Difference between revisions of "STEP X3D Translation"
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Methods for converting STEP (ISO 10303) exchange files to X3D files. Here we focus on direct translation; an alternative method will be to read import a STEP file into a full featured CAD program and then export either as X3D if avallable or export as VRML, then perform a VRML -> X3D translation. | Methods for converting STEP (ISO 10303) exchange files to X3D files. Here we focus on direct translation; an alternative method will be to read import a STEP file into a full featured CAD program and then export either as X3D if avallable or export as VRML, then perform a VRML -> X3D translation. | ||
===CADExchanger=== | ===CADExchanger=== | ||
| − | [http://cadexchanger.com | + | [http://cadexchanger.com CADExchanger] is a commercial product available for Windows and Mac OS that offers import and export for a number of formats [http://cadexchanger.com/products.html#formats]. At version 3.12 It offers import (and export) for STEP files and export for X3D. Conversion is by importing a STEP file and exporting as X3D. The developers also offer command-line products for bulk conversion, a software development kit, and development services. |
===Open Cascade and PythonOCC=== | ===Open Cascade and PythonOCC=== | ||
| + | [http://www.opencascade.com Open Casade] is an open source (LGPL) geometry kernel written in C++. [http://www.pythonocc.org PythonOCC] is a Python binding to the function exposed in compiled OpenCascade libraries, and so allows OpenCascade functions to be called from Python scripts. A simple Python script calling STEP import function followed by X3D export of the model: | ||
| + | |||
| + | <pre> | ||
| + | # Python script simplified from the example script | ||
| + | # core_load_step_ap203_to_x3d distributed with pythonOCC | ||
| + | input_file = 'm12_2.stp' # input STEP (AP203/AP214 file) | ||
| + | output_file = 'm12_2.x3d' # output X3D file | ||
| + | |||
| + | from OCC.STEPControl import STEPControl_Reader | ||
| + | from OCC.IFSelect import IFSelect_RetDone, IFSelect_ItemsByEntity | ||
| + | from OCC.Visualization import Tesselator, atNormal | ||
| + | step_reader = STEPControl_Reader() | ||
| + | status = step_reader.ReadFile( input_file ) | ||
| + | |||
| + | if status == IFSelect_RetDone: # check status | ||
| + | failsonly = False | ||
| + | step_reader.PrintCheckLoad(failsonly, IFSelect_ItemsByEntity) | ||
| + | step_reader.PrintCheckTransfer(failsonly, IFSelect_ItemsByEntity) | ||
| + | aResShape = step_reader.Shape(1) | ||
| + | else: | ||
| + | print("Error: can't read file.") | ||
| + | sys.exit(0) | ||
| + | |||
| + | Tesselator(aResShape).ExportShapeToX3D( output_file ) | ||
| + | </pre> | ||
===SPRI Server=== | ===SPRI Server=== | ||
| + | [http://spri.kshell.com SPRI] is a web application that allows browsing the content of STEP files. A STEP file can contain multiple geometric models and the web application allows for viewing what models are available in a file and selecting which are translated to X3C content. Preparing an X3D model requires these steps: | ||
| + | # Using the FORM element on the upload page, choose a local STEP file and submit it to the server. | ||
| + | # The page displayed on a successful upload will offer options for information views of the STEP file. The "assemblies" view is the most direct way to retrieve X3D translations. | ||
| + | # On the assemblies page choose which assembly to render. | ||
| + | # The rendering page will present an X3DOM view and also have links to download an X3D file and to view the X3D model with the Cobweb browser. | ||
Latest revision as of 16:05, 13 October 2016
STEP to X3D Translation
Methods for converting STEP (ISO 10303) exchange files to X3D files. Here we focus on direct translation; an alternative method will be to read import a STEP file into a full featured CAD program and then export either as X3D if avallable or export as VRML, then perform a VRML -> X3D translation.
CADExchanger
CADExchanger is a commercial product available for Windows and Mac OS that offers import and export for a number of formats [1]. At version 3.12 It offers import (and export) for STEP files and export for X3D. Conversion is by importing a STEP file and exporting as X3D. The developers also offer command-line products for bulk conversion, a software development kit, and development services.
Open Cascade and PythonOCC
Open Casade is an open source (LGPL) geometry kernel written in C++. PythonOCC is a Python binding to the function exposed in compiled OpenCascade libraries, and so allows OpenCascade functions to be called from Python scripts. A simple Python script calling STEP import function followed by X3D export of the model:
# Python script simplified from the example script
# core_load_step_ap203_to_x3d distributed with pythonOCC
input_file = 'm12_2.stp' # input STEP (AP203/AP214 file)
output_file = 'm12_2.x3d' # output X3D file
from OCC.STEPControl import STEPControl_Reader
from OCC.IFSelect import IFSelect_RetDone, IFSelect_ItemsByEntity
from OCC.Visualization import Tesselator, atNormal
step_reader = STEPControl_Reader()
status = step_reader.ReadFile( input_file )
if status == IFSelect_RetDone: # check status
failsonly = False
step_reader.PrintCheckLoad(failsonly, IFSelect_ItemsByEntity)
step_reader.PrintCheckTransfer(failsonly, IFSelect_ItemsByEntity)
aResShape = step_reader.Shape(1)
else:
print("Error: can't read file.")
sys.exit(0)
Tesselator(aResShape).ExportShapeToX3D( output_file )
SPRI Server
SPRI is a web application that allows browsing the content of STEP files. A STEP file can contain multiple geometric models and the web application allows for viewing what models are available in a file and selecting which are translated to X3C content. Preparing an X3D model requires these steps:
- Using the FORM element on the upload page, choose a local STEP file and submit it to the server.
- The page displayed on a successful upload will offer options for information views of the STEP file. The "assemblies" view is the most direct way to retrieve X3D translations.
- On the assemblies page choose which assembly to render.
- The rendering page will present an X3DOM view and also have links to download an X3D file and to view the X3D model with the Cobweb browser.
