Unable to set intensity and rotation of loaded IBL in desktop gltf_viewer

[haneulkimdev]

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Describe the bug
There is a bug where the intensity and rotation of the loaded IBL cannot be set in the desktop gltf_viewer after using the drag and drop feature.

To Reproduce
Steps to reproduce the behavior:

1. Load an IBL file using the drag and drop feature in the desktop gltf_viewer.
2. Attempt to set the intensity and rotation of the loaded IBL.

Expected behavior
The intensity and rotation of the loaded IBL should be adjustable from the desktop gltf_viewer GUI.

Screenshots
Not applicable.

Logs
Not applicable.

Desktop (please complete the following information):

• OS: Windows 11
• GPU: NVIDIA GTX 3050 Laptop
• Backend: Vulkan

Smartphone (please complete the following information):

• Device: Not applicable.
• OS: Not applicable.

Additional context
I have identified the issue and made some modifications to fix it. Here are the changes:

Proposed Fix

Here are the changes I made to fix the issue:

filamentApp.setDropHandler([&](std::string_view path) {
    utils::Path filename = getPathForGLTFAsset(path);
    if (!filename.isEmpty()) {
        if (checkGLTFAsset(filename)) {
            app.resourceLoader->asyncCancelLoad();
            app.resourceLoader->evictResourceData();
            app.viewer->removeAsset();
            app.assetLoader->destroyAsset(app.asset);
            loadAsset(filename);
            loadResources(filename);
            app.viewer->setAsset(app.asset, app.instance);
        }
        return;
    }

    filename = getPathForIBLAsset(path);
    if (!filename.isEmpty()) {
        FilamentApp::get().loadIBL(path);
        auto ibl = FilamentApp::get().getIBL();
        if (ibl) {
            app.viewer->setIndirectLight(ibl->getIndirectLight(), ibl->getSphericalHarmonics());
            app.viewer->getSettings().view.fogSettings.fogColorTexture = ibl->getFogTexture();
        }
        return;
    }
});

These changes ensure that the loaded IBL can have its intensity and rotation set in the desktop gltf_viewer.