fixed much stuff with bad usage of constructor mixed with virtual functions in gl stuff. added model loading with assimp.

data/mesh/small_atomic_bomb.scad

@@ -0,0 +1,45 @@
+$fn = 12;
+
+offset = 1.0;
+
+r_inner = 0.2;
+r_outer = 0.5;
+
+rotate([0,0,180]) {
+
+hull() {
+    // hull around the small base
+    translate([offset, 0, 0]) sphere(r_inner);
+
+    // and the thick head
+    sphere(r_outer);
+}
+
+pipe_len=0.3;
+translate([offset, 0, 0]) {
+    rotate([0,90,0]) cylinder(r=r_inner, pipe_len);
+}
+
+// fins
+w = 0.5;
+h = 0.8 * r_outer;
+
+difference() {
+    // fin
+    for (i=[0:4]) {
+        rotate([i*90,0,0]) {
+            translate([offset-w/2+pipe_len,0,-h/2]) {
+                hull() {
+                    cube([w,0.05,0.01], center=true);
+                    rotate([0,-5,0]) {
+                        cube([w-0.2,0.05,h+0.15], center=true);
+                    }
+                }
+            }
+        }
+    }
+
+    // cutout part near end of pipe
+    //translate([pipe_len+offset,0,0]) sphere(0.25);
+}
+}