Ok after some testing I noticed that the engine only crashes when the HDR picture size exceeds 10K … since the HDRI Backdrop actor reduced the image file to 8K anyway, I’ll just settle with importing 8K HDR files to unreal.
Since most of my HDR files are from HDRI Haven and downloaded in 16K, I’ll guess I’ll download them again in 8K or manually reducing the size in any image manipulation program.
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