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Thread: How To Make a Rotating Brush in GIMP

  1. #1
    Administrator RobA's Avatar
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    Tutorial How To Make a Rotating Brush in GIMP

    In this thread I showed a brush I made for GIMP that would rotate as you painted, god for stroking paths to lay down buildings.

    I have finally put together a script-fu that simplifies this process. I have tested it in GIMP 2.4, but not 2.2

    First download the attached ZIP and put the setup-brush.scm file into your GIMP script directory. This should be C:\Documents and Settings\<user>\.gimp-2.4\scripts

    Follow the following steps:
    Click image for larger version. 

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    Next Post shows how to make an alternating brush...

    -Rob A>
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    Last edited by RobA; 04-27-2010 at 03:38 PM. Reason: The typo was bothering me.

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    Administrator RobA's Avatar
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    You can also have two (or more) images alternate.

    Just make your source a multiple of a square, like 50x100 (for two) or 50x150 (for three). Each source image must be in a square, and only the image contained within the largest circle that fits that square will get rotated...

    Note that the cell size is that of each square, the number of cells is the total (2 x 12 rotations), and it has two dimensions. The first dimension has 2 cells and increments (these come from the columns). The second dimension has 12 cells and is angular (this is the rotated row of images).

    Refresh brushes and draw with it.

    Click image for larger version. 

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    (I toggled on "Use Color from Gradient" with a rainbow gradient selected in the paint tool dialog in the lower half.)
    -Rob A>
    Last edited by RobA; 04-27-2010 at 03:42 PM.

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    Community Leader pyrandon's Avatar
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    Very cool! Thanks!

    PS: What are trying to do to us PS users with cool GIMP features liek this, make us jump ship? I need to see if I can do this in PS...
    Don
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    Community Leader RPMiller's Avatar
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    Actually that would be "The" Gimp. Hopefully Rob doesn't own a leather hood...

    Bill Stickers is innocent! It isn't Bill's fault that he was hanging out in the wrong place.

    Please make an effort to tag all threads. This will greatly enhance the usability of the forums.


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    Administrator RobA's Avatar
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    Ouch. That hurts (figuratively)

    -Rob A>

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    Community Leader RPMiller's Avatar
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    I think we are approaching TMI.
    Bill Stickers is innocent! It isn't Bill's fault that he was hanging out in the wrong place.

    Please make an effort to tag all threads. This will greatly enhance the usability of the forums.


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    Guild Member Facebook Connected wisemoon's Avatar
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    Quick question...is there a way to use this script and/or technique to create an animated brush in Gimp that, instead of rotating the shapes, will just alternate between different sizes? For instance, I want to create a brush shaped like a tree trunk, that will alternate between different sizes and shapes. I'm not sure if I follow the steps for the rotating brush that it will turn out the way I want it to.

    wisemoon
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  9. #9
    Administrator RobA's Avatar
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    Quote Originally Posted by wisemoon View Post
    Quick question...is there a way to use this script and/or technique to create an animated brush in Gimp that, instead of rotating the shapes, will just alternate between different sizes? For instance, I want to create a brush shaped like a tree trunk, that will alternate between different sizes and shapes. I'm not sure if I follow the steps for the rotating brush that it will turn out the way I want it to.

    wisemoon
    That is even simpler, just create a brush with multiple layers and put a tree on each layer, then save it as a gih file, but specify only one dimention and make it "random"

    -Rob A>

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