somewhat off topic: turning a surface into a manifold
I scanned some mushrooms on a tree with a 3D scanner, so I have a
surface, but the object is not closed, solid, or manifold. Any tips
about how to take a surface and add structure to it behind to enable it
to be printed?
Thanks!
Jon
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Hi Jon,
I scanned some mushrooms on a tree with a 3D scanner, so I have a surface,
but the object is not closed, solid, or manifold. Any tips about how to
take a surface and add structure to it behind to enable it to be printed?
I am glad you ask.
(1) it will hurt.
(2) you may like my very experimental workaround.
Let's discuss your options first: Can your slicer deal with the 2d surface and generate a printed result? You would prefer that option.
Here is the idea: Most 3d scanners produce an STL. STL is a list of triangles in 3d space.
Your triangles are supposed to form a closed volume...
... which they aren't
... that is why you can't process the file with any tool.
If instead of using three coordinates to build a triangle...
... let us use three cubes on these coordinates to build a volume.
Run your STL through the attached script. It will generate an OpenSCAD-shape using translate() cube() and hull()
. You can render this shape to get a volume.
Depending on the amount of coordinates, it will take minutes to hours to render your scan. You will not be able to alter the camera angle in preview. You will not be able to zoom in preview.
That will convert your 2d surface area into a 3d volume, that can be handled by most tools. Since it is autogenerated, you cannot postprocess it in any meaningful way (too many coordinates).
If you find this 2d->3d conversion helpfull, you may like to add an additional center cube to hull() to get a closed volume.
Instructions:
In the file stl_to_polyhedron.py replace "zoe4.stl" with your STL-file name.
Run as
python3 stl_to_polyhedron.py >tree_with_mushrooms.scad
@mailinglist:
What is the correct call for a command line OpenSCAD to read a source file and auto generate an STL?
Cheers,
Marcus
Marcus:
Thank you. Where do I find Python3 to install, please. Is Python3 just
regular Python, or something different? I know nothing about Python.
Jon
On 9/15/2024 4:22 PM, Marcus Poller wrote:
Hi Jon,
I scanned some mushrooms on a tree with a 3D scanner, so I have a surface,
but the object is not closed, solid, or manifold. Any tips about how to
take a surface and add structure to it behind to enable it to be printed?
I am glad you ask.
(1) it will hurt.
(2) you may like my very experimental workaround.
Let's discuss your options first: Can your slicer deal with the 2d surface and generate a printed result? You would prefer that option.
Here is the idea: Most 3d scanners produce an STL. STL is a list of triangles in 3d space.
Your triangles are supposed to form a closed volume...
... which they aren't
... that is why you can't process the file with any tool.
If instead of using three coordinates to build a triangle...
... let us use three cubes on these coordinates to build a volume.
Run your STL through the attached script. It will generate an OpenSCAD-shape using translate() cube() and hull()
. You can render this shape to get a volume.
Depending on the amount of coordinates, it will take minutes to hours to render your scan. You will not be able to alter the camera angle in preview. You will not be able to zoom in preview.
That will convert your 2d surface area into a 3d volume, that can be handled by most tools. Since it is autogenerated, you cannot postprocess it in any meaningful way (too many coordinates).
If you find this 2d->3d conversion helpfull, you may like to add an additional center cube to hull() to get a closed volume.
Instructions:
In the file stl_to_polyhedron.py replace "zoe4.stl" with your STL-file name.
Run as
python3 stl_to_polyhedron.py >tree_with_mushrooms.scad
@mailinglist:
What is the correct call for a command line OpenSCAD to read a source file and auto generate an STL?
Cheers,
Marcus
Never mind. I found and installed Python, 3.126, from here:
https://www.python.org/downloads/release/python-3126/
After installation, typing "py" at a command line does not work. Typing
"python" brings me to the Microsoft Store. Typing "python3" brings me
top the MS store. Typing "python3.12" does not work. Typing
"python3.12.6" does not work.
On 9/15/2024 4:22 PM, Marcus Poller wrote:
Hi Jon,
I scanned some mushrooms on a tree with a 3D scanner, so I have a surface,
but the object is not closed, solid, or manifold. Any tips about how to
take a surface and add structure to it behind to enable it to be printed?
I am glad you ask.
(1) it will hurt.
(2) you may like my very experimental workaround.
Let's discuss your options first: Can your slicer deal with the 2d surface and generate a printed result? You would prefer that option.
Here is the idea: Most 3d scanners produce an STL. STL is a list of triangles in 3d space.
Your triangles are supposed to form a closed volume...
... which they aren't
... that is why you can't process the file with any tool.
If instead of using three coordinates to build a triangle...
... let us use three cubes on these coordinates to build a volume.
Run your STL through the attached script. It will generate an OpenSCAD-shape using translate() cube() and hull()
. You can render this shape to get a volume.
Depending on the amount of coordinates, it will take minutes to hours to render your scan. You will not be able to alter the camera angle in preview. You will not be able to zoom in preview.
That will convert your 2d surface area into a 3d volume, that can be handled by most tools. Since it is autogenerated, you cannot postprocess it in any meaningful way (too many coordinates).
If you find this 2d->3d conversion helpfull, you may like to add an additional center cube to hull() to get a closed volume.
Instructions:
In the file stl_to_polyhedron.py replace "zoe4.stl" with your STL-file name.
Run as
python3 stl_to_polyhedron.py >tree_with_mushrooms.scad
@mailinglist:
What is the correct call for a command line OpenSCAD to read a source file and auto generate an STL?
Cheers,
Marcus
Try googling how to add python to path
On Sun, Sep 15, 2024, 3:45 PM jon jonbondy.com via Discuss <
discuss@lists.openscad.org> wrote:
Never mind. I found and installed Python, 3.126, from here:
https://www.python.org/downloads/release/python-3126/
After installation, typing "py" at a command line does not work. Typing
"python" brings me to the Microsoft Store. Typing "python3" brings me
top the MS store. Typing "python3.12" does not work. Typing
"python3.12.6" does not work.
On 9/15/2024 4:22 PM, Marcus Poller wrote:
Hi Jon,
I scanned some mushrooms on a tree with a 3D scanner, so I have a
surface,
but the object is not closed, solid, or manifold. Any tips about how to
take a surface and add structure to it behind to enable it to be
printed?
I am glad you ask.
(1) it will hurt.
(2) you may like my very experimental workaround.
Let's discuss your options first: Can your slicer deal with the 2d
surface and generate a printed result? You would prefer that option.
Here is the idea: Most 3d scanners produce an STL. STL is a list of
triangles in 3d space.
Your triangles are supposed to form a closed volume...
... which they aren't
... that is why you can't process the file with any tool.
If instead of using three coordinates to build a triangle...
... let us use three cubes on these coordinates to build a volume.
Run your STL through the attached script. It will generate an
OpenSCAD-shape using translate() cube() and hull()
. You can render this shape to get a volume.
Depending on the amount of coordinates, it will take minutes to hours to
render your scan. You will not be able to alter the camera angle in
preview. You will not be able to zoom in preview.
That will convert your 2d surface area into a 3d volume, that can be
handled by most tools. Since it is autogenerated, you cannot postprocess it
in any meaningful way (too many coordinates).
If you find this 2d->3d conversion helpfull, you may like to add an
additional center cube to hull() to get a closed volume.
Instructions:
In the file stl_to_polyhedron.py replace "zoe4.stl" with your STL-file
name.
Run as
python3 stl_to_polyhedron.py >tree_with_mushrooms.scad
@mailinglist:
What is the correct call for a command line OpenSCAD to read a source
file and auto generate an STL?
Cheers,
Marcus
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Hi Jon,
Never mind. I found and installed Python, 3.126, from here:
After installation, typing "py" at a command line does not work.
I cannot support Python remotely, I do not support Windows at all.
I can offer: Send me your STL (preferably upload it and send me a download link) and I will process it for you.
Cheers,
Marcus