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Distorting Layers to Create Map "Gores"
http://gimpchat.com/viewtopic.php?f=8&t=20247		 Page 1 of 1
Author:  MarantzBlue [ Fri Jan 13, 2023 4:02 pm ]
Post subject:  Distorting Layers to Create Map "Gores"
GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: Basic Level


I'm trying to distort a map and create gores kind of like in this video here.
What I have so far is to take the map and create guides by percentage and then "slice using guides". This gives me the pieces I then want to distort. What I have tried so far is...
1. Using a curve bend distort which creates a nice curve outwards but what I really want is to pinch the top and bottom in.
2. Using the perspective tool which can pull things in nicely but only does so with straight lines and distorts the image by pulling the image either up or down.

I haven't been able to figure this out so hopefully someone here will have an idea.

Attachments:
File comment: example of map to break into gores
Earth2.jpg
Earth2.jpg [ 1.63 MiB | Viewed 775 times ]
Author:  racer-x [ Fri Jan 13, 2023 4:54 pm ]
Post subject:  Re: Distorting Layers to Create Map "Gores"
The easy way. Earth Map Gore:

Image
Author:  rich2005 [ Sat Jan 14, 2023 5:01 am ]
Post subject:  Re: Distorting Layers to Create Map "Gores"
There is a web site about gore creation here: http://www.vendian.org/mncharity/dir3/planet_globes/

There might be something in there for Windows users For linux users there is a non-gimp perl script, although you make your original .ppm image with Gimp.

I have in the past hand-made gores using the gmic plugin. Very tedious but possible.

Attachment:
globe.jpg
globe.jpg [ 121.29 KiB | Viewed 717 times ]


FWIW, digging into my (old) projects folder, these are the resources I use, attached in the zip.
A svg template, import into the paths dialogue and scale it to fit the image.
A saved gmic Interactive Warp. This comes as a user 'fave gmic_qt_faves.json' Put it into your gmic user profile. (backup the old faves if required)

This is a hint, not a tutorial, apply gmic to each panel, use the path to select (invert selection) and cut the surplus background. https://i.imgur.com/M0OVMcw.mp4

Attachments:
for-gmic-gores.zip [1.23 KiB]
Downloaded 45 times
Author:  MarantzBlue [ Wed Jan 18, 2023 10:55 am ]
Post subject:  Re: Distorting Layers to Create Map "Gores"
Thank you rich2005 that is very helpful!
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