mirror of
https://github.com/JustinSDK/dotSCAD.git
synced 2025-01-17 14:18:13 +01:00
35 lines
1.4 KiB
Markdown
35 lines
1.4 KiB
Markdown
# stereographic_extrude
|
|
|
|
Takes a 2D polygon as input and extends it onto a sphere. If you light up a lamp on the north pole of the sphere, the shadow will return to the original 2D polygon. For more information, take a look at [Stereographic projection](https://en.wikipedia.org/wiki/Stereographic_projection).
|
|
|
|
The 2D polygon should center at the origin and you have to determine the side length of a square which can cover the 2D polygon. Because the 2D polygon will be extended onto a sphere, you can use `$fa`, `$fs` or `$fn` to controll the sphere resolution.
|
|
|
|
## Parameters
|
|
|
|
- `shadow_side_leng` : The side length of a square which can cover the 2D polygon.
|
|
- `$fa`, `$fs`, `$fn` : Check [the sphere module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#sphere) for more details.
|
|
|
|
|
|
## Examples
|
|
|
|
use <stereographic_extrude.scad>
|
|
|
|
dimension = 100;
|
|
|
|
stereographic_extrude(shadow_side_leng = dimension, convexity = 10)
|
|
text(
|
|
"M", size = dimension,
|
|
valign = "center",
|
|
halign = "center"
|
|
);
|
|
|
|
color("black")
|
|
text(
|
|
"M", size = dimension,
|
|
valign = "center",
|
|
halign = "center"
|
|
);
|
|
|
|
|
|
|
|
For more advanced examples, take a look at [my stereographic_projection collection](https://www.thingiverse.com/JustinSDK/collections/stereographic-projection). |