Eight glTF props each wear a different Highlight outline - four solid colors, a dim 35% outline, a two-definition stack, an opacity pulse, and a hue cycle. The centre prop is bare. The front row is built in code rather than loaded, and is outlined the same way: a model and a primitive reach the one outline pass through a source system each. The outline is a neighbourhood test on the visibility buffer, so a highlighted thing is outlined only where it is actually visible - orbit until one passes behind another and watch the far outline get eaten. Drag to orbit · scroll to zoom.