[Plugin] OBJexporter v3.0 20130131

meff1091 · 20 Mar 2016, 10:29

i am using your objexporter to export my models to pepakura to make paper model of them. i am having this issue:
if my model has different coloured faces like this:

, exported obj file look like this in pepakura:

and i am sure all edges connected. if i export kmz4 with skp6, i have no problems with pepakura. but you know sketchup 2016 is newer and faster than old one. i want to use the 2016 but this objexporting issue botters me. any ideas on this?

TIG · 25 Mar 2016, 18:08

OBJ exporters typically triangulate the 'mesh'.
It's hard to see exactly what the problem is in 'Pepakura' ??

myreiko · 19 Aug 2016, 07:40

ty

Saturo · 16 Jul 2017, 20:14

I have the problem that the OBJexporter sometime produces shading error like this:

Any suggestions how i can prevent this?

TIG · 17 Jul 2017, 10:13

A little more info about what we are looking at, perhaps a SKP exhibiting the problem, or an OBJ/MTL/Textures ZIP ?

Otherwise it'll involve wild guesses...

Saturo · 17 Jul 2017, 21:03

The issue can be easily reproduced.

Build a face. Place two other faces on it an put another material onto these two faces.

Save and export as .obj-file.

Import in Blender.
After remove doubles and limited dissolve you can see normals not standing in 90° on the face, which are causing these shading errors, i guess.

](http://picup.oliverlamm.de/files/IMG_9415199a237946b96b06371ef659aea7_36mzFlCf85_Ok.jpg)

If needed, i can upload the used files.

best regards
Christian

TIG · 17 Jul 2017, 21:24

Some examples files would be a very good idea - use ZIP for those non-compliant file-types...

Saturo · 18 Jul 2017, 04:48

Here are the test-files.

Test-0.zip

TIG · 18 Jul 2017, 11:26

The geometry is triangulated in the processing.
With this exporter and the Pro exporter as well.
Giving the face distortion you see.
It's not an option to NOT triangulate [unlike Pro exporter]
With no triangulation the distortion is not seen.

Saturo · 18 Jul 2017, 12:27

This means no chance to solve to problem?
Using the .dae export the geometry is also triangulated but there is no face distorsion.

TIG · 18 Jul 2017, 12:41

This is an old plugin which is unlikely to be developed further.
Since the Pro exporter exhibits the same distortion issue with triangulated faces I expect it would not be easily solved.
Using the Pro exporter without triangulation sidesteps the issue but of course you may need triangulated faces for other purposes.
Why can't you use the native DAE Collada exporter ?
If that avoids the issue and you need an OBJ for some other reason does it export from Blender without distortion ?

Saturo · 18 Jul 2017, 12:50

The Collade exporter works fine if the model has no texture.
I'm looking for a way to export objexts with texture and import it to blender.

When i use the .dae fomat the texture behaviour is very strang for example: textures dissapear when i join objects.

I was very happy when i found die OBJexporter because it exports the modell and texture very well. Unfortunally these distorsions make it unuseable.

Maybe i have to test the .stl exporter too.

Saturo · 18 Jul 2017, 16:36

I build a model in sketchup. Then i export it as .dae file, import it in blender and use remove doubles and limited dissolve. After that i texturize the model.
In this step, I often find minor errors on the model which i can't repair in blender.
This means back to sketchup, fix the problem, export as .dae an so on.

Therefore i had the idea to apply the texture directly in sketchup where i directly can fix these minor errors and afterwards export it to blender. But in this case i had the problem that the texture in blender dissappears when i join objects to do remove doubles and limited resolve just once. Without that step ich have to do remove doubles and limited resolve more than a hundred times

This is why i'm looking for other ways to export the textured modell to blender.

foxnadir · 3 Apr 2018, 04:28

@tig said:

@e0068675 said:

I cannot thank you enough for making this exporter!!
You have literally saved me hundreds of $$$$
== Donation

Hi, TIG!

I downloaded your exporter and now trying to get my SketchUp model to Octane Render scene. But it asks for OCS/ORBX files (or whatever). How to do that?

Thank you in advance

TIG · 4 Apr 2018, 16:43

Octane used to be able to import OBJ files.
I haven't used it for a long time.

It 'Opens' its own file formats- like OCS.
It 'Imports' other file formats - like OBJ.

Make sure you understand the difference between Open and Import...

chanz · 5 Jul 2018, 09:22

Hi TIG,
Does this plugin do any sort of vertex welding? I am noticing that vertices are welded/combined somewhere in the import/edit/export process with the native SketchUp exporter. Of course for most people, it's a welcomed optimization but for me, I need to keep the vertices unique.

Thanks

andybot · 5 Jul 2018, 14:55

The first versions definitely didn't weld vertices. I recall vividly because it added extra steps for me when exporting. It doesn't look like any of those older versions are here though. You might find it floating around on the web in some older plugin repositories.

chanz · 5 Jul 2018, 15:01

@andybot said:

The first versions definitely didn't weld vertices. I recall vividly because it added extra steps for me when exporting. It doesn't look like any of those older versions are here though. You might find it floating around on the web in some older plugin repositories.

Thanks for the reply. While I have you here, is vertex welding something that SketchUp does internally? I am having issues where I need to load an OBJ and then export the OBJ without any modification to the vertices at all. No optimizations for any reason as I render using texture arrays and need the unique vertices to set the texture index. I wrote a post in the main forum but nobody has replied yet. Figured I would ask.

Thanks

chanz · 5 Jul 2018, 20:18

Looks like vertex merging was added in the latest version. Anyone know if we can find older versions?

2.9 20130130 Merging of shared vertices is now optional, as it slows processing
for larger models.

andybot · 5 Jul 2018, 20:38

@chanz said:

Thanks for the reply. While I have you here, is vertex welding something that SketchUp does internally? I am having issues where I need to load an OBJ and then export the OBJ without any modification to the vertices at all. No optimizations for any reason as I render using texture arrays and need the unique vertices to set the texture index. I wrote a post in the main forum but nobody has replied yet. Figured I would ask.

Thanks

I don't believe that is internal to SU. You might try using a different export format (like .dwg or .3ds format) and then convert to obj in a different app (like Blender or FreeCAD)