Hi everybody, I’m currently developing a sketchup importer for my c++/openGL 3D viewer. Everything look good except for some textures which seem to be twisted along the X axis. After reading from the SUTextureGetDimension function documentation (here : viewtopic.php?f=180&t=58269&p=531281&hilit=d…

The scale factors maps the pixel size to model size (this would be inches as that is the underlying unit in SketchUp regardless of the model’s unit settings.) So if you have an image 500x300 you’d get the model size by: width = 500 * s_scale height = 300 * t_scale This refer to the Width and Heig…

Thanks for the answer Thomas. That’s how the model is rendered (both software) : model unit is centimeter and material box in sketchup said : texture name : untitled.bmp size : 70,8cm x 39,5 cm so i does mean a 2,47cm x 2,52cm almost a square according your informations. I checked the data…

I dumped the texture on disk throught severals sdk methods : SUTextureWriteToFile SUTextureWriterWriteTexture with arg reduce_size set to true SUTextureWriterWriteTexture with arg reduce_size set to false SUTextureWriterWriteAllTextures all dumped textures are squared and free from artifacts. …

[image] pcmodev: texture name : untitled.bmpsize : 70,8cm x 39,5 cmso i does mean a 2,47cm x 2,52cm almost a square according your informations. Hm… You list the image dimension in cms. What are the pixel units? [image] pcmodev: So I don’t understand why my texture is twisted … Are y…

[image] pcmodev: So that’s not an issue which relies on my code or OpenGL. So why Sketchup give me that twisted texture ? That’s a dump of the frame buffer? I’m not sure what all this is - but from your previous post, the actual UV data you got looked correct for a texture applied to a face …

Hi Thomas, Texture’s dimensions are 419x234 pixels. I’m applying the UV mapping according counterclockwise order (openGL default) which is also the winding use by sketchup’s SUMeshHelpers SUMeshHelperGetVertices classes method. If i replace the problematic texture in sketchup for a bigger png in …

[image] pcmodev: Sketchup is sending me a twisted texture and i don’t understand why … The actual texture image? Because the UV data looks correct. (0,0 - 1,0 - 1,1 - 0,1)

Can you post sample model? Also, is the texture applied to the front or back of the face?

Texture’s size is ok, UV map coordinates too. Just the texture’s data (pixels) who are shifted to the right (as on the rawpixels.net screenshot). Texture is applied on front face. I attach the model to this answer. 0981 1 barrière chantier avec panneau.skp (656.5 KB)

I tried that model and exported the texture using the Ruby API: tw = Sketchup.create_texture_writer #<Sketchup::TextureWriter:0x99ffb28> tw.load Sketchup.active_model.selection[0], true 1 tw.write_all(ENV["HOME"] + "/Desktop/", true) true And that resulted in a correct image. Do you have a samp…

How should i use s and t scale factor from SUTexture?

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tt_su December 8, 2014, 11:00am 6

That’s a dump of the frame buffer?
I’m not sure what all this is - but from your previous post, the actual UV data you got looked correct for a texture applied to a face as shown in your screenshot.

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How should i use s and t scale factor from SUTexture?

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