How to Resolve 'Cross-Origin Requests Are Only Supported for HTTP' Errors When Loading Local Files in Three.js?

Cross-Origin Error with Loading Local Files in Three.js

When loading local 3D models into Three.js using JSONLoader, developers may encounter the error "Cross origin requests are only supported for HTTP." This error occurs when conflicting origins are encountered.

In most cases, the underlying cause is that the file is loaded using either file:// or C:/, which are not considered HTTP origins. To resolve this issue, there are two common approaches:

1. Install a Local Webserver: Install a webserver on your local computer and host the model. This will make it accessible using an HTTP protocol, allowing Three.js to load it correctly.
2. Upload the Model to a Server: Upload the 3D model to a server and adjust the code to use an HTTPS or HTTP protocol URL to load the model. This approach eliminates the cross-origin issue as the origin matches the server's domain.

It's important to note that origin is defined by scheme, host, and port. Therefore, even if the file originates from the same host, the difference in scheme (e.g., http vs. file) results in them being treated as different origins. By using one of the mentioned approaches, you can resolve the cross-origin error and load your local 3D model into Three.js successfully.

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