Red object when importing

[Anonymous]

Hello all,

I have a problem when importing some obj files on mesh mixer. I`m using a cammera for creating 3d facial scan. It creates a Obj file. The file can easily be opened in meshlab but when I import it to meshmixer it apears Red. I can open it in othe PCs and I can open other files stl in my meshmixer. If it is inserted in a previously saved project on meshmixer it will open ok but the import does not work. can you help me? I already tried to replace the Nvidea Geforce GTX controler and nothing. thank you all

[MagWeb]

Seems your OBJ comes with a texture.

Importing such a textured OBJ MM uses the texture shader automatically.

There's something wrong with the file bundle a textured OBJ uses.

There need to be a .OBJ (geometry) which links to a .MTL (material) which links to an image file (maybe .JPG or .PNG or another image format).

In your case the link from the .MTL to the image is broken (in this case MM replaces the missing texture image by a  red image)

In most cases OBJ,MTL and image need to be in the very same directory.

You may check that link opening the MTL in any text editor. There should be a line like

map_Kd SomeImage.png.

It points to an image in .png format, named "SomeImage" and (as there's no further path) expects that file in the same directory as the MTL itself.

-----

If you are not interested in the texture and want to work with the geometry only: You might simply use a different shader dragging one of the non-world spheres from SHADERS onto the object

[Anonymous]

Hello Gunter Weber,

Thank you for your reply. In fact that line exists and the Jpg also in the directory and it works. As I refered, if I copy the all directory to another PC it opens with no problem so I think it is some kind of setting on my PC… About textures, your right that it works with no texture (plain color). That`s the problem. I already tried also to unistal, restart, shutdown and….

Do you have any more ideas?

[MagWeb]

MM has problems loading image files for MESHMIX parts if there are special non-latin chars (characters not used in English language) in the full path to the image file. In most cases such chars appear in the user's account name.

You might check this running MESHMIX: Are there red squares instead of preview images?

If yes:

That might cause your issue too.

Either set a different name for your account or move the directory containing obj+mtl+jpg to a level above the account.

[Anonymous]

 couldn`t belive it but in fact my name is João and the ~is the reason wy this happened. Thank you very very much. You`ve been very important! João

[MagWeb · Accepted solution]

Ha, good to know that this issue happens on texture images too.

Could you hit the AcceptSolution button? 

[Anonymous]

Hi,

Same problem like João, but this time the object is in the USB Disk root...

What can I do to solve it?

Thanks in advance

Abílio

[MagWeb]

The easiest way is to copy your bundle of files from the USB drive to a location on your HDD where no such special char is involved.

If you want to run from the USB drive directly, check the whole path to the files on the drive if there are any of those chars. Note: There might be pretty small differences: e.g.: You signed your post with "Abílio". Its third char is a special one.

[Anonymous]

Hello all,



I`m Portuguese and we have letters that don’t exist in English alphabet. The
problem was that a folder had a letter with a ~ on it. Just that.

Thank you all.

[Anonymous]

Hi, thanks for the reply.

I tried to open from the USB pen, from desktop and with a new user, but i can't open it.

Can be a problem with the Geforce RTX 2080?

[MagWeb]

Think it's not a GPU issue if your object comes out red. This means that MM isn't able to find the image file and uses a default red image instead.

If you made sure that there's no special character in the whole path (also the name of the image file) check the .mtl file.

You can open it using a simple text Editor.

There should be a line

map_Kd SomeImage.png (might be a different image format e.g.  .jpg)

Does that line match to the image file located in the very same directory?

[Anonymous]

Hi, 

Format c: solved the problem 🙂

Thanks!

Regards

Abilio

[Anonymous · Accepted solution]

The problem was Irys from myray, this software controls xray and with it the image appear red. I unistal it and problem solved.

[Anonymous]

Hi everyone, I am having the same problem, but I don't see any problem with special characters.  I will attach a couple screenshots that show a successful preview, the filenames in directory, and big red outcome.

I bought some nice scans of a human arm and am trying to work with them.  They are OBJ files that came with MTL files, but when I try to import the arm into Meshmixer I just get it in bright red without any apparent utilisation of the texture file.

I don't actually really need the texture file, so if there is a way to get things to work without it then great, but it would be nice to just have everything work without problems.  Thank you ahead for whatever advice you could provide.

[Anonymous]

I wish I could edit my last post rather than creating a new one, but I wanted to add a little more detail and additional findings:  When I look at the MTL file in a text editor, I see that it points to a file called 1.bmp, but I have no such file.  When I look at what files I do have, I have a large number of all different kinds grouped as Color, Displacement, Normal, Spec with types jpeg, tif, and tga

Could anyone advice on why there are so many kinds and what I would want to use?  I guess maybe I would want to edit the MTL file to point some one or several different texture files?

Sorry for my cluelessness on this texture stuff.  Hopefully, I'll learn very quickly.  The cool thing is that all the possibilities are exciting.

[MagWeb]

If there's no texture image file MM can't find it and replaces it with a overall red image.

Options:

- Open the .obj file in a text editor and delete the line pointing to the .mtl (e.g. the line:) : mtllib 1.mtl

- Or drag the  grey sphere (which is the default shader) left of the two world spheres(which are texture shaders) from SHADERS onto the object.

[Anonymous]

Thank you for the advice.  Are you able to speculate on why this scan OBJ file I have came with Color, Displacement, "Normal", and "Spec" texture files?  Do models sometimes use multiple texture files simultaneously for different information?  I have so many different texture files but no clear single general one.

[Anonymous]

Hello, when I had that problem I solved it changing the folder where the documents where. I`m portuguese and my name has a ~. Because of this, the my documents folder was under a username that was incimpatible with the program. Try making a root c:/folder and copy the obj and all files (including texture image)there. Then open it from that location. It worked fine with me.

[MagWeb]

Yes, one OBJ may ship with multiple maps used in a decent rendering software. E.g. one can inscribe fine surface details of a high detailed mesh into a displacement map to be used on a low poly version of the same model for animation purposes...

The one used to show the surface's color should be the Color map. Depending on the software it came from you might need to flip the image if it doesn't "fit" to the surface.