openscad/NopSCADlib
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Added layer_height0 global variable and updated round_to_layer() to handle it.

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Moved functions from global_defs.scad to global.scad so they get documented.
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Chris
2022-09-25 18:22:29 +01:00
parent 87b794d4a2
commit 0f36c02b5e
3 changed files with 12 additions and 3 deletions
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4
global_defs.scad
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@@ -29,6 +29,7 @@ rr_green = [0, 146/255, 0]; // Rep
crimson = [220/255, 20/255, 60/255];
layer_height = is_undef($layer_height) ? 0.25 : $layer_height; // layer height when printing
layer_height0 = is_undef($layer_height0) ? layer_height : $layer_height0; // height of first layer if different
extrusion_width = is_undef($extrusion_width) ? 0.5 : $extrusion_width; // filament width when printing
nozzle = is_undef($nozzle) ? 0.45 : $nozzle; // 3D printer nozzle
cnc_bit_r = is_undef($cnc_bit_r) ? 1.2 : $cnc_bit_r; // minimum tool radius when milling 2D objects
@@ -51,10 +52,7 @@ eps = 1/128; // small fudge factor to stop CSG barfing on coincident faces.
$fa = 6;
$fs = extrusion_width / 2;
function round_to_layer(z) = ceil(z / layer_height) * layer_height; //! Round up to a multiple of layer_height.
// Some additional named colours
function grey(n) = [0.01, 0.01, 0.01] * n; //! Generate a shade of grey to pass to color().
silver = [0.75, 0.75, 0.75];
gold = [255, 215, 0] / 255;
brass = [255, 220, 100] / 255;

3
readme.md
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@@ -6918,6 +6918,7 @@ Original version by Doug Moen on the OpenSCAD forum
<a name="Global"></a>
## Global
Global constants, functions and modules. This file is used directly or indirectly in every scad file.
See [global_defs.scad](../../global_defs.scad) for a list of global constants.
[utils/core/global.scad](utils/core/global.scad) Implementation.
@@ -6930,6 +6931,7 @@ Global constants, functions and modules. This file is used directly or indirectl
| `cm(x)` | cm to mm conversion |
| `echoit(x)` | Echo expression and return it, useful for debugging |
| `foot(x)` | Foot to mm conversion |
| `grey(n)` | Generate a shade of grey to pass to color(). |
| `in(list, x)` | Returns true if `x` is an element in the `list` |
| `inch(x)` | Inch to mm conversion (For fractional inches, 'inch(1 + 7/8)' will work as expected.) |
| `limit(x, min, max)` | Force x in range min <= x <= max |
@@ -6938,6 +6940,7 @@ Global constants, functions and modules. This file is used directly or indirectl
| `no_point(str)` | Replace decimal point in string with 'p' |
| `r2sides(r)` | Replicates the OpenSCAD logic to calculate the number of sides from the radius |
| `r2sides4n(r)` | Round up the number of sides to a multiple of 4 to ensure points land on all axes |
| `round_to_layer(z)` | Round up to a layer boundary using `layer_height0` for the first layer and `layer_height` for subsequent layers. |
| `slice(list, start = 0, end = undef)` | Slice a list or string with Python type semantics |
| `sqr(x)` | Returns the square of `x` |
| `yard(x)` | Yard to mm conversion |

8
utils/core/global.scad
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@@ -19,6 +19,7 @@
//
//! Global constants, functions and modules. This file is used directly or indirectly in every scad file.
//! See [global_defs.scad](../../global_defs.scad) for a list of global constants.
//
include <../../global_defs.scad>
@@ -38,6 +39,13 @@ function r2sides(r) = $fn ? $fn : ceil(max(min(360/ $fa, r * 2 * PI / $fs), 5));
function r2sides4n(r) = floor((r2sides(r) + 3) / 4) * 4; //! Round up the number of sides to a multiple of 4 to ensure points land on all axes
function limit(x, min, max) = max(min(x, max), min); //! Force x in range min <= x <= max
function round_to_layer(z) = //! Round up to a layer boundary using `layer_height0` for the first layer and `layer_height` for subsequent layers.
z <= 0 ? 0 :
z <= layer_height0 ? layer_height0 :
ceil((z -layer_height0) / layer_height) * layer_height + layer_height0;
function grey(n) = [0.01, 0.01, 0.01] * n; //! Generate a shade of grey to pass to color().
module translate_z(z) //! Shortcut for Z only translations
translate([0, 0, z]) children();