### Author:  [@Richard\_Simmons](https://discourse.paraview.org/u/Richard_Simmons)
#### Post date: [December 6, 2018, 6:54pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/1 "2018-12-06T18:54:21Z")
I have CAD models with colors already applied (.obj (with .mtl)). How do I import the .obj file and apply the .mtl file to display the colors correctly? I have not found a clear or concise way of doing this.
Also, would the same method apply to a .vrml file which contains color information?
I am not familiar with OSPRay settings or creating my own color editor colormap.
Thank you, I love using Paraview to display scientific results, I would just love to be able to overlay that data on great looking CAD models.
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [December 6, 2018, 7:53pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/2 "2018-12-06T19:53:20Z")
We have a macro or python script that can be used with Paraview to create a state file with all the settings properly done.
That script is available here:
>
HTH,
Seb
---
### Author:  [@Richard\_Simmons](https://discourse.paraview.org/u/Richard_Simmons)
#### Post date: [December 7, 2018, 2:29pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/3 "2018-12-07T14:29:03Z")
A couple questions…
1. Do I have to ‘edit’ the python file each time I want to load an .obj file? I’m assuming I have to change the ‘User conifguration’ each time and change the ‘objToLoad’ and ‘mtlToLoad’ variables.
2. Are the installation steps: Macros–\>Add new macro? I changed the path and file names to load and then loaded the macro, but nothing appears to happen when I click the macro’s button.
3. Are ‘objToLoad’ and ‘mtlToLoad’ the correct variable names? I don’t see those being used in the script?
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [December 7, 2018, 5:18pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/4 "2018-12-07T17:18:15Z")
If you use that script as a macro, then yes you will have to edit that script.
But you can also use it as a data converter for ParaView which will then make it easy to load such scene inside ParaView.
To use it as a script just run the following command:
```auto
/path/to/paraview/bin/pvpython obj-mtl-importer.py /path/to/your/file.obj
```
The script will assume a file `/path/to/your/file.mtl`.
This will create a `/path/to/your/file-pv-state.pvsm` file that correspond to a state file that can be loaded in Paraview which will then contains all the textures and various settings the obj/mtl contains.
---
### Author:  [@Richard\_Simmons](https://discourse.paraview.org/u/Richard_Simmons)
#### Post date: [December 7, 2018, 6:46pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/5 "2018-12-07T18:46:59Z")
This is what I get when I run it from the cmd prompt:
Traeback (most recent call last):
File “obj-mtl-importer.py”, line 358, in
loadScene(objPath, ‘%s.mtl’ % objPath[:-4])
File “obj-mtl-importer.py”, line 337, in loadScene
objReader = OBJParser(objFilePath, ‘usemtl’)
File “obj-mtl-importer.py”, line 47, in _init_
self.parseLine(line.rstrip(’/n’))
File “obj-mtl-importer.py”, line 120, in parseLine
self.vn.append(float(tokens[3]))
ValueError: could not convert string to float: \
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [December 7, 2018, 8:28pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/6 "2018-12-07T20:28:58Z")
This could be related to some weird formatting in your obj. I’m guessing you are on windows?
---
### Author:  [@Richard\_Simmons](https://discourse.paraview.org/u/Richard_Simmons)
#### Post date: [December 7, 2018, 8:43pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/7 "2018-12-07T20:43:51Z")
that’s correct
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [December 7, 2018, 10:50pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/8 "2018-12-07T22:50:34Z")
Would is be possible to share that obj/mtl privately with me to see what could be the issue?
---
### Author:  [@Richard\_Simmons](https://discourse.paraview.org/u/Richard_Simmons)
#### Post date: [December 11, 2018, 7:03pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/9 "2018-12-11T19:03:04Z")
Everything is working… I found out what I was doing wrong… when using tab completion in the cmd prompt, I was specifying the .mtl instead of .obj
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [December 11, 2018, 7:46pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/10 "2018-12-11T19:46:26Z")
Glad it is working and it was an easy fix…
---
### Author:  [@fengzekang](https://discourse.paraview.org/u/fengzekang)
#### Post date: [August 1, 2019, 2:46pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/11 "2019-08-01T14:46:56Z")
Dear Jourdain
I have finished the exchange from .obj and the assumed file .mtl. And also there is no error when I compile the script. Finally I got the .pvsm file, but how should I open it in paraview. I check that paraview can not be open the .pvsm type. How should I do this ?
Regards.
Feng
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [August 1, 2019, 3:06pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/12 "2019-08-01T15:06:18Z")
.pvsm are state file which means that you need to do “Load state” rather than “Load dataset”.
---
### Author:  [@fengzekang](https://discourse.paraview.org/u/fengzekang)
#### Post date: [August 1, 2019, 3:15pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/13 "2019-08-01T15:15:17Z")
Thanks for your reply. I tried to load state with my .pvsm file. There is no visualization in the paraview. Can I send you my file? I am confused.
Regards.
Feng
---
### Author:  [@jourdain](https://discourse.paraview.org/u/jourdain)
#### Post date: [August 1, 2019, 3:26pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/14 "2019-08-01T15:26:47Z")
Do you also have a bunch of vtp and images on the side of your state file?
---
### Author:  [@fengzekang](https://discourse.paraview.org/u/fengzekang)
#### Post date: [August 1, 2019, 3:31pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/15 "2019-08-01T15:31:58Z")
[example3.rar](https://discourse.paraview.org/uploads/short-url/d91I57SCCWyK2xs9nOJVrzb8S5x.rar) (1.4 MB)
There are files which I used. First I run the command /patch/to/…/pvpython obj-mtl-importer.py /patch/to…/1.obj and I got a new file 1-pv-state.pvsm and I load state in paraview with it(all files in this compressed file). But there is just nothing in paraviewer…
Regards
---
### Author:  [@fengzekang](https://discourse.paraview.org/u/fengzekang)
#### Post date: [August 1, 2019, 3:34pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/16 "2019-08-01T15:34:36Z")
nothing in the window…
---
### Author:  [@fengzekang](https://discourse.paraview.org/u/fengzekang)
#### Post date: [August 1, 2019, 3:52pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/17 "2019-08-01T15:52:27Z")
Dear Sebastien
I have deal with it. I load state and then view it in the database window. And I got the result which include image and obj mesh.
Thanks a lot
Regards~~
Feng
---
### Author:  [@gilcu2](https://discourse.paraview.org/u/gilcu2)
#### Post date: [October 17, 2019, 2:23pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/18 "2019-10-17T14:23:50Z")
Hi, can you explain how do you show the rendering. I followed all the step, have my state loaded with several objects in the pipeline but nothin is showed.
Thanks
Reynlado
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 18, 2019, 2:59am UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/19 "2019-10-18T02:59:23Z")
You may want to open a new topic to explain your own issue.
---
### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [January 7, 2020, 7:35pm UTC](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012/20 "2020-01-07T19:35:58Z")
I believe this topic is referring to the same problem described in [https://gitlab.kitware.com/paraview/paraview/issues/19240](https://gitlab.kitware.com/paraview/paraview/issues/19240)
The issue was [resolved](https://gitlab.kitware.com/paraview/paraview/merge_requests/3505) prior to the ParaView 5.7.0 release.
[Next page](https://discourse.paraview.org/t/wavefront-obj-with-materials-mtl/1012.md?page=2)