Cloth wrinkles

ok, if i'm reading you right, you want something that will map out a height map and apply it to the same image?

or do you want two imported images, one a height map that is applied to the second? if that's the case, it cant currently be done. you can only use one imported image in this version. we're hoping that changes in version 2.xx.

let's go back to the first one. FF can output height maps based on the filter. you could use those. just import your image and spit it out as a bumpmap. not so elegant, perhaps. you could also import a regular image, desaturate it and put it as the height input on a surface filter.

let's take your button example. let's say you had a photo of a shirt with buttons down the front. and let's crop the whole thing so that your photo is now a closeup of just one button. now, you've still got the real world lighting on that photo. you open it in filter forge, and in the editor, you use an 'image' component. your photo will now show in that image component. plug in a 'desaturate' component and you now have a grayscale of your original in the thumbnail on the desaturate component. plug that into the height node of the results component (you'd have to change the results component to a surface type first) and you'd now have your height map based on that photo.

ok, i'm going to quit for the moment, since i may not even be describing what you want. lol. let me know.

Welcome to FF! Now let's see...

There's a component in FF called a refraction which bends an image based on a height input. In your case, you might want to take a smooth repeated mirrored profile gradient (maybe a noise gradient/perlin noise?) and plug that into the image input (this will be your wrinkles). Your black and white bumps (an image component) would get attached to the height input. The wrinkles would then bend to the bumps. Adjust the refraction slider accordingly. Then you overlay that onto your original grayscale image to get a bump map.

Fortunately, this snippet does that for you. Next time, I might be so easy on you.

I hope this all helped.



Wrinkles.ffxml

Britt/ Betis:

Interesting problem. I don't think there is any super easy built in way to make 'folds' from an arbitrary topology. Ie how to get the wrinkles to 'focus' in the corners. You can certainly do it if you know the general topology (all in the center, in 4 corners, etc) but to do it arbitrarily is the trick.

We've been talking on the forums about this sort of effect in the context of landforms and erosion. LINK

Betis: You might try using the 'Highpass at 100' trick, using a few intersecting perlin noises. Cracking and Branching
I think it might be possible to create some branching using that, and then distorting it around the height using threedee's super clever Get X, Get Y technique: Get X Get Y

let's see if this is at all close to what you want. now, this outputs transparencies, but that can be filled in if needed.

Bumpmapper 1.ffxml

I tried the XY and Cracks processes. Interesting but still not right. If I could get Cracks to orient properly it might work.

Britt

Am I right to assume that you want to input an UVmap with rough placed wrinkles?

Maybe something like this?
(based on Indigo Ray's filter)

Maybe this will help to understand where I am coming from. The image below shows a Photo of a foil wrapped piece of a spacecraft. I had to hand paint bump maps for the whole spacecraft, which is covered in foil. As you can see below I did a fair job of it, but it could be better, and I would love not to have to spend as much time at it. Thus the search for a better way to generate cloth bump maps that react to the actual attachment points, or at least react to height changes by lining up the wrinkle orientations.

Craig,

Yes, I have been paying attention to the Bump channel in the render maps, as I expect that is the one I am going to want for output. The use of the noise component in your filter is one I have tried (see Get X, Y Britt.ffxml above) But the wrinkle orientation issue is still not on that has been come to grips with.

Britt

I see the problem. The refraction component bends the source around white areas, but it doesn't bend the source towards the black areas. You need something like a pinch/bulge effect. Photoshop does that, but it only uses a single value for the whole image, not a grayscale map. Maybe this filter will help?

Here is the filter I used (edited) to make the above:

Bluge_pinchifyBritt.ffxml

Hi all, long time no see!

I might be a bit late on this, but I checked the forums today and this sounded like a good one to try and work out, so here's what I managed to put together.

Render:


Bump map:


TD

Welcome back TD. This is pretty nifty, almost looks like erosion! Is it possible to make the wrinkles more soft and plushy instead of small and crinkly? Also, have you tried your hand at the V2 Beta?

Hi Indigo -- thanks. Yes, I guess you could replace the current Stones noise in the filter with Cells noise and make them bigger. I gave V2 a whirl just after doing the above filter. Bomber rules!

Britt -- certainly. Here you go. It is not optimized for all uses, but the first two things to try are "Invert height map" and "Blend style." After that, it is into the guts of the filter, modifying the input image levels might do the trick.



Foil wrap.ffxml