fix old view data not deleting when loading a new citygml file

public/run_sax.js

@@ -336,9 +336,19 @@ function createViewInformation(gl, viewing) {
 
   gl.bindVertexArray(null);
 
+  clearViewing(gl);
   viewing.push(viewInformation);
 }
 
+function clearViewing(gl) {
+  for (var viewInfo in viewing) {
+    gl.deleteBuffer(viewInfo.posVbo);
+    gl.deleteBuffer(viewInfo.colorVbo);
+    gl.deleteBuffer(viewInfo.indexVbo);
+    gl.deleteVertexArray(viewInfo.vao);
+  }
+}
+
 function redraw(gl) {
   gl.clearBufferfv(gl.COLOR, 0, clearColor);
   gl.clearBufferfv(gl.DEPTH, 0, clearDepth);