lithophane sphere with image
In Revar's img2tex example above, I thought it interesting enough to save
the image and pass it onto a geodesist I know. He asked some questions
about the world height exaggeration (which might make for some interesting
conversations), BUT it got me to thinking if we could overlay texture/color
maps like the USDA Plant Hardiness Zone Map <
https://planthardiness.ars.usda.gov/>, Level IV ecoregions <
https://www.epa.gov/eco-research/ecoregions>, and the like. There are
likely MUCH easier ways to do this, but you have me intrigued.
EBo --
On Tue, Mar 26, 2024 at 9:10 PM Sanjeev Prabhakar via Discuss <
discuss@lists.openscad.org> wrote:
May be something like this would be more interesting:
This is done finding the intersecting lines between a sphere a solid
you can download the file from here:
https://github.com/sprabhakar2006/openSCAD/blob/main/sphere_with_art.scad
[image: image.png]
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To unsubscribe send an email to discuss-leave@lists.openscad.org
Gábor, take a look at the background math on implementing Science on the
Sphere https://sos.noaa.gov/. If I recall correctly, you can take 4 or 5
images spaced 120 degrees apart, with the extra 2 being from above, and
possibly below (depending on the exact placement). So I think you need at
least a 4'th one to fully cover the sphere, depending on the full 3D
geometry.
On Tue, Mar 26, 2024 at 10:15 PM John David ebo.2112@gmail.com wrote:
In Revar's img2tex example above, I thought it interesting enough to save
the image and pass it onto a geodesist I know. He asked some questions
about the world height exaggeration (which might make for some interesting
conversations), BUT it got me to thinking if we could overlay texture/color
maps like the USDA Plant Hardiness Zone Map <
https://planthardiness.ars.usda.gov/>, Level IV ecoregions <
https://www.epa.gov/eco-research/ecoregions>, and the like. There are
likely MUCH easier ways to do this, but you have me intrigued.
EBo --
On Tue, Mar 26, 2024 at 9:10 PM Sanjeev Prabhakar via Discuss <
discuss@lists.openscad.org> wrote:
May be something like this would be more interesting:
This is done finding the intersecting lines between a sphere a solid
you can download the file from here:
https://github.com/sprabhakar2006/openSCAD/blob/main/sphere_with_art.scad
[image: image.png]
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Hello!
Yes, I want that!
I don't really understand the script either.
How do I find common points of intersection?
How do the 'p' points "emerge" in your script?
img2tex? img2scad? With a different procedure?
The output structure of img2tex is different than in your example,
moreover, it only has 2 decimal places. You are much more accurate.
I would like to place a flat graphic on a horizontal band of an empty
sphere, then highlight it by a few millimeters. Or in another version,
for the inner surface.
As you can see in the picture with the dog.
I did it with a lithophane maker, then called in 3 copies rotated by
120 degrees.
The rendering of this also took several hours, and then the gcode became huge.
MAYBE if I generate the model directly in Openscad, maybe the result
will be smaller and more manageable.
Sanjeev Prabhakar via Discuss discuss@lists.openscad.org ezt írta
(időpont: 2024. márc. 27., Sze, 2:10):
May be something like this would be more interesting:
This is done finding the intersecting lines between a sphere a solid
you can download the file from here:
https://github.com/sprabhakar2006/openSCAD/blob/main/sphere_with_art.scad
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
This is created using python language.
I have written functions which can find the intersection line between 2
intersecting solids.
You dont need to learn python but only basics would be required to create
shapes.
I am insisting here that python should be part of openscad, so that
separate software is not required.
Guenther has done some work on this, but it is not official yet it seems.
coming to the point of finding intersection line:
- 1st step is to create shapes with defined coordinate points in space and
not through openscad primitives. - once the shapes are defined with points in space, then there are a lot of
possibilities to manipulate these points.
example:
a cylinder is 2 circle placed one above another
[image: image.png]
a sphere is multiple circles with varying diameters which are placed one
above another and so on.
[image: image.png]
now to find intersection line between 2 solids say 's1' and 'c1' (for
sphere and cylinder respectively)
there is a function:
ip_sol2sol(s1,c1) => see magenta line in below fig.
[image: image.png]
I have written a lot of documentation on these processes and functions
which you can find here (In case you are interested):
https://github.com/sprabhakar2006/openSCAD/blob/main/explanation%20of%20approaches/examples_of_various_functions.pdf
On Wed, 27 Mar 2024 at 18:55, Gábor Magyar via Discuss <
discuss@lists.openscad.org> wrote:
Hello!
Yes, I want that!
I don't really understand the script either.
How do I find common points of intersection?
How do the 'p' points "emerge" in your script?
img2tex? img2scad? With a different procedure?
The output structure of img2tex is different than in your example,
moreover, it only has 2 decimal places. You are much more accurate.
I would like to place a flat graphic on a horizontal band of an empty
sphere, then highlight it by a few millimeters. Or in another version,
for the inner surface.
As you can see in the picture with the dog.
I did it with a lithophane maker, then called in 3 copies rotated by
120 degrees.
The rendering of this also took several hours, and then the gcode became
huge.
MAYBE if I generate the model directly in Openscad, maybe the result
will be smaller and more manageable.
Sanjeev Prabhakar via Discuss discuss@lists.openscad.org ezt írta
(időpont: 2024. márc. 27., Sze, 2:10):
May be something like this would be more interesting:
This is done finding the intersecting lines between a sphere a solid
you can download the file from here:
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
I have made a youtube video as to how to project a sketch on to a surface
On Wed, 27 Mar 2024 at 21:07, Sanjeev Prabhakar sprabhakar2006@gmail.com
wrote:
This is created using python language.
I have written functions which can find the intersection line between 2
intersecting solids.
You dont need to learn python but only basics would be required to create
shapes.
I am insisting here that python should be part of openscad, so that
separate software is not required.
Guenther has done some work on this, but it is not official yet it seems.
coming to the point of finding intersection line:
- 1st step is to create shapes with defined coordinate points in space and
not through openscad primitives. - once the shapes are defined with points in space, then there are a lot
of possibilities to manipulate these points.
example:
a cylinder is 2 circle placed one above another
[image: image.png]
a sphere is multiple circles with varying diameters which are placed one
above another and so on.
[image: image.png]
now to find intersection line between 2 solids say 's1' and 'c1' (for
sphere and cylinder respectively)
there is a function:
ip_sol2sol(s1,c1) => see magenta line in below fig.
[image: image.png]
I have written a lot of documentation on these processes and functions
which you can find here (In case you are interested):
On Wed, 27 Mar 2024 at 18:55, Gábor Magyar via Discuss <
discuss@lists.openscad.org> wrote:
Hello!
Yes, I want that!
I don't really understand the script either.
How do I find common points of intersection?
How do the 'p' points "emerge" in your script?
img2tex? img2scad? With a different procedure?
The output structure of img2tex is different than in your example,
moreover, it only has 2 decimal places. You are much more accurate.
I would like to place a flat graphic on a horizontal band of an empty
sphere, then highlight it by a few millimeters. Or in another version,
for the inner surface.
As you can see in the picture with the dog.
I did it with a lithophane maker, then called in 3 copies rotated by
120 degrees.
The rendering of this also took several hours, and then the gcode became
huge.
MAYBE if I generate the model directly in Openscad, maybe the result
will be smaller and more manageable.
Sanjeev Prabhakar via Discuss discuss@lists.openscad.org ezt írta
(időpont: 2024. márc. 27., Sze, 2:10):
May be something like this would be more interesting:
This is done finding the intersecting lines between a sphere a solid
you can download the file from here:
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
