Idea: example to render and save as a 3d model #83

OBJ and STL don’t have texture data stored with them, so while the 3d structure of these would show up, it wouldn’t look like Minecraft, it would just a wireframe. Maybe GitHub supports other formats? Otherwise there could be an example to export the scene, should be pretty easy to do.

I'm not sure I understand. Obj files have colors. Is it relying on a different mechanism ? Can we use it ?

On Sun, Dec 20, 2020, 13:37 extremeheat notifications@github.com wrote:

OBJ and STL don’t have texture data stored with them, so while the 3d structure of these would show up, it wouldn’t look like Minecraft, it would just a wireframe. Maybe GitHub supports other formats? Otherwise there could be an example to export the scene, should be pretty easy to do.

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Same question for stl https://github.com/Kitware/F3D/blob/master/data/suzanne.stl

On Sun, Dec 20, 2020, 13:50 Romain Beaumont romain.rom1@gmail.com wrote:

I'm not sure I understand. Obj files have colors. Is it relying on a different mechanism ? Can we use it ?

On Sun, Dec 20, 2020, 13:37 extremeheat notifications@github.com wrote:

OBJ and STL don’t have texture data stored with them, so while the 3d structure of these would show up, it wouldn’t look like Minecraft, it would just a wireframe. Maybe GitHub supports other formats? Otherwise there could be an example to export the scene, should be pretty easy to do.

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.obj and .stl files are primarily for exporting geometries/vertices of 3D objects and don't have support for embedded texture data. So you have to include this data externally in a separate file like .mtl.

It looks like some implementations of .obj might have support for embedded colors (1), but it's not standardized AFAIK. Looks like it's the same for .stl. But even with the basic colors, it's not minecraft textures or anything. It might work if we make a color map, but the block faces would be of solid color, if this makes sense.

Ok.

My main idea in this issue was to build some exporters so minecraft part of worlds could be reused in other tools.

It seems obj and stl are pretty common but anything else could be interesting too.

I'll look into it to see what are useful formats for various use cases (importing in 3d modeling tools, importing in visualization tools, importing in ml pipelines,...)

On Sun, Dec 20, 2020, 14:15 extremeheat notifications@github.com wrote:

.obj and .stl files are primarily for exporting geometries/vertices of 3D objects and don't have support for embedded texture data https://github.com/PrismarineJS/prismarine-viewer/blob/gh-pages/standalone/textures/1.10.png. So you have to include this data externally in a separate file like .mtl https://en.wikipedia.org/wiki/Wavefront_.obj_file#Material_template_library .

It looks like some implementations of .obj might have support for embedded colors (1 https://gamedev.stackexchange.com/questions/21303/how-can-i-include-vertex-color-information-in-obj-files/66270#66270), but it's not standardized AFAIK. Looks like it's the same for .stl https://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL. But even with the basic colors, it's not minecraft textures or anything. It might work if we make a color map, but the block faces would be of solid color, if this makes sense.

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obj and stl are mainly popular for 3d printing. The standard for game / textured assets exchange is gltf.

https://www.khronos.org/gltf/

Yeah, gltf is a good idea and three.js has a built-in exporter for it. But it would be cool to have a giant repo of schematics on github, so you can see them straight from github. Unfortunately I don't see any other supported formats other than .stl so maybe we could do stl exporting and see how that looks? So at least you have something to look at right in the repo. Otherwise this could be done on Github pages. GLTF is JSON based, so it should be easy to use for ML tasks. It might get complicated when it comes to identifying blocks though, maybe the solid face colors in STL would be better for that use case.

https://github.com/Doodle3D/ThreeJS-export-OBJ https://github.com/Doodle3D/ThreeJS-export-STL references ^

#113

now done, results at https://gist.github.com/rom1504/7a1eda7db13ea1f65373dc0b42e550fa

can be viewed at https://gltf.insimo.com/