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im making a model for an university assignature. it consists of a geology cross-section with realistic terrain in the top, and flat faces in the sides. I don't really know if the edges of the faces are completely parallel to z axis, because i made these by myself. I used the extrude tool plus the 0 button and shift + z to supposedly align all vertices extruded in a planar fashion (don't remember exactly how i made it sorry), then i erased the interior lines and vertices of the model keeping only the vertices and edges of the extremes, but when viewing the result, the edges were slightly oblique to the axis, so i moved manually the vertices to align were i thought they looked good.

Anyway, my problem is when i tried to texture paint it. I previously selected the face and unwrapped it, created a simply blank texture in paint.net and assigned it to the face. When i paint a straight line in the 2d view, the 3d model show an offset pattern of the lines as the first image illustrates. How i could fix this to make the painting smooth and intuitive? Additionally, it would be very nice if there exist some smart way to edit the image in a third party software, using the black line that delimits the selected face in the UV editing menu, like shown in the second image. That would make my job much easier when it comes to drawing the geological strata and layers for the planar cross-section.

Thanks in advance.

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enter image description here

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I have had similar problems, It could be that the UV is not "flat", but it does not look like it from the picture. the other experience I had a distortion because the model was too low poly, from the UV editor picture It looks like the face is an N-gon, you could try adding more geometry to it.

As for exporting the UV lines to paint in another software you can Export the UV layout, there is an answer here.

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  • $\begingroup$ thank you for answer. Sorry, im very newbie in blender because i only used this software to make this specific uni task, so i have to ask you, which would be the best way to add more geometry to my model (and how? plz). $\endgroup$
    – Coke Lobos
    Jul 15 '20 at 20:42
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First things first, NEVER paint on an n-gon. (base of every surface is triangles so triangulated faces are the perfect surface to paint on) 2nd paint on more/better resolution mesh

Here is a sock I made for baking but I had to simple subdiv it so I would not get errors.

enter image description here

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  • $\begingroup$ ty for answer me. i have to ask you, how i could make my surface get fill with triangles as you suggest. I would need a step by step explanation because im noob using this software, sorry. $\endgroup$
    – Coke Lobos
    Jul 15 '20 at 20:44

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