How to change resource of 3D image with JS code?

Just set the "src" property of the 3D image widget to the graphic you want. You'll need to include the relative path, usually "app/resources/Uploaded/{image filename}". Here's an example:

$scope.changePic = function() {
 //use this form for the stock images
 //$scope.setWidgetProp("3DImage-1","src","app/resources/Default/vu_seq_pause.svg");
 // use this form for your own uploaded images
 $scope.setWidgetProp("3DImage-1","src","app/resources/Uploaded/myimage.png");
}