STL export is too fastidious

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STL export is too fastidious

Henry Baker
Is there any way to get OpenSCAD to export STL that isn't a valid manifold ?

I don't want to 3D print it; I simply want to look at it using a better display tool.

Perhaps some sort of option in the Preferences that enables output of non-manifold objects.

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Re: STL export is too fastidious

kintel
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On 2013-06-29, at 08:58 , Henry Baker wrote:

> Is there any way to get OpenSCAD to export STL that isn't a valid manifold ?
>
This is a known issue: https://github.com/openscad/openscad/issues/337

 -Marius

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Re: STL export is too fastidious

nophead
Unless the object has been imported as an STL it should be pretty easy to make it manifold as a work around.


On 29 June 2013 16:58, Marius Kintel <[hidden email]> wrote:

On 2013-06-29, at 08:58 , Henry Baker wrote:

> Is there any way to get OpenSCAD to export STL that isn't a valid manifold ?
>
This is a known issue: https://github.com/openscad/openscad/issues/337

 -Marius

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Re: STL export is too fastidious

Henry Baker
Actually, it isn't going to be easy to make the object manifold.

In fact, I was trying to debug the object & was examining its pieces to try to better understand what was going on.

Unfortunately, the OpenSCAD viewer is not the greatest in the world, so I couldn't see very well what the problem was.

I had hoped to export the STL & examine the situation with another STL viewer, but sadly, that option isn't available.

At 09:29 AM 6/29/2013, nop head wrote:

>Unless the object has been imported as an STL it should be pretty easy to make it manifold as a work around.
>
>On 29 June 2013 16:58, Marius Kintel <[hidden email]> wrote:
>
>On 2013-06-29, at 08:58 , Henry Baker wrote:
>
>> Is there any way to get OpenSCAD to export STL that isn't a valid manifold ?
>>
>This is a known issue: https://github.com/openscad/openscad/issues/337
>
> -Marius

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Re: STL export is too fastidious

fukanchik
Henry,
On the other note, what feature do you think is missing from the openscad viewer?



On Sat, Jun 29, 2013 at 8:34 PM, Henry Baker <[hidden email]> wrote:
Actually, it isn't going to be easy to make the object manifold.

In fact, I was trying to debug the object & was examining its pieces to try to better understand what was going on.

Unfortunately, the OpenSCAD viewer is not the greatest in the world, so I couldn't see very well what the problem was.

I had hoped to export the STL & examine the situation with another STL viewer, but sadly, that option isn't available.

At 09:29 AM 6/29/2013, nop head wrote:
>Unless the object has been imported as an STL it should be pretty easy to make it manifold as a work around.
>
>On 29 June 2013 16:58, Marius Kintel <[hidden email]> wrote:
>
>On 2013-06-29, at 08:58 , Henry Baker wrote:
>
>> Is there any way to get OpenSCAD to export STL that isn't a valid manifold ?
>>
>This is a known issue: https://github.com/openscad/openscad/issues/337
>
> -Marius

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Re: STL export is too fastidious

Henry Baker
At 02:47 AM 6/30/2013, Sergey Fukanchik wrote:
>Henry,
>On the other note, what feature do you think is missing from the openscad viewer?

I've tried OpenSCAD on WinXP & on Win7, and on both of them I get really bad color renderings, with some green (?) showing through in some regions.  I find it nearly impossible to see what is going on.

The current objects I'm testing are basically graphical structures with 'nodes' and 'struts', and I'm trying to optimize the shape of the struts coming into the nodes.  Currently, the objects I'm testing (should) consist of 1 simple shell with no topological holes, but the objects aren't convex.  I am using the commands: polyhedron, hull, union, intersection, difference.

I might expect viewing problems with non-watertight objects, but the problems happen even on exportable objects.

I might be able to do a screen capture of some of the images so you can see what I'm dealing with.

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Re: STL export is too fastidious

Kevin Crowley
Those green areas I find to be incalculably valuable because they tell me where I need to make adjustments to remove them.  once they get removed I generally have a solid that i can send to anyone.

On Sun, Jun 30, 2013 at 8:00 AM, Henry Baker <[hidden email]> wrote:
At 02:47 AM 6/30/2013, Sergey Fukanchik wrote:
>Henry,
>On the other note, what feature do you think is missing from the openscad viewer?

I've tried OpenSCAD on WinXP & on Win7, and on both of them I get really bad color renderings, with some green (?) showing through in some regions.  I find it nearly impossible to see what is going on.

The current objects I'm testing are basically graphical structures with 'nodes' and 'struts', and I'm trying to optimize the shape of the struts coming into the nodes.  Currently, the objects I'm testing (should) consist of 1 simple shell with no topological holes, but the objects aren't convex.  I am using the commands: polyhedron, hull, union, intersection, difference.

I might expect viewing problems with non-watertight objects, but the problems happen even on exportable objects.

I might be able to do a screen capture of some of the images so you can see what I'm dealing with.

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Re: STL export is too fastidious

David Powell
with the F5 compile the green is the result of where you have done a difference() and it shows the portion of the object "cut away" by that 
you can override the default colours with the color command

example
color([0,0,0.9,1]) difference() ....  
to make the parts blue 


with the F6 render it will revert to default colours regardless as exports have no colour component in the file format anyway


On Sun, Jun 30, 2013 at 2:21 PM, Kevin Crowley <[hidden email]> wrote:
Those green areas I find to be incalculably valuable because they tell me where I need to make adjustments to remove them.  once they get removed I generally have a solid that i can send to anyone.


On Sun, Jun 30, 2013 at 8:00 AM, Henry Baker <[hidden email]> wrote:
At 02:47 AM 6/30/2013, Sergey Fukanchik wrote:
>Henry,
>On the other note, what feature do you think is missing from the openscad viewer?

I've tried OpenSCAD on WinXP & on Win7, and on both of them I get really bad color renderings, with some green (?) showing through in some regions.  I find it nearly impossible to see what is going on.

The current objects I'm testing are basically graphical structures with 'nodes' and 'struts', and I'm trying to optimize the shape of the struts coming into the nodes.  Currently, the objects I'm testing (should) consist of 1 simple shell with no topological holes, but the objects aren't convex.  I am using the commands: polyhedron, hull, union, intersection, difference.

I might expect viewing problems with non-watertight objects, but the problems happen even on exportable objects.

I might be able to do a screen capture of some of the images so you can see what I'm dealing with.

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Re: STL export is too fastidious

kintel
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In reply to this post by Henry Baker
On 2013-06-30, at 09:00 , Henry Baker wrote:

> I've tried OpenSCAD on WinXP & on Win7, and on both of them I get really bad color renderings, with some green (?) showing through in some regions.  I find it nearly impossible to see what is going on.
>
I'm not quite sure what you mean - and it sounds like others are confused as well. A screenshot would do wonders (less than 100KB please :)..

 -Marius

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Re: STL export is too fastidious

Peter Falke
If you post your code we will have a look at it, too.


On 30 June 2013 18:42, Marius Kintel <[hidden email]> wrote:
On 2013-06-30, at 09:00 , Henry Baker wrote:

> I've tried OpenSCAD on WinXP & on Win7, and on both of them I get really bad color renderings, with some green (?) showing through in some regions.  I find it nearly impossible to see what is going on.
>
I'm not quite sure what you mean - and it sounds like others are confused as well. A screenshot would do wonders (less than 100KB please :)..

 -Marius

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