Is it possible to modify the source code of SH3D to "hide" the 3D ground in order to use an HDRI image in a spherical sky?
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EnkoNyito
The Sunflow interface is not convenient for viewing scene changes.
Blender accepts the .hdr format, you could better place a 3D object so that it fits into a real image. Maybe one day Sweet Home 3D will also accept this image format.
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EnkoNyito