introduce script to generate assembly animation. still needs cleanup

rack/assembly/connectXYTrayWithMainRails.scad

@@ -0,0 +1,47 @@
+include <./common.scad>
+use <./attachSideConnectorModulesToYBars.scad>
+
+$vpt = [96,110,70];
+$vpr = [68,0,36];
+$vpd = 700;
+$vpf = 22.50;
+
+connectXYTrayWithMainRails(at=$t);
+
+module connectXYTrayWithMainRails(at=0) {
+
+  attachSideConnectorModulesToYBars(at=1);
+
+  function mainRailTrans() =
+    yBarMainRailConnectorTrans;
+
+  module railAndScrew(at) {
+    t1 = lerp(a=12, b=0, t=min(1, 2*at));
+    t2 = lerp(a=16, b=0, t=max(0, 2*at - 1));
+
+    if (!plasticMask) {
+      translate(v=[0,0,t1])
+      mainRail();
+    }
+
+    if (at >= 1/2) {
+      multmatrix(
+        translate(v = [mainRailSlideHexOnYBarDx, mainRailSlideHexOnYBarDy, -5])*
+        rotate(a = [-45, 0, 0]))
+        translate(v = [0, 0, 14 + t2]) // length of caseScrewB
+          caseScrewB();
+    }
+  }
+
+  multmatrix(mainRailTrans())
+    railAndScrew(at=at);
+
+  multmatrix(yBarMirrorOtherCornerTrans * mainRailTrans())
+    railAndScrew(at=at);
+
+  multmatrix(xBarSpaceToYBarSpace * xBarMirrorOtherCornerTrans * yBarSpaceToXBarSpace * mainRailTrans())
+    railAndScrew(at=at);
+
+  multmatrix(xBarSpaceToYBarSpace * xBarMirrorOtherCornerTrans * yBarSpaceToXBarSpace * yBarMirrorOtherCornerTrans * mainRailTrans())
+    railAndScrew(at=at);
+}