WARNING: Scaling a 2D object with 0 - removing object
I get the warning, "Scaling a 2D object with 0 - removing object" when first
running code like this:
linear_extrude(height=10,scale=[0.0,1.0])
square([10.0,10.0],center=true);
As far as I can tell, it's correctly generating what I'm expecting and
doesn't look like it has removed anything, but am I missing something?
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I pasted your code into the latest release, hit F5 and got the same error.
Changing the first scale vector to 1.0 turned it into a cube, but returning
the code to 0.0, F5 generated the triangle shape and no error. Erasing the
code, re-pasting it and F5 generated no error, but closing the program,
re-opening, re-pasting makes the error again.
There's something inherently wrong-feeling with a zero scaling factor,
though, isn't there?
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your first number in "scale" is zero. So it is doing a multiplication by
zero on that. Not sure what you are expecting
On Tue, May 21, 2019 at 10:22 AM kevfquinn co@kevquinn.com wrote:
I get the warning, "Scaling a 2D object with 0 - removing object" when
first
running code like this:
linear_extrude(height=10,scale=[0.0,1.0])
square([10.0,10.0],center=true);
As far as I can tell, it's correctly generating what I'm expecting and
doesn't look like it has removed anything, but am I missing something?
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That is a totally valid case in a linear extrude. If you apply this to a
square, you will get a wedge as a result
On Tue, 21 May 2019, 11:29 Dan Shriver, tabbydan@gmail.com wrote:
your first number in "scale" is zero. So it is doing a multiplication by
zero on that. Not sure what you are expecting
On Tue, May 21, 2019 at 10:22 AM kevfquinn co@kevquinn.com wrote:
I get the warning, "Scaling a 2D object with 0 - removing object" when
first
running code like this:
linear_extrude(height=10,scale=[0.0,1.0])
square([10.0,10.0],center=true);
As far as I can tell, it's correctly generating what I'm expecting and
doesn't look like it has removed anything, but am I missing something?
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I get the warning in my old version of OpenScad too. But it also renders a
wedge (suggesting the warning, at least in my version, happens every time
there is multiplication by zero; but that it does not necessarily really
remove the object). If both arguments are zero it renders a pyramid.
On Tue, May 21, 2019 at 11:38 AM A. Craig West acraigwest@gmail.com wrote:
That is a totally valid case in a linear extrude. If you apply this to a
square, you will get a wedge as a result
On Tue, 21 May 2019, 11:29 Dan Shriver, tabbydan@gmail.com wrote:
your first number in "scale" is zero. So it is doing a multiplication by
zero on that. Not sure what you are expecting
On Tue, May 21, 2019 at 10:22 AM kevfquinn co@kevquinn.com wrote:
I get the warning, "Scaling a 2D object with 0 - removing object" when
first
running code like this:
linear_extrude(height=10,scale=[0.0,1.0])
square([10.0,10.0],center=true);
As far as I can tell, it's correctly generating what I'm expecting and
doesn't look like it has removed anything, but am I missing something?
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On 21/05/2019 17:10, Dan Shriver wrote:
I get the warning in my old version of OpenScad too. But it also
renders a wedge (suggesting the warning, at least in my version,
happens every time there is multiplication by zero; but that it does
not necessarily really remove the object). If both arguments are
zero it renders a pyramid.
The "scale" value is causing the original square to be turned into a
degenerate line in the [0, 1] case or a point for [0, 0].
For a system that's intended for modelling 3D, I'm not entirely
surprised that it's complaining about the resulting 2D and 1D "objects".
Ray
It is by far the simplest way to generate wedges and cubes, though,
and there is no actual 1D or 2D object, they are just a vertex or edge
of the final 3D object, which are both valid.
On Tue, May 21, 2019 at 12:25 PM openscad@ray.bellis.me.uk wrote:
On 21/05/2019 17:10, Dan Shriver wrote:
I get the warning in my old version of OpenScad too. But it also
renders a wedge (suggesting the warning, at least in my version,
happens every time there is multiplication by zero; but that it does
not necessarily really remove the object). If both arguments are
zero it renders a pyramid.
The "scale" value is causing the original square to be turned into a
degenerate line in the [0, 1] case or a point for [0, 0].
For a system that's intended for modelling 3D, I'm not entirely
surprised that it's complaining about the resulting 2D and 1D "objects".
Ray
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On 21/05/2019 17:32, A. Craig West wrote:
It is by far the simplest way to generate wedges and cubes, though,
and there is no actual 1D or 2D object, they are just a vertex or edge
of the final 3D object, which are both valid.
They might look like just a vertex or edge, but unless OpenSCAD has
smarts I don't know about, aren't they actually four vertices (or two
edges) occupying the same location(s).
Specifying e.g. 0.001 as the scale factor should produce something
that's physically identical, but without the degeneration to 2D or 1D.
Ray
I'm expecting the square to scale to a line, on the understanding that the
source code is an "ideal" mathematical expression of the shape.
In other words I'm expecting it to be identical to:
linear_extrude(height=10.0)
polygon([[-5,0],[5,0],[0,10]]);
(bar the rotation).
DanS wrote
your first number in "scale" is zero. So it is doing a multiplication by
zero on that. Not sure what you are expecting
On Tue, May 21, 2019 at 10:22 AM kevfquinn <
co@
> wrote:
I get the warning, "Scaling a 2D object with 0 - removing object" when
first
running code like this:
linear_extrude(height=10,scale=[0.0,1.0])
square([10.0,10.0],center=true);
As far as I can tell, it's correctly generating what I'm expecting and
doesn't look like it has removed anything, but am I missing something?
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I'm assuming the processing that issues the warning becomes cached, so the
warning only appears the first time. I think that makes sense for warnings
(which don't prevent processing from completing successfully).
fred_dot_u wrote
I pasted your code into the latest release, hit F5 and got the same error.
Changing the first scale vector to 1.0 turned it into a cube, but
returning
the code to 0.0, F5 generated the triangle shape and no error. Erasing the
code, re-pasting it and F5 generated no error, but closing the program,
re-opening, re-pasting makes the error again.
There's something inherently wrong-feeling with a zero scaling factor,
though, isn't there?
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