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The bug affect the curvature fill created by using Smart Material on that way. The layer created by baking curvature can be smoothed without issues.

I'm surprised that no one has noticed this before, it affects both convex and concave curvature and anyone using curvature for highlights and shadows will need to fix it somehow. How do people normally just fix it, just through the smart material itself?

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bug confirmed thanks for point it up

Like I put in the message, it's not the model, this is just an ordinary sample that I just pulled from a library. I have 10 other sample clothes wears that does the same thing, this is a specifically a 3D coat issue I'm having. I even tried with a default cube, same issue. I am asking about how to smooth out curvature using painting brushes or airbrush, it won't let me. Is there a way I can smooth it out after using a Smart Material with convex condition and adjusting the contrast. If I try to use airbrush or regular brush, I get these results on all different kinds of meshes. There doesn't seem to be a way to smooth out curvature on any meshes that I have found, not even power smoothing will work.   You can literally test this out on a mesh of your own that has bumps and edges, any mesh even a normal human mesh. Just import it in, bake a curvature RGB which is the default one. Create a new layer with an empty smart material and adjust the contrast and edge width of the curvature and use a fill bucket and just paint a single layer so now your mesh has curvature painted on it. Now try to go into that layer with an airbrush or the paint brush and try to smooth that curvature, it won't let you. Why is that, and how do I smooth it?

Hi Could you share the model (PM) to take a look please

Hello Carlosan,   I'm trying to smooth my curvature lines because they are too harsh using any of the brushes, airbrush included but it does not work. It worked once the first day I tested it, but it has stopped working and I've restarted 3d coat, used several different meshes but it just acts very weird now. If I use airbrush, it'll act like lock transparency and I can only paint on the curvature portion without smoothing the edges, if I use other brushes weird patterns pop up underneath.  How do I fix this so I can smooth curvature lines or paint without these weird underlying patterns? Here's some pictures to show whats happening, the mesh itself is just an example this happens on all meshes so that part is not relevant.  In the first picture, smoothing has no effect on the pink curvature, the curves remain sharp. The 2nd picture if I use a normal default brush and try to paint, it creates this weird outline and pattern underneath. Worst, I can't even edit it in photoshop externally because nothing shows up in the layers.psd except an empty layer.   

It seems like when using 3D Coat and PS link, doing Ctrl + S in Photoshop with the mask still intact will also not send it back over to 3D Coat, which makes me believe that from a technical standpoint, this bug doesn't delete the mask, but rather the link to the mask is lost and unwilling to be restored. So perhaps the mask is actually still there in 3D Coat and simply not correctly loaded?

It just gets worse and worse. It seems like loading an old backup or auto-save of the same file where the mask was still intact will also corrupt that backup's mask layer (thus irreversibly corrupting all backups as well, as restarting 3D Coat without saving the files and trying to open those files again in a new instance results in the same corruption of masks). At this point I have unbound my Redo and Undo so as not to accidentally destroy anything and am working without them.

Also, I have noticed that Ctrl + Z will sometimes also invert the mask's colors.

Thanks, also I'm on Windows 11, using 3D Coat Textura version 2025.17

This issue was reported https://3dcoat.com/mantis/view.php?id=2594 Thanks for point it up

There is an easy and reliable way to irreversibly delete all masks when painting. Please fix this ASAP; this is a devastating bug! How to reproduce: 1. Create a mask in the layer outliner 2. Paint like 10 strokes onto this mask 3. Click on another layer in the outliner 4. Press Ctrl + Z (undo) >>> The last mask will instantly be gone instead of slowly undoing the 10 strokes. Even worse, a Ctrl + Y (redo) will not be able to get this mask back again This is one of multiple ways I have found to make masks vanish out of existence. I can't stress this enough: put some dev on this as soon as possible. Bugs that cause irreversible damage to a file that can't be undone via Ctrl + Z/Y should be the number one priority. (As a bonus, here is a short clip showing it off: https://imgur.com/Ca86pH4)

There is an easy and reliable way to irreversibly delete all masks when painting. Please fix this ASAP, this is a devastating bug! How to reproduce: 1. Create a mask 2. Paint like 10 strokes onto this mask 3. Click on another layer in the outliner 4. Press Ctrl + Z (undo) >>> The last mask will instanly be gone instead of slowly undoing the 10 strokes. Evene worse, a Ctrl + Y (redo) will not be able to get this mask back again This is one of multiple ways I have found to make masks vanish out of existence. I can't stress this enough: put some dev on this as soon as possible. Bugs that cause irreversible damage to a file that can't be undone via Ctrl + Z/Y should be the number one priority.

My version of a well worn and abused flying car used by Police to patrol the sky highways of dystopian city in the future. I originally blocked out the vehicle using Groboto 3D several years ago and recently decided to flesh it out more and add detail using Blender and Groboto 3D. All texturing was done in 3DCoat 2026.