City Lights at Night - 8K True HDR Skyboxes (URP, HDRP)
Matei Ioan Alexandru
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10 seamless 8K night-city skyboxes with true HDR light: lamps up to 24x brighter than the sky. HDR, EXR, PNG, materials and a demo scene. Built-in, URP, HDRP.Unity 2022.3 LTS and newer. Built-in Render Pipeline and URP: skybox materials and demo scene. HDRP 14+: import the included HDRP/CityLightsAtNight_HDRP.unitypackage (Volume Profiles with HDRI Sky + HDRP demo scene).▶ 4K video showcase: https://youtu.be/otT5NoycxiENight skylines that actually light your scene.10 seamless 8K panoramas of modern cities after dark - rivers, harbours, marinas, canals and aerial views - stored as true HDR: street lamps, car lights and signs are up to 24× brighter than the sky, so they shine in reflections and light your scene instead of looking flat.Unity: drag a material into the Lighting window and you are done - in the Built-in Render Pipeline, URP and HDRP.✦ WHAT'S INSIDE• 10 HDR cubemaps - 8192 × 4096 .hdr, imported as cubemaps with 2048 px faces (the full 8K detail), BC6H HDR compression• 10 EXR + 10 PNG - the same panoramas as 16-bit half float EXR and 8K 8-bit PNG for your own tools and for mobile / WebGL• 10 skybox materials - Skybox/Cubemap, ready to use, rotation and exposure on the material• Demo scene - switch skies with 1-0 or the arrow keys, look around with the mouse, mirror / glossy / matte spheres• HDRP support package - 10 Volume Profiles (HDRI Sky) + an HDRP demo scene• Documentation - README and an illustrated PDF guideRiver Metropolis · Harbour Bay Blue Hour · Aerial Downtown · Lakefront Skyline · Aerial River Bend · Marina Towers · Aerial Desert Metropolis · Canal City · Aerial Coastal City Blue Hour · Bridge Crossing✦ TRUE HDR, NOT A STRETCHED PNG• Lamps, car lights, signs - up to 24× the brightness of the sky• Lit windows - about 6×, lit facades and light trails 1.6ו Everything else - exactly the values of the preview, so at exposure 1 the sky looks like the screenshots• Lower the exposure - the sky goes dark and the city lights stay bright, like a real night photo✦ WHAT YOU SEE IS WHAT YOU GET• In-engine screenshots - every sky picture is a capture from the included demo scene, 1920 × 1080 at a 70° field of view• 100% crop - a 1:1 crop of the 8K file is in the gallery, so you can judge the detail before you buy• Seamless - the left / right edge is checked on every panorama✦ DEMO CONTROLS• Mouse / W A S D - look around · Scroll zoom · Esc releases the cursor• 1-0 / Left / Right - change the sky · H spheres · Tab text• Any input setup - works with the old Input Manager and with the Input System package✦ RENDER PIPELINES• Built-in and URP - skybox materials + demo scene (the demo spheres use a small unlit shader that works in both)• HDRP 14+ - import HDRP/CityLightsAtNight_HDRP.unitypackage: Volume Profiles with HDRI Sky, fixed exposure that matches the previews, light bloom✦ USE CASESNight city backgrounds · racing and driving games · rooftop and balcony scenes · architectural visualization · VR · cinematics · reflections on cars and glassGood to know: the extra light range is rebuilt from the image (lamps, lit windows and facades), not captured with bracketed exposures - great for night highlights and reflections, not a measured light probe of a real place. Looking straight down, some panoramas are softer than at the horizon. Like any 8K panorama, a very narrow zoom on a 4K screen shows more pixels than the image has - a 60-90° field of view looks best.• 10 seamless equirectangular panoramas, 8192 × 4096 (2:1), 360° × 180°• 10 × .hdr (Radiance RGBE, linear, true HDR, max value 24) - imported as Cubemap, Latitude-Longitude, BC6H, 2048 px faces, mipmaps• 10 × .exr (16-bit half float, linear, same light range) - imported as 2D textures, Max Size 2048 (the source file stays 8K)• 10 × .png (8-bit sRGB, 8192 × 4096) - imported as 2D textures, Max Size 2048 (the source file stays 8K)• 10 skybox materials (Skybox/Cubemap)• 1 demo scene (Built-in RP and URP), 3 demo scripts (C#), 1 demo shader, 3 demo materials• HDRP support package: 10 Volume Profiles (Visual Environment, HDRI Sky, Exposure, Tonemapping, Bloom, Fog), 1 HDRP demo scene, 1 script, 3 HDRP/Lit materials• Documentation: README.txt, CityLightsAtNight_Guide.pdf• Unity 2022.3.11f1 or newer · Built-in · URP 14+ · HDRP 14+ · Linear color space recommended• No dependencies on other packages · download size about 1.2 GBThe 10 panoramas were generated with text-to-image diffusion models (FLUX.2 and Qwen-Image with 360-degree panorama LoRAs), run locally in ComfyUI, and then finished with my own image-processing tools: seamless wrap and pole repair, upscaling to 8192 x 4096, colour matching, and the HDR light range (street lamps, lit windows) rebuilt from the image into linear HDR and EXR files. The Unity setup scripts, demo scene scripts and documentation were written with the help of an AI coding assistant and tested in Unity Built-in, URP and HDRP.
