Sculpting texture mid-level


originally, I planned to get better at sculpting this year - and since there are still a few hours left of 2020 I figured, I probably should start working on that. :wink:

So, I just tried to make a few textures for sculpting. Until now, I was under the impression that these textures would work like the Displacement Modifier textures: dark areas lower the surface, light areas raise the surface. (And a mid-level can be set.)

Unfortunately, I just can’t get that to work with sculpt brushes. Based on the brush’s +/- setting the texture seems to lower OR raise the surface but not both.

When searching for a solution I stumbled on this rightclickselect thread “Would it be possible to get a true Alpha Sculpt Brush?” which suggests that it just isn’t possible to have both at the same time.

Does anyone know if this indeed isn’t possible? It feels a little strange as the Displacement Modifier’s behavior is making a lot of sense to me.

Thanks for your help.

A texture always holds positive values (at least for file formats that I know of) so if there’s no midlevel setting for alpha or color then it’s not possible to calculate the negative part. Displacement has one but sculpting brushes don’t. Probably a very easy setting to add, not sure why hasn’t been implemented yet.

Thanks Blutag. That is what I suspected. But, I hoped that I just didn’t look in the right place. I would never have guessed that this didn’t work this way in sculpt mode.

It doesn’t sound that difficult, indeed. And even a single checkbox like “midlevel at 127” (I guess someone could come up with a better name) would make a huge difference. (Of course, a custom midlevel would be even better.)

Of course it’s possible…
Start here and keep reading… :wink:

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Sorry for taking that long to respond. And thanks for pointing me in that direction.
I’m still a little confused by the setting’s name and sample bias unit. But setting it to -0.5 seems to work just fine. If I’m not mistaken, this is just what I was looking for. :slight_smile:
Thanks a lot!

Aha, so it was hidden under a weird name. That’s a good find! So it takes the value from texture + bias, then yeah -0.5 bias is a good middle value.