The change (apart from nicer formatting) is that the cylinder going into the wheel is ends 1mm to the left.

HansOlsson · HansOlsson · commit 3e61128bc721 · 2025-12-10T13:27:07.000+01:00
Previously it looked as if it was in front of the wheel (when looking at the entire icon - in small scale it doesn't matter). The gradient-part was not changed. Split off from modelica#4711
diff --git a/Modelica/Mechanics/MultiBody/Visualizers/VoluminousWheel.mo b/Modelica/Mechanics/MultiBody/Visualizers/VoluminousWheel.mo
@@ -64,7 +64,12 @@ equation
         Polygon(lineColor = {64, 64, 64}, fillColor = {64, 64, 64}, fillPattern = FillPattern.Solid, points = {{1, 0}, {0.302, 15.68}, {-1.74, 30.614}, {-5.049, 44.383}, {-9.544, 56.568}, {-21.224, 73.91}, {-35, 80}, {-48.776, 73.91}, {-60.456, 56.568}, {-64.951, 44.383}, {-68.26, 30.614}, {-70.302, 15.68}, {-71, 0}, {-70.302, -15.68}, {-68.26, -30.614}, {-64.951, -44.383}, {-60.456, -56.568}, {-48.776, -73.91}, {-35, -80}, {-21.224, -73.91}, {-9.544, -56.568}, {-5.049, -44.383}, {-1.74, -30.614}, {0.302, -15.68}, {1, 0}}, smooth = Smooth.Bezier),
         Polygon(lineColor = {64, 64, 64}, fillColor = {191, 191, 191}, fillPattern = FillPattern.HorizontalCylinder, points = {{-12.5, 0}, {-14.213, -19.134}, {-19.09, -35.355}, {-26.39, -46.194}, {-35, -50}, {-43.61, -46.194}, {-50.91, -35.355}, {-55.787, -19.134}, {-57.5, 0}, {-55.787, 19.134}, {-50.91, 35.355}, {-43.61, 46.194}, {-35, 50}, {-26.39, 46.194}, {-19.09, 35.355}, {-14.213, 19.134}, {-12.5, 0}}, smooth = Smooth.Bezier),
         Text(textColor = {0,0,255}, extent = {{-150, 100}, {150, 140}}, textString = "%name"),
-        Rectangle(origin = {6.091, 0}, lineColor = {95, 95, 95}, fillColor = {215, 215, 215}, fillPattern = FillPattern.HorizontalCylinder, extent = {{-102.091, -8}, {-19.142, 8}})},
+        Rectangle(
+          origin={6.091,0},
+          lineColor={95,95,95},
+          fillColor={215,215,215},
+          fillPattern=FillPattern.HorizontalCylinder,
+          extent={{-103.091,-8},{-20.142,8}})},
       coordinateSystem(extent = {{-100, -100}, {100, 100}}, preserveAspectRatio = true)),
     Documentation(info = "<html>
 <p>
