@dkazakov Thank you for the easy Appimage. I spent the last hours testing it since you posted and doing way and back between 4.3beta appimage to understand the changes.
First, I listed the preset in 4.3 using Smear and tested them without (top) and with the patch (bottom):
As you can see; the change is obviously very dramatic for them.
Then I painted with random new presets I made ( mostly derivating existing ones):
To answer your questions:
Is this version of sliders more convenient for creation of new presets or not?
Yes, sliders can produce more effect and the variation from 0 to 100% is very obvious. It inputs much more control in the preset creation.
Is new effect of smearing better than the old one?
It is still the same effect of smearing, so the effect in itself is not better or worst. But it offer new way to setup the effect and get “stronger and longer” smearing; and this is something new. This patch makes possible the creation of infinite smearing preset (very smeary, like painting with a iron on hot wax, a rare technique.) that makes the pixels area a bit more elastic. It also gives more control to create probably in a easier way subtle Color Rate and Opacity mixes.
My opinion about it:
First; like it. I had quick fun with Smearing based brush and the patch. This patch makes the sliders feels more WYSIWYG and with the preview of the brush stroke in the brush editor it works really well. It also allows stronger effects, and that’s great. But it would break also all previous smearing based presets badly (their effect being way way way too strong).
So, this patch is welcome, but it would require a mechanism to do the reverse math for the legacy smearing brush presets.