How do I fix the textures?

I am trying to fix the textures on the Hestia, can someone help on that?

 

Did you play around with the .dae file?
In Blender, before exporting, you need to apply autosmooth to every mesh in the range of 45-60 degrees (I’d say 55 bc this is a pretty round car).
It’s easy in newer versions, since you can select everything, right click, and press “Shade Auto Smooth”. In older versions of Blender, you need to go to the tab on the right with the green triangle, then to “Normals”, then with everything selected, tick Autosmooth, right click the tickbox, and press copy to selected. Then input an angle range, right click that, and once again, copy to selected.

 

Yes, cuz I am trying to make a parts mod.

 

Added instruction to the post where I asked the question

 

It makes it even worse in my case.

 

Huh. That shouldn’t happen. Maybe set it to something lower, like 45?

 

Here's what it looks like.
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Bear in mind, I am a beginner..

 

That’s good!
Now, when you export it again, in-game it should be better.

 

Nope. Problem remains.
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*sigh* Now it looks like this..

 

Don't export the body with your mod. Also rename its 3d object in your project so it is not used ingame by default

 

But it was good?!
You have to do this every time you import the .dae

 

Original Hestia creator here

The Hestia model is made of quad-poly + weighted normal, but when it is exported to dae, it is automatically exported triangulate-poly resulting in such shading problems

The way to solve the problem is simple, you can turn off this Triangulate option when exporting to dae


And when you add your own parts, you don't have to export all the models