step2x3d.py

#!/usr/bin/env python3

import sys
from OCC.Core.STEPControl import STEPControl_Reader
from OCC.Core.IFSelect import IFSelect_RetDone, IFSelect_ItemsByEntity
from OCC.Core import Tesselator

input_file  = sys.argv[1]
output_file = sys.argv[2]

step_reader = STEPControl_Reader()
status = step_reader.ReadFile(input_file)

print(status)

if status == IFSelect_RetDone:
	failsonly = False
	step_reader.PrintCheckLoad(failsonly, IFSelect_ItemsByEntity)
	step_reader.PrintCheckTransfer(failsonly, IFSelect_ItemsByEntity)
	print(step_reader.NbShapes())
	aResShape = step_reader.Shape(1)
else:
	print("Error: can't read file.")
	sys.exit(0)

Tesselator(aResShape).ExportShapeToX3D(output_file)