How To Use USD Importer

[y-nomoto340]

Hello
I want to use USD with assimp, but I have a question about how to do that.

When I looked at CMakeLists.txt, it seems that the USD build flag is turned off by default, so I turned it on from the command line.

cmake ../CMakeLists.txt -DASSIMP_BUILD_USD_IMPORTER=ON

CMakeLists.txt

# Experimental USD importer: disabled, need to opt-in
# Note: assimp github PR automatic checks will fail the PR due to compiler warnings in
# the external, 3rd party tinyusdz code which isn't technically part of the PR since it's
# auto-cloned during build; so MUST disable the feature or the PR will be rejected
option(ASSIMP_BUILD_USD_IMPORTER "Enable USD file import" off)
option(ASSIMP_BUILD_USD_VERBOSE_LOGS "Enable verbose USD import debug logging" off)
option(ASSIMP_BUILD_USE_CCACHE "Use ccache to speed up compilation." on)

I have Visual Studio 2022 installed.
When I tried to build using the following command, an error occurred at 6.

command

1. git clone https://github.com/assimp/assimp.git
2. cd assimp
3. mkdir build
4. cd build
5. cmake ../CMakeLists.txt -DASSIMP_BUILD_USD_IMPORTER=ON
6. cmake --build . --config Debug

log

C:\Users\y-nomoto\Documents\assimp\build>cmake ../CMakeLists.txt -DASSIMP_BUILD_USD_IMPORTER=ON
-- Selecting Windows SDK version 10.0.22621.0 to target Windows 10.0.19045.
-- Shared libraries enabled
-- compiling zlib from sources
****


**** Cloning tinyusdz repo, git tag 36f2aabb256b360365989c01a52f839a57dfe2a6


-- Use procesors : 12
**** Finished cloning tinyusdz repo
****
-- tinyusdz enabled
-- Enabled importer formats: AMF 3DS AC ASE ASSBIN B3D BVH COLLADA DXF CSM HMP IRRMESH IQM IRR LWO LWS MD2 MD3 MD5 MDC MDL NFF NDO OFF OBJ OGRE OPENGEX PLY MS3D COB BLEND IFC XGL FBX Q3D Q3BSP RAW SIB SMD STL TERRAGEN 3D USD X X3D GLTF 3MF MMD
-- Disabled importer formats:
-- Enabled exporter formats: OBJ OPENGEX PLY 3DS ASSBIN ASSXML COLLADA FBX STL X X3D GLTF 3MF PBRT ASSJSON STEP
-- Disabled exporter formats:
-- Treating all warnings as errors (for assimp library only)
CMake Warning (dev) at CMakeLists.txt:886 (ADD_CUSTOM_COMMAND):
  Exactly one of PRE_BUILD, PRE_LINK, or POST_BUILD must be given.  Assuming
  POST_BUILD to preserve backward compatibility.

  Policy CMP0175 is not set: add_custom_command() rejects invalid arguments.
  Run "cmake --help-policy CMP0175" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
This warning is for project developers.  Use -Wno-dev to suppress it.

...

-- Configuring done (0.9s)
-- Generating done (0.3s)
-- Build files have been written to: C:/Users/y-nomoto/Documents/assimp/build

log

C:\Users\y-nomoto\Documents\assimp\build>cmake --build . --config Debug
MSBuild version 17.11.9+a69bbaaf5 (.NET Framework)

  zlibstatic.vcxproj -> C:\Users\y-nomoto\Documents\assimp\build\contrib\zlib\Debug\zlibstaticd.lib
  USDLoaderImplTinyusdz.cpp

...

C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,7): error C2664: 'HA
NDLE CreateFileW(LPCWSTR,DWORD,DWORD,LPSECURITY_ATTRIBUTES,DWORD,DWORD,HANDLE)': cannot convert argument 1 from 'const
_Elem *' to 'LPCWSTR' [C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-build\tinyusdz_stati
c.vcxproj]
C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,7): error C2664:
     with [C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-build\tinyusdz_static.vcxproj]
C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,7): error C2664:
     [ [C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-build\tinyusdz_static.vcxproj]
C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,7): error C2664:
         _Elem=char [C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-build\tinyusdz_static.
vcxproj]
C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,7): error C2664:
     ] [C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-build\tinyusdz_static.vcxproj]
      C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,32):
      Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or parenthesized function-styl
  e cast
      C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\um\fileapi.h(92,1):
      see declaration of 'CreateFileW'
      C:\Users\y-nomoto\Documents\assimp\contrib\tinyusdz\autoclone\tinyusdz_repo-src\src\io-util.cc(158,7):
      while trying to match the argument list '(const _Elem *, unsigned long, int, nullptr, int, int, nullptr)'
          with
          [
              _Elem=char
          ]

Is there any solution?

[BrannonKing]

You have to include this in your configuration: -DASSIMP_WARNINGS_AS_ERRORS=OFF . tinyusdz doesn't compile without warnings, but assimp treats all warnings as errors by default.

[kimkulling]

Good point. I guess I need to try these warnings.