Since the I can’t raise issues on the GitHub C API tracker currently (non Trimble Employees can’t seem to do this), I’ll raise here. I’ve been struggling to get textures working on my Ruby C Extension for some time. Specifically, I am trying to copy textures from one model to another. All seems t…

Have you tried using a TextureWriter ? If this does not work, ImageRep class came out with SU2018. You might try going through a ImageRep rather than a file. (Probably faster as well.)

Backstory: see past topic from 2018: Setting Materials’ Texture scale - Developers / SketchUp SDK - SketchUp Community … which resulted in me filing the API Issue: C API function to set texture scale · Issue #40 · SketchUp/api-issue-tracker … which was finally implemented seven years later with …

[image] DanRathbun: [image] DanRathbun: Backstory: see past topic from 2018: Setting Materials’ Texture scale - Developers / SketchUp SDK - SketchUp Community … which resulted in me filing the API Issue: C API function to set texture scale · Issue #40 · SketchUp/api-issue-tracker … which…

[image] TommyK: If I have to use SU2025 and up, I can make it work for my project. At least anyone else bumping into this can see the issue. OK, so I have tested SUTextureSetDimensions in SU2025, and this is also broken. In Model Texture: Name:Thom_Trousers_Diffuse.jpgx00 width:1000 height:1…

Dan alerted a lot of people, and hopefully someone who knows C API better than I do can help. I did check the code though, and everywhere that s_scale and t_scale are, they are set as double.

Thanks, Colin, I got it wrong - SUTextureSetDimensions is NOT broken in the way that I mentioned earlier (I was looking at the output of a different function). But it is still not correct. The actual outputs I get are: In Model Texture: Name:Thom_Trousers_Diffuse.jpgx00 width:1000 height:1000 s_…

I did not! I should have looked. That is informative. It is confusing though. The situation that currently exists is: s_scale and t_scale retrieved through SUTextureGetDimensions can be say 0.5 and 0.5 using SUTextureSetDimensions, you set a texture to have s_scale and t_scale values of 0.5 an…

I looked at the unit test, and values of 1 and 4 are sent in, then checked to see if they are now 1 and 0.25. I couldn’t easily see why it’s the inverse. Given what you now know, is there a problem, other than the variable name could be improved?

API documentation could definitely be improved. On a related note, it is not clear how the same thing is done with the Ruby API. It has a method to set size in inches not scale factor.

SUTextureCreateFromFile() fails to set s_scale and t_scale

Developers SketchUp SDK

DanRathbun December 4, 2025, 3:26pm 8

Do you remember this thread:

SUTextureGetDimensions scale issue - #6 by DanRathbun

Topic		Replies	Views
Setting Materials' Texture scale SketchUp SDK	2	2163	February 5, 2018
How should i use s and t scale factor from SUTexture? Developers	20	6886	December 10, 2014
SUTextureGetDimensions scale issue SketchUp SDK	6	812	October 17, 2022
How to get a texture's size? SketchUp SDK	11	4554	July 10, 2019
Get a SUImageRef and write the texture with SUTextureWriteToFile SketchUp SDK	9	2874	April 9, 2015

SUTextureCreateFromFile() fails to set s_scale and t_scale

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