assimp/assimp

Official Open Asset Import Library Repository. Loads 40+ 3D file formats into one unified and clean data structure.

Andrew Valleteau

@avallete

Hi there, anyone has been able to use the assimp_cli inside an AWS lambda instance ?

I've built the assimp binary with -DBUILD_SHARED_LIBS=OFF, extracted the compilation result from the /bin/ created an AWS layer from it. My issue is that anytime I try to use the export command from the cli using NodeJS child_process.execI get a SIGKILL error without any more details from the command.

If anyone has already been able to do something similar, I could really use some help.

Jerome St-Louis

@jerstlouis

@kimkulling buffer->Grow(length + padding); -- did I mess that up or is that just wrong ? Shouldn't this be buffer->Grow(offset + length) ?

Jerome St-Louis

@jerstlouis

I was behind on 5.0.1... will try master instead.

Jerome St-Louis

@jerstlouis

Is ExportData() (glTF2Export) supposed to keep adding things to the same buffer? Because Grow() takes the total size yet only the length for the current buffer view is passed... and the offset for that buffer view is set to offset = buffer->byteLength which means it's pointing to the current end of the buffer... Am I missing something?

https://github.com/assimp/assimp/blob/master/code/AssetLib/glTF2/glTF2Exporter.cpp#L387

Jerome St-Louis

@jerstlouis

also isn't the std::max( need, cur_size+(cur_size>>1) ) logic wrong for those buffers that actually get written to the file? there's a separate capacity from byte_length my bad.

Jerome St-Louis

@jerstlouis

I found my problem... sorry for all the noise. It was a 0 tex->mWidth which was causing a buffer view with 0 length. Was looking at the wrong spots. I need to get used to those .inl extensions, need to fix ourIDE to recognize that as source files...

Jerome St-Louis

@jerstlouis

I am really struggling here trying to get the alpha channel of my texture to work... Any tip?

I tried the alpha channel of diffuse, setting an extra opacity map, setting aiTextureFlags_UseAlpha on $tex.flags ...

Jerome St-Louis

@jerstlouis

AH I got it! $mat.gltf.alphaMode = "BLEND" has to be set...

turol

@turol

@kimkulling: yes, that would work

Jerome St-Louis

@jerstlouis

@kimkulling I have a proposed hackish fix for that slow glTF2 exporter performance I encountered:
assimp/assimp#3444

Jerome St-Louis

@jerstlouis

So the next big bottleneck is in MergeMesh(), where it tries to re-merge all meshes of a single node (even if they use different materials), which I had just separated because they use different materials, and assimp can only have a single material per mesh...

Kim Kulling

@kimkulling

thanks for you pull-reques. and yes the glTF stuff is hackish all over the place and needs a rework.

@turol I will start to provide the model data, I have still a lot of open issues from the fuzzer project on my list which are not entered unitl now.

dong

@dongfangliu

Hi, i have a question. Will the triangluate process also take the vertex skinning weight into account?

does anybody has some experience?

i mean, if my model is constructed with quads primitive and have skinning on that mesh, then i use assimp and triangulate it, will the codes also generate corresponding weights for those additional vertexs?

Kim Kulling

@kimkulling

good question, I think yes

Evilpudding

@EvilPudding

Hey, dunno if this is the right place to ask, but is there a way to prevent compiling and linking miniz without forking? I have a project that already uses miniz, and it has optional assimp integration, but when I try to statically link, I get lots of duplicated symbols. Is there some other way to encapsulate it either on my end or assimp's?

Kim Kulling

@kimkulling

Evilpudding

@EvilPudding

It seems there was an old issue richgel999/miniz#18 on the miniz repo that would fix it, maybe I should bother them instead.

aaaand it seems it was already addressed, sorry for the spam :|

Kim Kulling

@kimkulling

@turol could you take a look onto google/oss-fuzz#4566 I do not get it. works in my Linux

turol

@turol

$SRC is not set correctly for some reason

if you look at the command line, their -I is also wrong

-I/src/assimp/include

their build directory at least seems to be /home/runner/work/oss-fuzz/oss-fuzz/build/

Matthew Wallace

@matthewswallace_twitter

Hello all .... I have been exploring the idea of using assimp in an Oculus Quest application. To do this I would need to build from Unreal Engine to "basically Android" ... I have a working demo using windows and I'm able to load objects from an S3 bucket or the the file system just fine however, I'm not able to get this working on Android.

With in my Unreal Project all that it seems that I have to do is include the windows assimp dll in my binaries directory and I'm good to go.

All that being said is there somewhere that I can download the assimp binary that I would need in order to get this working or am I going to need to figure out how to build that myself for android?

José Ángel Martínez Torres

@joseangelmt

Hello to all,

I'm compiling the library to use it with Oculus Quest 2 headsets in a NativeActivity application.
My development machine is Windows and I'm using CMake UI to generate the build scripts.

I've to define ANDROID_ABI=arm64-v8a, change CMAKE_CXX_STANDARD_LIBRARIES to point to arm64-v8a versions of the libraries, and finally, uncheck ASSIMP_BUILD_TESTS.

Running ninja works fine with that configuration, but if I check ASSIMP_ANDROID_JNIIOSYSTEM, I get the next error:

C:\Users\josea\Desktop\assimp-master\build3>ninja
[3/4] Linking CXX shared library bin\libassimp.so
FAILED: bin/libassimp.so
cmd.exe /C "cd . && C:\Users\josea\AppData\Local\Android\Sdk\ndk\17.2.4988734\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=aarch64-none-linux-android --gcc-toolchain=C:/Users/josea/AppData/Local/Android/Sdk/ndk/17.2.4988734/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=C:/Users/josea/AppData/Local/Android/Sdk/ndk/17.2.4988734/sysroot -fPIC -fvisibility=hidden -fno-strict-aliasing -Wall -Wno-long-long -isystem C:/Users/josea/AppData/Local/Android/Sdk/ndk/17.2.4988734/sysroot/usr/include/aarch64-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11  -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a -nostdlib++ --sysroot C:/Users/josea/AppData/Local/Android/Sdk/ndk/17.2.4988734/platforms/android-21/arch-arm64 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -LC:/Users/josea/AppData/Local/Android/Sdk/ndk/17.2.4988734/sources/cxx-stl/llvm-libc++/libs/arm64-v8a -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libassimp.so -o bin\libassimp.so @CMakeFiles\assimp.rsp  && cd ."
port/AndroidJNI/libandroid_jniiosystem.a: error adding symbols: Archive has no index; run ranlib to add one
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Am I doing something wrong to include JNI support?
Thanks in advance.

Matthew Wallace

@matthewswallace_twitter

@joseangelmt Have you documented your process and how you set this up? I would really like to read some sort of blog post or watch a video of how you where able to get this far. If I run into the same issue maybe we can work through this together. I to have the same goal to get this working for Oculus Quest 2 headset.

Once that's working I would like to also get this working for iOS.

José Ángel Martínez Torres

@joseangelmt

Finally I compiled it with the script in scripts/android_crosscompile

@matthewswallace_twitter My plan is to create a blog showing how to deal with the native SDK

Matthew Wallace

@matthewswallace_twitter

@joseangelmt Awesome ... not to put any pressure on you, I'm wondering if that will be soon and if so will you keep me up to date when you post that? I'd like to collaborate with this community on getting this working for Android and iOS so that I can use this in my Unreal Engine project that I plan on packaging and shipping to both Android and iOS.

Kim Kulling

@kimkulling

would be great

I was able to compile it for android as well, but it was 2 years ago

Julian Vallée

@JulianVallee_gitlab

Hello everyone, I'm using Assimp with the C# bindings and I'm trying to manipulate meshes before applying post processing

For some reason my scenePointerAfterPP always returns as zero, but from what I understand it should return a valid pointer, no?

Julian Vallée

@JulianVallee_gitlab

I have documented my issue under assimp/assimp-net#65 now, better than dumping all that info into gitter I suppose

Matthew Wallace

@matthewswallace_twitter

I have assimp setup in Visual Studio 2019 on windows 10. Has anyone successfully added the ability to compile and build .so file for Android using Visual Studio? I'm looking for a good resource on how to compile the latest assimp 5 for android. like @joseangelmt I'd like to get this working for Android so I can use Assimp in Oculus Quest 2.

My other request would be ... If someone has successfully compiled and can share the .so file that will work for Oculus Quest 2, could you please share?

turol

@turol

i don't think visual studio can compile stuff for android

you need the android ndk and then build it with that

Matthew Wallace

@matthewswallace_twitter

VS does have an Android plugin for it. I'm not an Android Developer so I was hoping to find some help in this group compiling for mobile platforms.

Matthew Wallace

@matthewswallace_twitter

Well well ... I'm noticing that android studio allows you to add C++ projects to your android project. I'm guessing there may be a way to add assimp to the project and compile it via android studio?

Kim Kulling

@kimkulling

there are options via cmake

so I was able to build assimp for android by using gradle and cmake

Matthew Wallace

@matthewswallace_twitter

@kimkulling do you have a step by step on this? If not would you mind writing it up. It would be extremely helpful. Once I get it working on my end I'm happy to write up a more detailed tutorial, maybe even a video and post it in the wiki for everyone.

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