Lumion loads a custom sky through the Real Skies effect in Photo, Movie and Panorama Mode, not in Build Mode. This page lists HDRI Hub's outdoor environments that work as Lumion skies, the exact steps to load one, and how to get a clean sun from an unclipped sky.
















































Try before you buy: the free HDRI samples need no account and carry the same licence as the paid files, so you can check the setup above with a real file before buying.
The effect is not available in Build Mode, only in Photo, Movie and Panorama Mode.
Lumion does not read OpenEXR files in the Real Skies effect. HDRI Hub skies up to HDR 141 and every sIBL set are delivered as Radiance .hdr and load directly. Skies from HDR 142 onwards are delivered as .exr and need a one-time conversion to .hdr before use in Lumion; Photoshop, Affinity Photo, Blender and ImageMagick all write .hdr from an .exr and keep the full dynamic range. The product page lists the delivered format of each sky. Details in .hdr or .exr. Parallax Interiors in recent Lumion versions accepts .exr, but that is a different feature.
Lumion's documentation does not publish a fixed pixel cap for Real Skies. For lighting and reflections only, 4096x2048 to 8192x4096 is enough. For a sky the camera sees directly, use 16000x8000 to 20000x10000 so cloud detail near the horizon stays sharp; since Lumion renders in real time, 8192x4096 to 10240x5120 is a practical working resolution for most scenes, with the largest files reserved for final still output.
Use one of HDRI Hub's 34 unclipped skies so the sun disc is intact and produces a sharp shadow edge once loaded as the Real Sky. Because the HDRI becomes the scene's main light source, no separate Lumion sun light is needed on top of it; the exterior HDR image with the horizon centred in the frame gives the most reliable result.
No. Lumion's documentation states that custom Real Skies must be .hdr. Convert an .exr sky to .hdr once, or pick a sky that HDRI Hub delivers as .hdr.
Custom Real Skies are loaded in Photo, Movie or Panorama Mode. Switch modes, add the Real Skies effect and the option appears.
No. The Real Sky becomes the main light. With an unclipped sky the sun disc casts a defined shadow; use the Real Skies sliders for brightness and rotation.
8192x4096 to 10240x5120 for everyday work; the 20000x10000 files only for final stills, since they cost GPU memory in real time.
More background: which HDRI resolution you need and .hdr or .exr.