question: how to make an xor region fill brush

[ⅼіսḃоtо]

i'd like to make an anti-aliased region-fill brush that XORs the color (flips from black to white) for each self intersecting region and extends this behavior for separate brush strokes.  i can get either one or the other behavior and never anti-aliasing. the two brushes are attached here:

 xor.zip

 

my problem is better explained in this screencapture video (watch full-screen HD to see the aliasing problems)

 

http://vimeo.com/28323689

 

any tips would be appreciated

[Synthetik]

I'll think about it, but i don't think you can totally get where you want to go right now.

 

If you set the Processing 1 parameter in the Region as Brush Mode control panel to Slight Smooth, you can reduce the aliasing at the edges of the painting for the xor-separate strokes paint preset. You could double it up with the Processing 2 parameter to get more smoothing. It's not perfect, but does reduce the amount of stair-stepping associated with the raster region fill.

The Processing 1 and 3 parameters let you select different processing algorithms that modify the region shape prior to it being rendered as a single paint nib. 

 

We don't currently have an odd-even fill winding option for raster regions, the drawn region will always be generated by a winding fill if you are using region fill as brush with raster paint.

 

The other paint preset uses vector painting. We don't currently have an xor blit option for vector painting, but maybe we could add it as an additional feature in the future.

[ⅼіսḃоtо]

thanks, i tried the slight smooth before but it's a bit too soft and too slight for my taste. same for the simple antialias option on processing. wish there was a way to control the amount of smoothing and maybe edge sharpness (transfer function?)

 

i much prefer the "smart blur" ipop. wonder if it would be nice to have something like that available as a region as brush mode processing. i've tried using "smart blur" in dual mode but my problem is that it is cumulative and as i keep laying down strokes the older strokes get "smart blurred" away while the new ones are still edgy. it does not quite work with iterative stroke by stroke animation, which is what i'm trying to do.

[Synthetik]

I'll look into adding smart blur as an option for region fill as brush processing. I agree, it does do a much better job of smoothing arbitrary shapes if configured properly, since it is a spatially adaptive filter that can track edges or the shape of objects.