OpenGL visual model texture file

[mikelitu]

Hello everyone,

I am trying to load some textures for my visual models in SOFA. I am currently following this procedure:

1. I create my mesh in Blender
2. I use the UVEditing from Blender to draw my texture (the mesh is unwarp using the smart UV projection from Blender).
3. I save my texture to a new image
4. I load my textures using the flag texturename at OglModel.

However, this makes my texture to look really weird on the SOFA model. I have aslo tried drawing the texture as whole image, not taking into account the unwarping from Blender. Is there something I am missing out? I leave some examples with really simple geometries below, so you can visually understand what I mean:

Painting following the unwarping from Blender

Rendering result in SOFA

Painting the whole image

Texture example of the whole image painted Rendering result in SOFA

[hugtalbot]

Hi @mikelitu
Could you share the part of your SOFA scene involving the rendering please?

Our expert in rendering @fredroy is currently away, I will point him this topic when he gets back

[epernod]

Hi,

how do you connect your MeshLoader to the OglModel? you need to link the Data "texcoords" and if you are using multiple texcoords for the same position you need to use the Data vertices and use the option handleSeams as @hugtalbot said.

[mikelitu]

Hi @epernod,

Currently I was just using the flag texturename, is there a way to modify the "texcoords"? Or even to export the ones from Blender and use them in SOFA? I just discovered than increasing the resolution of the sphere made the texture appear on the sphere, so not sure what the issue is.

[epernod]

If you generate the texture and mapped it in blender, you just need to export in obj.
Then in your SOFA scene you load the file and activate handleSeams.
Finally in the OglModel you need to set the textureName with the .PNG path and set the texcoords to one loaded in the MeshObjLoader.
You Can see an example here: https://github.com/sofa-framework/sofa/blob/master/examples/Demos/TriangleSurfaceCutting.scn

[mikelitu]

Hi @epernod,

Thank you for your help. Now I have understand how the process works. Basically everytime I have a new 3D model I should load it in Blender and UV edit the material on the mesh so I generate new texcoords for the model. I have to save everything to OBJ (I was using STL before, but I understand that it does not work for this file type). I will test it in all my models by the end of this week and let you know if I find any new issues, but I think this probably solved now. Thank you so much again for your help to both @hugtalbot and @epernod.

[hugtalbot]

Great, keep us posted @mikelitu
Thanks @epernod for the support

[github-actions[bot]]

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@mikelitu
Feedback has been given to you by the project reviewers, however we have not received a response from you. Without further news in the coming weeks, this discussion will be automatically closed in order to keep this forum clean and fresh 🌱 Thank you for your understanding

[github-actions[bot]]

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@mikelitu
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