Axis of Ratio scaling

[Michos]

Is there a way to decide on which axis will the brush tip be scaled based on pen input?

I’m trying to create a brush that will get horizontally denser with stronger pen pressure (Ratio/Pressure), and also align itself to the drawing direction (via rotation/drawing angle) but right now all I can get is a tip that gets thinner vertically.

(rectangles used for illustrative purposes, I actually need a brush that has a much elaborate, symmetrical shape)

@Me being wrong

I can theoretically get my result by setting the default rotation of my brush tip to -90 degrees, and then having Drawing Angle offset by 90 degrees, however this messes up the brush preview

Wrong, doesn’t seem that I can actually do that. what I CAN do is stretch the actual pen tip many, many times, then scale the ratio, but - that messes up the preview even more.

[Mythmaker]

To be honest I’ve had trouble getting my head around this; I think the current implementation does only work on one axis - I’m pretty sure I remember someone saying that and I think that person was @RamonM.

I have used the ratio feature, and I know some of Ramon’s brushes use it. I’ve found it quite difficult to gauge the effect when creating brushes though.

I’m trying to visualise if saving the brush tip in a different orientation would produce the desired effect - but I’m not sure.

[wojtryb]

How about using angle offset in rotation options instead of the default angle? I guess it allows to rotate the brush after it gets squashed with ratio-pressure. Is that what you’re aiming for?

[RamonM]

Thanks @Mythmaker for quoting me. I think in this case i don’t have the solution. I did this video and reported directly to @dkazakov, maybe i was mising something? Maybe he is more helpful here.

https://drive.google.com/file/d/1hACR4VlchU8lLW9EPbDA82FfVFVpgrAA/view?usp=sharing
This is what i reported, when he provided a release with ratio in color smudge. A useful feature

[AhabGreybeard]

I can do it simply and crudely in accordance with the ‘Desired’ sketch of the diagram provided, with rotation following the drawing angle too.

I modified Basic_2 Opacity; the brush tip is a square with Rotation of 90 degrees. The Ratio vs Pressure is as shown below:

This may be what you need.

[Mythmaker]

Thanks for sharing that video - it helped me get my head around it too!

So basically - in it’s current implementation, the ratio is applied to the brush tip as a compression along the Y axis. This is applied to the original state of the tip as it is saved - so changing the rotation setting doesn’t affect how the ratio is applied.

So as Ramon demonstrated in the video - the solution is to save the tip correctly oriented to the Y-axis to achieved the desired compression.

Is that right?!

[dkazakov]

Okay, that can be reported as a feature like “Add an option to invert Ratio sensor axis”. It should be really easy to implement.