introduce script to generate assembly animation. still needs cleanup

rack/assembly/screwFeet.scad

@@ -0,0 +1,33 @@
+include <./common.scad>
+use <./insertFeet.scad>
+
+$vpt = [95,90,10];
+$vpr = [105,0,38];
+$vpd = 650;
+$vpf = 22.50;
+
+screwFeet(at=$t);
+
+module screwFeet(at=0,r=0) {
+
+  t = lerp(a=20, b=0, t=at);
+
+  function screwTrans(t=0) = translate(v=[-t - 9,0,connectorBottomToScrew]) * rotate(a=[0,-90,0]);
+  mirrorOtherFeetStackConnectorTrans = translate(v=[stackConnectorDx,0,0]) * mirror(v=[1,0,0]);
+
+
+  module screwToFeetModule() {
+    multmatrix(feetToYBarTrans(t = 0)*screwTrans(t = t))
+      caseScrewA();
+
+    multmatrix(feetToYBarTrans(t = 0)*mirrorOtherFeetStackConnectorTrans*screwTrans(t = t))
+      caseScrewA();
+  }
+
+  screwToFeetModule();
+
+  multmatrix(yBarMirrorOtherCornerTrans)
+    screwToFeetModule();
+
+  insertFeet(at=1,r=r);
+}