Pick a place (latitude / longitude) and a date and time, and watch where the sun sits and how shadows fall across a massing. Real solar geometry (the NOAA solar-position algorithm) drives real cast shadows; a sun-path arc shows the whole day, and one click animates sunrise → sunset. Use a built-in massing or import your own model (STL / OBJ / PLY / 3DM), set the height, read altitude / azimuth / sunrise / sunset, and export a PNG.
Runs entirely in your browser — nothing is uploaded. Solar positions use the NOAA algorithm (accurate to about a minute); shadows are a real-time shadow map on a study massing, not a certified daylight simulation.