIT: Oh, I can force seamless tiling to be on. Cool!

Posted: August 18, 2015 4:43 am

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Sphinx.

Filter Optimizer

Posts: 1750
Filters: 39

Take a look at the Ceil and Floor components in the math category...

Njyldgarkn init/prepare process x no. of render blocks x no. of passes

Posted: August 18, 2015 6:26 am

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Zoltan Erdokovy

Posts: 204
Filters: 24

Yes, x-floor(x) is fine for frac() in simple node networks. However in complex ones a dedicated node would increase readability. I could use all the crutches I can get. smile:)

Posted: August 18, 2015 10:58 am

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SpaceRay

SpaceRay

Posts: 12302
Filters: 35

Quote
Zoltan Erdokovy Any news on the topic?

Sorry, is very funny that you are asking if there is new news 6 YEARS AFTER the last post!, smile:D

Have you been waiting all this time to be able to do this?

Posted: August 19, 2015 4:28 pm

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Zoltan Erdokovy

Posts: 204
Filters: 24

Nah, I just ran into this again: needing frac, looking for it, being sure that we had it, remembering that oh no I used it in Unreal not FF and then finally recalling that I made a thread about it.
But damn, I should have waited until noon, November 2... smile:)

Posted: August 20, 2015 2:39 am

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SpaceRay

SpaceRay

Posts: 12302
Filters: 35

Quote
But damn, I should have waited until noon, November 2...

NO you should not have waited to November so it was six years, sorry if this could make you think that I am going against you, and is not this in any way, only that is funny for me that you wanted and asked something nearly 6 years ago, and then now come back and ask the same smile;)