Sjeiti
 |
Ok... I'm at the end of my latin here.
I'm trying to create a spiral thing like this: but I can't seem to get the bands evenly spaced. (btw.. is there no way to put multiple images in one post?)  |
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| Posted: January 20, 2008 9:54 am | ||||
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Sjeiti
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I've remapped this spherical thing with an x-times repeated Profile Gradient but as you can see here the bands at the corners are narrower than those further away.
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| Posted: January 20, 2008 9:54 am | ||||
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Sjeiti
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Remapping it with a slightly negative Gain almost doest the trick but not quite. My guess is (since I'm unable to explain this logically) I have to use a Wave but mirrored over a diagonal (so it will look like that Gain).
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| Posted: January 20, 2008 9:55 am | ||||
Sphinx.
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That happens because the angular gradient is not 100% angular - I noticed this some time ago because I had similar problems. I didn't find a solution back then, but perhaps I should give it another go.. I'll return if I find out something useful
 |
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| Posted: January 20, 2008 10:02 am | ||||
Kraellin
 |
no, there is no way to post multiple images in one post
no idea on your filter, though. maybe uber or voldemort will show up. If wishes were horses... there'd be a whole lot of horse crap to clean up!
Craig |
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| Posted: January 20, 2008 10:37 am | ||||
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Sjeiti
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Well, I submitted it anyway. The gain is good enough for now. I someone ever finds a fix I can always update.
Here's the first preset:  |
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| Posted: January 20, 2008 10:59 am | ||||
Crapadilla
 |
Yup. Although uberzev's snippet works fine for most cases, I still feel that a 100% correct (i.e. hard-coded) angular gradient is one of those components that should be introduced in the future. --- Crapadilla says: "Damn you, stupid redundant feature requests!" ;) |
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| Posted: January 20, 2008 11:48 am | ||||
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Kraellin
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cool
you might take a look at the various snippets or volde's filters. he's done some pretty wild things with stuff like this. If wishes were horses... there'd be a whole lot of horse crap to clean up!
Craig |
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| Posted: January 20, 2008 11:49 am | ||||
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Crapadilla
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| Posted: January 20, 2008 11:49 am | ||||
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Crapadilla
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If I understand your problem correctly, then Sphinx does have a solution to this in one of his filters ('Sonar Screen'). Check the even bands on this...  --- Crapadilla says: "Damn you, stupid redundant feature requests!" ;) |
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| Posted: January 20, 2008 11:59 am | ||||
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Sjeiti
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By god you're right... great...!!!
(But there's a frame in there: frame breaks scale. Maybe that's why Sphinx said he didn't find a solution.) |
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| Posted: January 20, 2008 12:27 pm | ||||
Mousewrites
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?? http://www.filterforge.com/forum/read...4&TID=4561 I put like 6 images into this post. Why can't you put multiple images in? |
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| Posted: January 20, 2008 5:33 pm | ||||
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Sjeiti
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Those are images on another domain. I'd rather upload them to ff. Otherwise one day they might just disappear.
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| Posted: January 21, 2008 3:58 am | ||||
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Sphinx.
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Yeah, that radar/sonar thing is not the right solution to the problem. The problem is in detail that the curvature of the four/eight parts that make up the angular gradient as a whole is incorrect (you can even spot seams btwn them in extreme range expansion cases). To make a truly correct angular gradient we need an arctan2 function or similar.
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| Posted: January 21, 2008 6:11 am | ||||
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Crapadilla
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Which apparently we don't have at the moment, so we might as well turn to 'sub-optimal' solutions...  --- Crapadilla says: "Damn you, stupid redundant feature requests!" ;) |
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| Posted: January 21, 2008 6:53 am | ||||
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Kraellin
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'post', not 'thread'. a post is a single entry within a thread. If wishes were horses... there'd be a whole lot of horse crap to clean up!
Craig |
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| Posted: January 21, 2008 2:16 pm | ||||
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Sjeiti
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She has as single entry with multiple images, but used the image button above, not the attach file field below. For the first you need to upload your images to a server of your own choice first, and the latter uploads one file to the filterforge server.
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| Posted: January 21, 2008 3:28 pm | ||||
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Mousewrites
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 |
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| Posted: January 21, 2008 9:53 pm | ||||
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Sphinx.
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Allright.. I think I'm onto something here, it seems to work as expected, i.e. diagonal beams should be wider than horizontal and vertical (because the distance is greater), and not the other way around. This version is also simpler and slightly faster than the "classic" one.
Tell me what you think, does it solve your problem? Angular Gradient.ffxml |
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| Posted: January 22, 2008 5:05 am | ||||
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Sjeiti
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Ah great, it looks perfect in the spiral filter... thanks for the help...
I doubt if the gain is completely accurate: it sometimes looks a bit octagonal in my test (I can't really tell with all that moire occurring ).
If I were you I'd post your solution as a snippet. Angular Gradient - test.ffxml |
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| Posted: January 22, 2008 5:53 am | ||||
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Sphinx.
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Right, its still not a "real" solution, but at least the octagonal is closer to a circle than a square/diamond . I did work on a more accurate version, but the number of curves and curve ops sucked all life out of it so I stopped working in that direction - Reasonable performance is really essential to wether its useful at all (correct or not). |
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| Posted: January 22, 2008 7:10 am | ||||
uberzev
 |
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| Posted: March 23, 2008 9:25 pm | ||||
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