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GIMP/GL QuestionsBrush Follow Direction/Angle of Path? (Showcase | Slideshow)

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Wallace

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Brush Follow Direction/Angle of Path?

Post#1 by Wallace » 16 Oct 2016, 21:13


I'm making a diagram of a bicycle chain.
Showing how to install the chain onto a 12 speed bike.

I made this image to use as my chain link brush.
Bike_Chain_Link.png
Bike_Chain_Link.png # (11.16 KiB) Viewed 1577 times (Watermarked | Thumbnail)
I need to make the brush follow the direction and angle of a very winding path.

I made this image by changing the angle of the brush, as I painted.
This was very time consuming to do.
chain diagram.png
chain diagram.png # (145.33 KiB) Viewed 1577 times (Watermarked | Thumbnail)
Bike_Chain_Link.zip #
Bike_Chain_Link_Brush
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Pat625
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Post#2 by Pat625 » 16 Oct 2016, 21:51


Wallace, Did you make a path and stroke using your brush? I know that you do that a lot, taught me to do that!
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Post#3 by Wallace » 16 Oct 2016, 22:03


Pat625 wrote:Wallace, Did you make a path and stroke using your brush? I know that you do that a lot, taught me to do that!
Here is an example of using the chain link brush,to stroke the path.
chani_link_stroke_example.png
Example Image
chani_link_stroke_example.png # (81.63 KiB) Viewed 1573 times (Watermarked | Thumbnail)
As you can see the brush doesn't change angle to the path.

I know there is a way, (I can't recall) to make the brush follow the path direction and angle. To make the brush look like a bicycle chain.
As in my previously posted hand painted image, where I manually changed the angel of the brush for nearly every link.
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Post#4 by trandoductin » 16 Oct 2016, 22:43


chain_links.png
chain_links.png # (70.36 KiB) Viewed 1560 times (Watermarked | Thumbnail)
I just played around and this is what i did.
1. Used your chain link image, exported as .gbr. Restart GIMP to load it up in brushes.
2. Select that brush.
3. In Tool options, where it says Dynamics. clicked on blue arrow in front of that "Dynamics" and selected "Track Direction"
4. Opened the Brush Selection Dialog, and changed Spacing to about 90 percent (I don't know if this is best or not but 100 seemed to have empty spaces in between the stroke chain links.
5. Draw a path, Stroke path with paint tool with "Emulate Brush Dynamics" ticked on.

I hope that's what you want.

Cool gears by the way, and i think the chains should be a little bigger so that each gear looks like it's going into the groove of the chain, right?

EDIT: actually i just redid it with bigger links and 100 Spacing doesn't look too bad.
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Post#5 by Wallace » 16 Oct 2016, 23:34


This is the best I could do.
Using brush "Dynamics Track Direction", with spacing at 52.
Which is what I set the brush spacing to be by default.
The chain is off in some spots, which may have something to do with the path and or the brush spacing, not sure.
chain diagram 1.png
Chain Installation Diagram
chain diagram 1.png # (130.34 KiB) Viewed 1558 times (Watermarked | Thumbnail)
It could be better, but I'm satisfied with how this looks.

At first, I actually tried the Track Direction Brush Dynamics and was not happy with the results.

Thanks T.
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Post#6 by trandoductin » 16 Oct 2016, 23:35


That's looking very convincing to me :D
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Wallace

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Post#7 by Wallace » 17 Oct 2016, 00:01


trandoductin wrote:That's looking very convincing to me :D
I agree.
Nonetheless one can still see the spots where the chain is not continuous, or is off.

I scaled the brush by 1 pixel width and this it the result.
chain diagram new.png
chain diagram new.png # (131.75 KiB) Viewed 1553 times (Watermarked | Thumbnail)
Loos much better now, don't you agree?
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