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Scale Symmetry?

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xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Can't seem to find a way to fix this skewing towards the center in each of the 4 regions. How to get a perfectly symmetrical scaling of a 2 repeat spherical gradient?

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Posted: November 5, 2013 9:55 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Just using the Scale component and hookups to the Origin X/Y preferably, what is the proper method?

ScaleTest.ffxml
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Posted: November 5, 2013 9:58 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
The simple answer of course is to just use the .25 and .75 quadrant centers for the origins:

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Posted: November 10, 2013 9:39 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
filter

ScaleTest2.ffxml
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Posted: November 10, 2013 9:39 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
But to have the origins set by the initial image somehow, the closest I have found is a hybrid 50% normal blend:

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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 10, 2013 9:41 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
filter3

ScaleTest3.ffxml
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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 10, 2013 9:42 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
But it has to segment the image into quadrants in this case, which is not ideal. Any ideas on how to pinch a Perlin noise using the selfsame noise for example?
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Posted: November 10, 2013 9:50 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
The consequences of such trivialities:

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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 10, 2013 11:11 am   Details E-Mail
Indigo Ray
Adam

Posts: 1442
Filters: 82
Do you mean this? Take the simple case of flat image. You want the origin X&Y to just be gradients (in other words, nothing happens).

You take the X & Y derivatives of the input. These are the slopes. There is a factor to choose how strong the slopes are. You offset those gradients by the slopes. Those are the new origins.

Or something like that. smile;)
Try plugging in a perlin!

Self Scaling.ffxml
Posted: November 11, 2013 9:02 pm   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Oh, that's the one! smile8) It's too early or I'm too old to fully comprehend this, but awesome and simple solution!

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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 12, 2013 7:56 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
filter4

Self Scaling2.ffxml
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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 12, 2013 7:57 am   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
I think this is another faster lighting/shadow method too, combining it with Sphinx's Elevation - Angle - Slope.ffxml to "tame" or normalize the derivative. smile:)

<- Refreshes memory on The rate of the rate of change / acceleration / second derivative, zoom, Zoom, ZOOM! smile:D
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Posted: November 13, 2013 4:13 pm   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Using this method for both the scaling and for adding an additional light/color/shadow to a surface filter with 5 sample AA (edge only), in 30 sec we have:

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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 13, 2013 4:26 pm   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Too much fun! The same filter and AA settings, different controls, 42 sec:

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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 13, 2013 4:38 pm   Details E-Mail
Indigo Ray
Adam

Posts: 1442
Filters: 82
That's neat! You can also use this method to scale something by something else. I got this with the help of my vortex filter.
Posted: November 13, 2013 5:21 pm   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Totally, from where a million whirleds begin! smile;)

Speaking of your vortex filter, did you see the last post in your gallery? Specifically:

Quote
BTW, any further ideas on the spiral border?:
http://www.filterforge.com/forum/read...&TID=11150


Would love to save the stress of thinking that the border issue can be solved if it can't. smile:|
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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 13, 2013 6:22 pm   Details E-Mail
xirja
Idididoll Forcabbage

Posts: 1698
Filters: 8
Any good recipe books for cooking up exceptional erosional noise combinations? This is driving me batty, but from suffering comes reward they say.

So, winging it, another step in the right direction perhaps. Really liking the (+Perlin -Cells +Perlin) elevation gradient with this fractal self scaling gem. Any suggestions on rivers and rocks and such?

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http://web.archive.org/web/2021062908...rjadesign/
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Posted: November 15, 2013 11:55 am   Details E-Mail
David Roberson
Artist
Posts: 404
Filters: 36
I'm totally with you on the quest for erosion! I always read threads referencing the topic hoping to spot a breakthrough.

Nice textures, BTW. Share? smile:D
Posted: June 25, 2018 10:37 pm   Details E-Mail
David Roberson
Artist
Posts: 404
Filters: 36
Quote
xirja wrote:
Really liking the (+Perlin -Cells +Perlin) elevation gradient with this fractal self scaling gem.


Ooo. Neat! My brain popped a fuse trying to parse, "+Perlin -Cells +Perlin" bit in your comment, though... How does that part translate in a node-network?
Posted: August 17, 2018 9:24 pm   Details E-Mail
David Roberson
Artist
Posts: 404
Filters: 36
Quote
Indigo Ray wrote:
You can also use this method to scale something by something else.


That sounds like the very thing I've been trying to figure out! Would you care to elaborate? (I've got the filter(s), so I'll be playing with it to see what happens, however, I thought I should ask if there're additions required to do what you're referring to here, or if I'm likely to stumble on the answer myself just pushing and poking at it for a while...)

Thanks for the shares!
Posted: August 17, 2018 9:30 pm   Details E-Mail

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