Made pose() work on STL renders to match the documentation.

Change names of variables from `2a` and `2c` to `ax2` (a times 2) and
`cx2`, because variable names starting with a digit are deprecated in
OpenSCAD.

CHANGELOG.md

@@ -3,6 +3,16 @@
 This changelog is generated by `changelog.py` using manually added semantic version tags to classify commits as breaking changes, additions or fixes.
 
 
+#### [v21.35.4](https://github.com/nophead/NopSCADlib/releases/tag/v21.35.4 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v21.35.3...v21.35.4 "diff with v21.35.3")
+*   2025-03-23 [`fdbe0c7`](https://github.com/nophead/NopSCADlib/commit/fdbe0c7a9eba96823683b8e1161bc160bd63231e "show commit") [J.R.](# "Jeroen Roos") Change variable names that start with a digit
+
+ * Change names of variables from `2a` and `2c` to `ax2` (a times 2) and
+`cx2`, because variable names starting with a digit are deprecated in
+OpenSCAD.
+
+#### [v21.35.3](https://github.com/nophead/NopSCADlib/releases/tag/v21.35.3 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v21.35.2...v21.35.3 "diff with v21.35.2")
+*   2025-03-27 [`9f9aa67`](https://github.com/nophead/NopSCADlib/commit/9f9aa6723eff9b7439e17758406e9f8e409828ee "show commit") [C.P.](# "Chris Palmer") Third attempt to fix dimension image.
+
 #### [v21.35.2](https://github.com/nophead/NopSCADlib/releases/tag/v21.35.2 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v21.35.1...v21.35.2 "diff with v21.35.1")
 *   2025-03-27 [`6b6704b`](https://github.com/nophead/NopSCADlib/commit/6b6704b823291119697bf4993eddb3f2e6873875 "show commit") [C.P.](# "Chris Palmer") Second attempt to fix dimension image.
 

scripts/render.py

@@ -97,7 +97,7 @@ def render(target, type):
             render = "--preview" if type == 'stl' or colour != pp1 else "--render"
             tmp_name = tmp_dir + '/' + part[:-4] + '.png'
             dummy_deps_name = tmp_dir + '/tmp.deps' # work around for OpenSCAD issue #3879
-            openscad.run("-o", tmp_name, png_maker_name, colour_scheme, "--projection=p", image_size, cam, render, "--autocenter", "--viewall", "-d", dummy_deps_name)
+            openscad.run("-o", tmp_name, png_maker_name, colour_scheme, "--projection=p", image_size, cam, render, "-D$pose=1", "-D$explode=0", "--autocenter", "--viewall", "-d", dummy_deps_name)
             do_cmd(("magick "+ tmp_name + " -trim -resize 280x280 -background %s -gravity Center -extent 280x280 -bordercolor %s -border 10 %s"
                     % (background, background, tmp_name)).split())
             update_image(tmp_name, png_name)

utils/maths.scad

@@ -164,13 +164,13 @@ function xor(a,b) = (a && !b) || (!a && b);     //! Logical exclusive OR
 function cuberoot(x)= sign(x)*abs(x)^(1/3);
 
 function quadratic_real_roots(a, b, c) =        //! Returns real roots of a quadratic equation, biggest first. Returns empty list if no real roots
-    let(2a = 2 * a,
-        2c = 2 * c,
-        det = b^2 - 2a * 2c
+    let(ax2 = 2 * a,
+        cx2 = 2 * c,
+        det = b^2 - ax2 * cx2
     ) det < 0 ? [] :
         let(r = sqrt(det),
-            x1 = b < 0 ? 2c / (-b + r) : (-b - r) / 2a,
-            x2 = b < 0 ? (-b + r) / 2a : 2c / (-b - r)
+            x1 = b < 0 ? cx2 / (-b + r) : (-b - r) / ax2,
+            x2 = b < 0 ? (-b + r) / ax2 : cx2 / (-b - r)
         ) [x2, x1];
 
 function cubic_real_roots(a, b, c, d) = //! Returns real roots of cubic equation