Unneccessary global flag removed; 3d model added

3d_model/glass.svg

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="210mm"
+   height="297mm"
+   viewBox="0 0 210 297"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.4.3 (0d15f75, 2025-12-25)"
+   sodipodi:docname="glass.svg"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     inkscape:zoom="1.6186799"
+     inkscape:cx="396.6195"
+     inkscape:cy="561.25984"
+     inkscape:window-width="3840"
+     inkscape:window-height="2126"
+     inkscape:window-x="-11"
+     inkscape:window-y="-11"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1" />
+  <defs
+     id="defs1" />
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <circle
+       style="fill:none;stroke:#1a1a1a;stroke-width:0.0852361;stroke-linecap:round;stroke-miterlimit:10"
+       id="path1"
+       cx="83.717743"
+       cy="103.65941"
+       r="37.950001" />
+  </g>
+</svg>