introduce script to generate assembly animation. still needs cleanup

rack/assembly/slideHexNutsIntoYBar.scad

@@ -0,0 +1,52 @@
+include <./common.scad>
+
+$vpt = [43,66,41];
+$vpr = [44,0,47];
+$vpd = 350;
+$vpf = 22.50;
+
+slideHexNutsIntoYBar(at=$t);
+
+module slideHexNutsIntoYBar(at=0)
+{
+
+  t = lerp(a=20,b=0,t=at);
+
+  if (!plasticMask) {
+    yBar();
+  }
+
+  function sideModuleTrans(t=0) =
+      yBarSideModuleConnectorTrans *
+      translate(v = [yBarScrewHoleToOuterYEdge, yBarScrewHoleToFrontXEdge+t, -(4+sideWallConnLugDepression)]) *
+    rotate(a=[0,0,90]);
+
+  function mainRailTrans(t=0) =
+      yBarMainRailConnectorTrans *
+      translate(v = [mainRailSlideHexOnYBarDx+t, mainRailSlideHexOnYBarDy, -5]) *
+    rotate(a=[-45,0,0]);
+
+  function xBarTrans(t=0) =
+      translate(v = [-5, 27, 8+t]) *
+      yBarXBarConnectorTrans *
+    rotate(a=[0,90,0]);
+
+  module slideHexNutsOneCorner(t=0) {
+    multmatrix(sideModuleTrans(t = t))
+      hexNut(rackFrameScrewType);
+
+    multmatrix(mainRailTrans(t = t))
+      hexNut(rackFrameScrewType);
+
+    multmatrix(xBarTrans(t = t))
+      hexNut(rackFrameScrewType);
+  }
+
+  if (!screwMask) {
+    slideHexNutsOneCorner(t = t);
+
+    multmatrix(yBarMirrorOtherCornerTrans)
+      slideHexNutsOneCorner(t = t);
+  }
+
+}