AH, I know again, haha... looks like I never did forget after all!
The way image brushes [0] works:
First you need put some paint on the canvas with any other brush, because you need to capture brush images.
Both color and material amount matter, as they all get captured and then used. Whereby you can later turn on/off the use of the captured images' colors or only the material amount.
Once you have some paint you wish to capture, press [i] to bring up the capture rectangle. You can then move, resize and even deform this rectangle over what you wish to capture.
Press [i] again to finish. You then can change the paint, if you wish to, and do the same again ( [i] to bring up the rectangle and [i] to finish again ). You can do that as many times as you wish to, creating a sequence of images.
Once you're done you can turn on brush #10 [0] and it will paint, using the first image.
In the tiny GUI in the upper left corner you can then set some of the behavior. For example, the lower row of buttons, starting with [COL] is followed by the animation parameter toggle button [ =? ]. You can click on it to toggle through various animation behaviors.
[ =? ] Every stroke gets one random image out of your sequence
[ = ] only uses the image you have selected (You can click on any of the images to choose it, by the way)
[ >> ] animates through the entire sequence while your painting with every stipple advancing to the next image. Speed depends on the brush setting's stipple density, which is in the brush GUI on the right the dial called "BRISTLES". Turn it to 100% for maximum speed/stipple density.
[ pr ] your pen pressure will choose which image of the sequence is chosen, frome 0 pressure being the first image to 100% pressure the last.
[ >? ] every stipple will get a random image out of your sequence.
That's all of those behaviors for now.
[ COL ] the color toggle turns on/off the use of color or just the material amount.
OH, the empty button after the animation behavior is IMPORTANT! Turn it on, and use AVERAGE [Shift]+[Ctrl] and it will use the color under the center of your brush while you paint to tint the image your painting with. Enormous feature!!!
And I did forget the shortcut to toggle it, haha... pffff
When you paint with your image brush, the color you've chosen will multiply with the color of the images you've captured. Choose white to get the full color of them or any other color to tint them.
Armed with that knowledge you can already accomplish a great deal of things. There are only a few more things that are interesting:
[ USE ] will activate images for other brushes like #2, #3 and #9.
[ P ] is turning on perspective correction, if you had deformed your rectangle to capture 3d planes. Unlikely you'll have to or want to use it, but it's pretty awesome. I wrote an interesting shader to make this possible.
Things you can do with this are endless. From wicked nonsense to using it for custom brush stipple changes, using [ PR ] mode to have pressure go through your painted density of paint. Just endless possibilities, really.
My plan was to add even more animation options and proper GUI for all of it, of course. But hey... there will come a day!
Wed May 11, 2022 9:36 am 
GOOD CALL! 
