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thomthom / quadface-tools

Suite of tools for manipulating quad faces in SketchUp.
https://extensions.sketchup.com/en/content/quadface-tools
MIT License
18 stars 1 forks source link

OBJ exporter and Substance Painter #120

Open alsomar opened 4 years ago

alsomar commented 4 years ago

When you export an obj file made with QFT to Substance Painter, the automatic UV's go nuts. But if I just open the obj file and save it with Blender, then the SP's automatic UV's work fine.

QFT obj directly loaded in SP SP1

QFT obj opened and saved in Blender, loaded in SP SP2

Here's a zip with both OBJ files: obj-files.zip

SP 2019.3.x creates automatic UVs for models without UVs. You only have to go to File > New and then press "Select" to select the obj file you want to open and OK. Then Substance Painter will add an automatic UV mapping while it opens the file.

thomthom commented 4 years ago

Can you also attach the original SKP file?

alsomar commented 4 years ago

Yes, sure! But it happens with all OBJ exports I've tried.

test.zip

alsomar commented 4 years ago

Hi there Thomas, I hope you're safe and healty. I have digged deeper into this and I'm quite sure this issue comes from the triangulation of the quads. I've done several test on my own and the UV's with isolated quads on Substance Painter only appears when the obj comes from a SketchUp model with triangulated quads. If I delete the triangulation then the UV's are fine. I'm attaching a couple of pics to clarify my point.

Quad based SketchUp model WITHOUT triangulation, exported to Substance Painter with QFT OBJ exporter QFT_regular-quads

Quad based SketchUp model WITH triangulation, exported to Substance Painter with QFT OBJ exporter QFT_triangulated-quads

thomthom commented 4 years ago

I'm not that familiar with Substance Painter yet. Can you do a step by step for Dummies on the steps from SketchUp to Substance? Export settings in QFT and import settings in Substance. (Along with the model above?)

alsomar commented 9 months ago

Hi there. I've realized what's the problem: OBJ exporter from QFT is creating the quads detached just because the quads' edges are being exported as borders. This happens only in Quads with a diagonal edge/triangulated). That makes Substance Painter and some other software like RizomUV unable get a continuous surface.