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Imported STLs and difference/intersection

BL
Bryan Lee
Sat, Sep 11, 2021 3:55 PM

Is it even possible to import an STL and difference or intersect it with a
cube?

I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse,
And it doesn't work.  in the most recent case, a dragon.

So I'm left with the question, does it work at all?
Am I missing a setting?
Are the models I'm importing too many polygons?
Is there a work around?

I've been using Blender to do the job, but I'd rather OpenSCAD it.

Openscad-nightly under Ubuntu.

Is it even possible to import an STL and difference or intersect it with a cube? I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse, And it doesn't work. in the most recent case, a dragon. So I'm left with the question, does it work at all? Am I missing a setting? Are the models I'm importing too many polygons? Is there a work around? I've been using Blender to do the job, but I'd rather OpenSCAD it. Openscad-nightly under Ubuntu.
NH
nop head
Sat, Sep 11, 2021 3:58 PM

It only works if the STL is manifold, very few on Thingiverse are. They
often have self intersections.

On Sat, 11 Sept 2021 at 16:56, Bryan Lee leebc11@acm.org wrote:

Is it even possible to import an STL and difference or intersect it with a
cube?

I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse,
And it doesn't work.  in the most recent case, a dragon.

So I'm left with the question, does it work at all?
Am I missing a setting?
Are the models I'm importing too many polygons?
Is there a work around?

I've been using Blender to do the job, but I'd rather OpenSCAD it.

Openscad-nightly under Ubuntu.


OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

It only works if the STL is manifold, very few on Thingiverse are. They often have self intersections. On Sat, 11 Sept 2021 at 16:56, Bryan Lee <leebc11@acm.org> wrote: > Is it even possible to import an STL and difference or intersect it with a > cube? > > I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse, > And it doesn't work. in the most recent case, a dragon. > > So I'm left with the question, does it work at all? > Am I missing a setting? > Are the models I'm importing too many polygons? > Is there a work around? > > I've been using Blender to do the job, but I'd rather OpenSCAD it. > > > > Openscad-nightly under Ubuntu. > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >
RW
Ray West
Sat, Sep 11, 2021 7:17 PM

As nop head says, but I've had some success by using meshlab (wish I
really understood that) to repair and reduce polygons, and then it is
possible to treat the stl as more or less any other polyhedron in
openscad. I've often added plinths, cut away artefacts, and stolen heads
from statues. If you want to post the link to the particular file, I may
be able to try it.

On 11/09/2021 16:55, Bryan Lee wrote:

Is it even possible to import an STL and difference or intersect it with a
cube?

I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse,
And it doesn't work.  in the most recent case, a dragon.

So I'm left with the question, does it work at all?
Am I missing a setting?
Are the models I'm importing too many polygons?
Is there a work around?

I've been using Blender to do the job, but I'd rather OpenSCAD it.

Openscad-nightly under Ubuntu.


OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

As nop head says, but I've had some success by using meshlab (wish I really understood that) to repair and reduce polygons, and then it is possible to treat the stl as more or less any other polyhedron in openscad. I've often added plinths, cut away artefacts, and stolen heads from statues. If you want to post the link to the particular file, I may be able to try it. On 11/09/2021 16:55, Bryan Lee wrote: > Is it even possible to import an STL and difference or intersect it with a > cube? > > I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse, > And it doesn't work. in the most recent case, a dragon. > > So I'm left with the question, does it work at all? > Am I missing a setting? > Are the models I'm importing too many polygons? > Is there a work around? > > I've been using Blender to do the job, but I'd rather OpenSCAD it. > > > > Openscad-nightly under Ubuntu. > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org
FH
Father Horton
Sat, Sep 11, 2021 7:57 PM

Meshmixer can also repair troublesome STLs.

On Sat, Sep 11, 2021 at 2:17 PM Ray West raywest@raywest.com wrote:

As nop head says, but I've had some success by using meshlab (wish I
really understood that) to repair and reduce polygons, and then it is
possible to treat the stl as more or less any other polyhedron in
openscad. I've often added plinths, cut away artefacts, and stolen heads
from statues. If you want to post the link to the particular file, I may
be able to try it.

On 11/09/2021 16:55, Bryan Lee wrote:

Is it even possible to import an STL and difference or intersect it with

a

cube?

I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse,
And it doesn't work.  in the most recent case, a dragon.

So I'm left with the question, does it work at all?
Am I missing a setting?
Are the models I'm importing too many polygons?
Is there a work around?

I've been using Blender to do the job, but I'd rather OpenSCAD it.

Openscad-nightly under Ubuntu.


OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org


OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

Meshmixer can also repair troublesome STLs. On Sat, Sep 11, 2021 at 2:17 PM Ray West <raywest@raywest.com> wrote: > As nop head says, but I've had some success by using meshlab (wish I > really understood that) to repair and reduce polygons, and then it is > possible to treat the stl as more or less any other polyhedron in > openscad. I've often added plinths, cut away artefacts, and stolen heads > from statues. If you want to post the link to the particular file, I may > be able to try it. > > > On 11/09/2021 16:55, Bryan Lee wrote: > > Is it even possible to import an STL and difference or intersect it with > a > > cube? > > > > I keep trying to use OpenSCAD to "chop" up complex STLs form thingiverse, > > And it doesn't work. in the most recent case, a dragon. > > > > So I'm left with the question, does it work at all? > > Am I missing a setting? > > Are the models I'm importing too many polygons? > > Is there a work around? > > > > I've been using Blender to do the job, but I'd rather OpenSCAD it. > > > > > > > > Openscad-nightly under Ubuntu. > > _______________________________________________ > > OpenSCAD mailing list > > To unsubscribe send an email to discuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >