Loading Sequence in Three.js

Question

Loading Sequence in Three.js

I'm facing an issue with my Three.js Json-Loader. I have a set of objects whose paths are stored in an array. My goal is to load them and organize them into a list for easy selection. However, the order in which they load differs from their arrangement in the array because of varying sizes – smaller objects are loaded first and larger ones last. As a result, after loading them, I am unable to determine the name of the object (which is represented by its path).
Here's my current code:

for(var j=0;j<21;j++){
        var path = objPath[j];
        loader.load( path, function( geometry ) { save(geometry, path); } );
    }

As per this code snippet, the path passed to the save method always corresponds to the last path in the array (objPath[20]) due to the for-loop executing faster than the loading method itself. How can I ensure that the correct path is retained?

javascript three.js

Answer 1

Answer №1

One common mistake with JavaScript closure rules is causing you to be bitten by a specific issue. You can find more information on this topic at this link. Essentially, in order to ensure the correct path is passed to the save function, it is necessary to enclose it within a helper function factory. The code snippet below demonstrates how to achieve this:

function saveHelper(path) {
    return function(geometry) {
        save(geometry, path);
    }
}

for(var j=0;j<21;j++){
    var path = objPath[j];
    loader.load( path, saveHelper(path) );
}

Answer 2

One common mistake with JavaScript closure rules is causing you to be bitten by a specific issue. You can find more information on this topic at this link. Essentially, in order to ensure the correct path is passed to the save function, it is necessary to enclose it within a helper function factory. The code snippet below demonstrates how to achieve this:

function saveHelper(path) {
    return function(geometry) {
        save(geometry, path);
    }
}

for(var j=0;j<21;j++){
    var path = objPath[j];
    loader.load( path, saveHelper(path) );
}

Loading Sequence in Three.js

Answer №1

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