introduce script to generate assembly animation. still needs cleanup

rack/assembly/attachXBarWithYBar.scad

@@ -0,0 +1,29 @@
+include <./common.scad>
+use <./slideHexNutsIntoYBar.scad>
+
+$vpt = [116,90,18];
+$vpr = [56,0,42];
+$vpd = 550;
+$vpf = 22.50;
+
+attachXBarWithYBar(at=$t);
+
+module attachXBarWithYBar(at=0) {
+
+  t = lerp(a=20, b=0, t=at);
+
+  // assemble x-y bar trays
+  multmatrix(translate(v = [0, 0, t]))
+    slideHexNutsIntoYBar(at=1);
+
+  multmatrix(translate(v = [0, 0, t])*xBarSpaceToYBarSpace*xBarMirrorOtherCornerTrans*yBarSpaceToXBarSpace)
+    slideHexNutsIntoYBar(at=1);
+
+  if (!plasticMask) {
+    multmatrix(xBarSpaceToYBarSpace)
+      xBar();
+
+    multmatrix(yBarMirrorOtherCornerTrans*xBarSpaceToYBarSpace)
+      xBar();
+  }
+}