Follow Path With Perspective Brush for GIMP

[trandoductin]

Requested by Rod,
To base the brush size on Y-coordinate (to create fake 3D perspective effect).




Click here for download --> Follow Path with Perspective Brush for GIMP

[trandoductin]

version 2 is up.
Fixed a Track Direction (angle) bug.

[trandoductin]

version 3 is up.
Added forgotten progress bar updates for friendliness.

and here's a sample run of paths where i drew rows of trees.

[trandoductin]

Version 4 is up.
Draws smaller brushes first because smaller brushes in the foreground would look weird in front of nearer (larger) brushes.

Version 5 is up. Forgot stupid progress bar update again.

[Rashid]

Hi
I am sorry to say that after using different settings I am unable to get change in size in terms of perspective. Perhaps I am unable to find suitable combination of settings. I get straight line of repititive objects without diminishing size.
Bye

[trandoductin]

are you drawing a line from top to bottom? size changes based on y-coordinate.
If you draw a straight horizontal line there would be no changes in size.

[Rashid]

I have tried two versions but I get the same result. First tried 5th and then removed and installed 3rd version. I am attaching screenshots of the process.

[trandoductin]

what is your brush?
it looks small on image 2 but how does it even fill the whole image in 3 it looks like.
It should only brush along the path.

[Rashid]

I have changed the brush but no perspective change.

[trandoductin]

I don't know what's the problem could be.
You're using GIMP 2.8 right?

I remember long time ago I wrote a script in scheme (I think it was the Green Apple Script), where i tried setting the context's brush attributes such as size and it didn't seem to do anything, i had to create a new brush myself in order for script to work.

But i am using 2.8 now and setting the context's set brush size works fine now.
So i am wondering if you might be using an older GIMP.
Other than that possibility I don't know why is isn't working for you.

[Rod]

Thank you Tran. I made a gear following a gear path. Nice filter.

[Rod]

And one with smaller brush settings. The last one was 30 min and 40 max
This one has the settings below.





Very Cool!

[MareroQ]

Again, I want it in my simple shape plugin...

[Rod]

Again, I want it in my simple shape plugin...

That is a great example of this filters potential MareroQ!

[Rashid]

Does it look-like your tree-plantaion image?

Created a new Brush Dynamic with Size Variation(Size-->Pressure & Fade checked).

[trandoductin]

yes it does look like it, nice work.
But are you using GIMP 2.8 or older GIMP?


EDIT: for a second there i thought the script worked for you, but after looking at it carefully i notice the size variation only seem to happen at the top, it doesn't gradually happen throughout the whole y-coordinate space like the fake 3D effect.

[Rashid]

I am using Gimp 2.8.10. The point of concern is the result of the result of the script which is against expectation.

[trandoductin]

I am using 2.8.16.
It's a concern but if it's an older bug in 2.8.10, I don't want to have create my own brush when the active brush is supposed to work fine.

Found something related to this: https://www.bountysource.com/issues/137 ... ont-t-work.

[Rashid]

My discipline has been 'Plant Sciences (Botany)'. Computer programs are horrible things to me. I visited the site but couldn't understand the importance of the code for console. Apologies.

[Rod]

You can actually do that with "WHEEL" and "FADE" in the brush dynamics editor (if you have the wheel in your mouse set to size increase or decrease), . BUT it will only make a small brush and then the rest larger but the same size. Your script is a whole lot different Tran.