assimp/assimp

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

Stephan Vedder

@feliwir

Hey, is there some up-to-date 3D Viewer that uses Assimp?

I only find open3mod which seems very outdated

Stephan Vedder

@feliwir

Also can i add "any" file to the non-BSD models? E.g. game files

(when writing a new importer for a fileformat)

Stephan Vedder

@feliwir

Hello?😅

Kim Kulling

@kimkulling

there is an internal viewer in the asset-importer-lib repo

Stephan Vedder

@feliwir

Great, thanks

Are there any criteria for file-formats that will be accepted?

Kim Kulling

@kimkulling

all which are currently supported by assimp

but it is a little bit outdated

the UI of the viewer

Stephan Vedder

@feliwir

I mean, i'm working on a new importer

For a new file-format

Kim Kulling

@kimkulling

which one?

Stephan Vedder

@feliwir

Westwood 3D

Used in Command & Conquer and some other Electronic Arts games

https://opensage.github.io/blog/blender-w3d-plugin-2018/

I'm one of the OpenSage developers (a project that reimplements the old game engine)

And i've done a Blender plugin for that fileformat and would like to contribute the format to Assimp aswell

Extension is .w3d

Here is a reference to the original game studio which used that format: https://en.wikipedia.org/wiki/Westwood_Studios

Stephan Vedder

@feliwir

@kimkulling would that be a format that can get accepted?

Kim Kulling

@kimkulling

if the code looks fine: yes

Stephan Vedder

@feliwir

Alright, yeah that's totally understandable. I'll probably open a Draft PR within the next few days so you can overlook it in an early state already

Stephan Vedder

@feliwir

Now i also want to redo assimp_view

Stephan Vedder

@feliwir

Weird. The 3ds max format is almost identical to the w3d format

Both chunk based and each chunk starts with flags & size

Stephan Vedder

@feliwir

@kimkulling my fileformat has a concept of multiple LODs per mesh, i can't find any way to fit that concept into Assimp

Am i missing something?

constructivetim

@constructivetim

Hey, is there some up-to-date 3D Viewer that uses Assimp?

I just found https://www.geeks3d.com/madview3d/ not sure if it is any good yet

Kim Kulling

@kimkulling

LODs are currently not supported

Stephan Vedder

@feliwir

@kimkulling so i should always just pick the highest res LOD i guess?

Kim Kulling

@kimkulling

yes, I think so

Joao Almgren

@joao-almgren

hi everyone - I have a very newb question so I apologize in advance... I don't see any "lib" directory, although the docs say there should be prebuilt windows binaries? I checked 5.0.0 and 5.0.1

Joao Almgren

@joao-almgren

nvm I will just build it myself, but it might be nice to update the docs if the binaries are not included in distros anymore

thanks for what looks like an awesome project :)

Kim Kulling

@kimkulling

hi, have you used the cmake build for that or what were your steps?

Joao Almgren

@joao-almgren

hi :) I used the "cmake tools for windows" component for visual studio to build

Kim Kulling

@kimkulling

the binaries shall be part of the distro again. at the moment time is rare to do this

sorry for that!

Joao Almgren

@joao-almgren

no worries, thank you! :)

Hill Ma

@mahiuchun_gitlab

question about this function: https://github.com/assimp/assimp/blob/master/code/Common/SpatialSort.cpp#L178

The value of 0x80000000 is specific to 32 bit float/int? so to make the code work similarly under ASSIMP_DOUBLE_PRECISION we'd replace the constant with something based on the size of int/float?

trosan

@trosan

Hi everyone! Sorry in advance in case this question is dumb. But I couldn't find the issue anywhere (I am writing my own importer): I have a png texture with an alpha channel - 255 means that the pixel is drawn; 0 means it is not drawn at all (should be transparent). Is it possible to define this in assimp so that e.g. blender automatically draws the texture transparent when I export the model to e.g. dae? At the moment it does not.

pitust

@pitust

i core dumped assimp like this:
$ assimp info jacky_driller_idle.glb -r
Launching asset import ... OK
Validating postprocessing flags ... OK
assimp: /build/assimp-gyXEzp/assimp-4.1.0~dfsg/code/../contrib/rapidjson/include/rapidjson/document.h:1209: rapidjson::GenericValue<Encoding, Allocator>::MemberIterator rapidjson::GenericValue<Encoding, Allocator>::FindMember(const rapidjson::GenericValue<Encoding, SourceAllocator>&) [with SourceAllocator = rapidjson::MemoryPoolAllocator<>; Encoding = rapidjson::UTF8<>; Allocator = rapidjson::MemoryPoolAllocator<>; rapidjson::GenericValue<Encoding, Allocator>::MemberIterator = rapidjson::GenericMemberIterator<false, rapidjson::UTF8<>, rapidjson::MemoryPoolAllocator<> >]: Assertion `IsObject()' failed.
Aborted (core dumped)
Why does this happen? It looks like some JSON stuff failed???

(i got this of system package manager)

pitust

@pitust

(also is there on latest release)

backtrace from GDB:

#0 GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51

#1 0x00007ffff5f9b801 in GI_abort () at abort.c:79

#2 0x00007ffff5f8b39a in assert_fail_base (fmt=0x7ffff61127d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7ffff77889ba "IsObject()", file=file@entry=0x7ffff7788900 "assimp/assimp/code/../contrib/rapidjson/include/rapidjson/document.h", line=line@entry=1214, function=function@entry=0x7ffff7789200 <rapidjson::GenericMember<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >* rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >::FindMember<rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> > const&)::PRETTY_FUNCTION> "rapidjson::GenericValue<Encoding, Allocator>::MemberIterator rapidjson::GenericValue<Encoding, Allocator>::FindMember(const rapidjson::GenericValue<Encoding, SourceAllocator>&) [with SourceAllocator ="...) at assert.c:92

#3 0x00007ffff5f8b412 in GI_assert_fail (assertion=0x7ffff77889ba "IsObject()", file=0x7ffff7788900 "assimp/assimp/code/../contrib/rapidjson/include/rapidjson/document.h", line=1214, function=0x7ffff7789200 <rapidjson::GenericMember<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >* rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >::FindMember<rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> > const&)::PRETTY_FUNCTION__> "rapidjson::GenericValue<Encoding, Allocator>::MemberIterator rapidjson::GenericValue<Encoding, Allocator>::FindMember(const rapidjson::GenericValue<Encoding, SourceAllocator>&) [with SourceAllocator ="...) at assert.c:101

#4 0x00007ffff758afd9 in rapidjson::GenericMember<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> > rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >::FindMember<rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> > const&) () from assimp/build/bin/libassimp.so.5

#5 0x00007ffff7580fed in rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >::FindMember(char const) () from assimp/build/bin/libassimp.so.5

#6 0x00007ffff75b6fe8 in bool glTF2::(anonymous namespace)::ReadMember<glTF2::PrimitiveMode>(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >&, char const, glTF2::PrimitiveMode&) () from assimp/build/bin/libassimp.so.5

#7 0x00007ffff75b5910 in glTF2::PrimitiveMode glTF2::(anonymous namespace)::MemberOrDefault<glTF2::PrimitiveMode>(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >&, char const, glTF2::PrimitiveMode) () from assimp/build/bin/libassimp.so.5

#8 0x00007ffff75baf21 in glTF2::Mesh::Read(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >&, glTF2::Asset&) () from assimp/build/bin/libassimp.so.5

#9 0x00007ffff75ca7c5 in glTF2::LazyDict<glTF2::Mesh>::Retrieve(unsigned int) () from assimp/build/bin/libassimp.so.5

#10 0x00007ffff75bc467 in glTF2::Node::Read(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >&, glTF2::Asset&) () from assimp/build/bin/libassimp.so.5

#11 0x00007ffff75c9d63 in glTF2::LazyDict<glTF2::Node>::Retrieve(unsigned int) () from assimp/build/bin/libassimp.so.5

#12 0x00007ffff75bc2f0 in glTF2::Node::Read(rapidjson::GenericValue<rapidjson::UTF8<char>, rapidjson::MemoryPoolAllocator<rapidjson::CrtAllocator> >&, glTF2::Asset&) () from assimp/build/bin/libassimp.so.5

#13 0x00007ffff75c9d63 in glTF2::LazyDi

Thomas Robin

@thomasrobin_gitlab

Hello !
I want to include assimp to my visual studio project. I use "Using the pre-built libraries with Visual-Studio" page.
But I'm stuck here : "you can simply use the pre-built linker libraries provided in the distribution [...] the assimp/lib/....."
I have not lib directory with the libs... I downloaded the latest release zip.
Someone can help me please ? :)

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