STP2X3D translates STEP (ISO 10303) Part 21 files (.stp / .step / .p21) and AP242 Domain Model XML (.stpx) to X3D (ISO/IEC 19776) (.x3d) or X3DOM (.html).

Originally developed at the National Institute of Standards and Technology (NIST), the software is based on the Open CASCADE STEP Processor and written in C++. Version 2.0 is maintained at Pusan National University.

• Open CASCADE Technology (OCCT) 8.0.0 or higher (recommended)
  • Rebuild OCCT for your toolchain; see the OCCT build guide.
  • Select vc14 or higher (x64) on Windows.
  • Typical DLL set required at runtime (names may vary slightly by OCCT build options):
    • OCCT: freetype.dll, jemalloc.dll (if JeMalloc is enabled), TKBO.dll, TKBRep.dll, TKCAF.dll, TKCDF.dll, TKDE.dll, TKDESTEP.dll, TKernel.dll, TKG2d.dll, TKG3d.dll, TKGeomAlgo.dll, TKGeomBase.dll, TKHLR.dll, TKLCAF.dll, TKMath.dll, TKMesh.dll, TKPrim.dll, TKService.dll, TKShHealing.dll, TKTopAlgo.dll, TKV3d.dll, TKVCAF.dll, TKXCAF.dll, TKXSBase.dll
    • VC++ runtime: msvcp140.dll, vcruntime140.dll (and vcruntime140_1.dll for newer MSVC toolsets)

• Use CMake 3.18 or higher.
  • Generator: Visual Studio with x64 (vc14 / MSVC 2015+ toolset).
• Set OCCT include/lib paths via environment variables, or edit the defaults in STP2X3D/CMakeLists.txt:
  • CSF_OCCTIncludePath — e.g. ...\OCCT-8_0_0\bin\inc
  • CSF_OCCTLibPath — e.g. ...\OCCT-8_0_0\bin\win64\vc14\lib
• Example from the repository root:

mkdir build
cd build
cmake ..
cmake --build . --config Release

• Use CMake 3.12.2 or higher.
• Point CSF_OCCTIncludePath / CSF_OCCTLibPath (or the defaults in STP2X3D/CMakeLists.txt) at your OCCT install.
• From the repository root:

mkdir build
cd build
cmake ..
make

STP2X3D is a command-line tool. See the Usage guide, or run the executable with no arguments to print options.

STP2X3D.exe --input Model.stp --edge 1 --quality 7
STP2X3D.exe --input Assembly.stpx --html 1

• Support for additional output formats (e.g. glTF)

• Soonjo Kwon, soonjo.kwon@pusan.ac.kr

• NIST STEP File Analyzer and Viewer

• R. R. Lipman, S. Kwon, 2021, STEP File Analyzer and Viewer User Guide (Update 7), NIST Advanced Manufacturing Series, 200-12.

2.0

This software originated at NIST. See the NIST Disclaimer and LICENSE.md for the original NIST terms of use.