Extend kangaroo example with context model

Loads 3dm as "context" which persists between solves

Author: pearswj

src/examples/bendy/context.3dm

@@ -79,6 +79,7 @@
     rhino = m
 
     init()
+    loadContext()
     compute()
 })
 
@@ -160,6 +161,15 @@
     animate()
 }
 
+function loadContext() {
+  loader.load('context.3dm', function (object) {
+    object.traverse(child => {
+      child.name = 'context'
+    })
+    scene.add(object)
+  })
+}
+
 /**
  * Call appserver
  */
@@ -241,7 +251,7 @@
 
         // clear objects from scene. do this here to avoid blink
         scene.traverse(child => {
-            if (!child.isLight) {
+            if (!child.isLight && child.name !== 'context') {
                 scene.remove(child)
             }
         })