I have a cross image,How to load this image in the viewer? I've tried these elements (cube cubestrip sphere cylinder flat fisheye),but none of them worked
such images are intentionally not supported. They are pure waste of resources and memory ;-).
50% of the image memory is not used. Using them directly is limited by the max. texture size of the system (e.g. on many system just 4096x4096). And re-processing/splitting the image into the cube-faces at runtime needs again a lot of memory and time.