A proof-of-concept project, testing OpenSCAD / STEP files loading.
Forked to make some minor modifications to a few files to deal with API changes in opencascade > 7.2.
This compiled and worked correctly in October 2024 on archlinux 6.6.56-1-lts with opencascade 1:7.7.2-6.
I downgraded opencascade a little bit (from 1:7.8.1-2) because version 7.8 brought some TK library reorganization that is incompatible with the hardcoded Makefile.
In this forum post, Dmitrii links to this piece of documentation on how you should properly perform the upgrade/migration.
$ openscad-step-reader
A proof-of-concept program for STEP/OpenSCAD integration
usage: openscad-step-reader [options] INPUT.STEP
Output is written to STDOUT.
options are:
-h, --help this help screen
-V, --version version information
-o, --stl-occt convert the input STEP file into ASCII STL file
using OpenCASCADE code. This should be the baseline
when debugging/troubleshooting incorrect outputs.
-a, --stl-ascii convert the input STEP file into custom ASCII STL file,
using our code. This is a good test to check mesh
triangulation code. EXCEPT for the 'normal' values
which are not produced, the vertex values should be
equivalent to those with --stl-occt.
-s, --stl-scad convert the input STEP file into SCAD code, containing
a single 'polyhedron' call with the STL triangles stored
in SCAD vectors.
-f, --stl-faces convert the input STEP file into SCAD code, retaining the
'face' information from the STEP file. Each face will be rendered
in a different color in openscad $preview mode.
-e, --explore Work-in-progress code, used for development and exploration
of OpenCASCADE class hierarchy, e.g.
Shell->Face->Surface->Wire->Edge->Vertex.
produces debug messges and no useful output.
See the [examples] sub directory for STEP files and their STL/SCAD output.
e.g. the files in examples/box were created with:
openscad-step-reader --stl-ascii examples/box/box.stp > examples/box/box-ascii.stl
openscad-step-reader --stl-scad examples/box/box.stp > examples/box/box.scad
openscad-step-reader --stl-faces examples/box/box.stp > examples/box/box-faces.scad
The --explore option is a development tool to help learn
and understand the OpenCASCADE hierarchy class model (e.g.
shape->shell->face->surface->wire->edge->vertex).
$ openscad-step-reader --explore example/cylinder/cyl.stp
Shell 0
Face 0 Type = 1:Cylinder
Wire 0
edge 0
VertexFirst 2, -4.89859e-16, 10
VertexLast 2, -4.89859e-16, 10
edge 1
VertexFirst 2, -4.89859e-16, 0
VertexLast 2, -4.89859e-16, 10
edge 2
VertexFirst 2, -4.89859e-16, 0
VertexLast 2, -4.89859e-16, 0
edge 3
VertexFirst 2, -4.89859e-16, 0
VertexLast 2, -4.89859e-16, 10
Face 0 Type = 0:Plane
Wire 0
edge 0
VertexFirst 2, -4.89859e-16, 10
VertexLast 2, -4.89859e-16, 10
Face 0 Type = 0:Plane
Wire 0
edge 0
VertexFirst 2, -4.89859e-16, 0
VertexLast 2, -4.89859e-16, 0
The --stl-scad converts to STEP to triangles (just like an STL file),
then writes the triangles as openSCAD code:
$ openscad-step-reader --stl-scad example/box/box.stp
points = [
[0,10,0],[0,0,0],[0,0,10], // Triangle 1 / 12
[0,10,10],[0,10,0],[0,0,10],
[10,0,10],[10,0,0],[10,10,0],
[10,0,10],[10,10,0],[10,10,10],
[0,0,0],[10,0,0],[10,0,10],
[0,0,10],[0,0,0],[10,0,10],
[10,10,10],[10,10,0],[0,10,0],
[10,10,10],[0,10,0],[0,10,10],
[0,0,0],[0,10,0],[10,10,0],
[10,0,0],[0,0,0],[10,10,0], // Triangle 10 / 12
[10,10,10],[0,10,10],[0,0,10],
[10,10,10],[0,0,10],[10,0,10],
];
faces = [
[0,1,2], // Triangle 1 / 12
[3,4,5],
[6,7,8],
[9,10,11],
[12,13,14],
[15,16,17],
[18,19,20],
[21,22,23],
[24,25,26],
[27,28,29], // Triangle 10 / 12
[30,31,32],
[33,34,35],
];
module solid_object() {
polyhedron (points,faces);
}
solid_object();
Written by Assaf Gordon ([email protected]) License: LGPLv2.1 or later