art director aaron garbut said that the addition of first-person inspired the enhanced version's graphical upgrade. remodelled cars feature interior effects including functional speedometers, fuel gauges and dashboard handbrake lights. the team added new particle and lighting effects, "like fireflies at night in the countryside, or ambient light pollution over los santos at night", according to garbut. "red dead redemption" inspired the team to add more vegetation to "break up the hard edges [and] straight lines" of the open world. the original version's vegetation was replaced with more detailed equivalents in the enhanced version. an upgraded weather system lets tree branches and leaves blow realistically in the wind. the team hand placed weeds along fences and walls, and placed grass over many of the open world's terrains. they then layered flowers, plants, stones, leaves and litter over the grass. an upgraded screen space ambient occlusion (ssao) system renders dynamic shadows that may cast through weather effects including volumetric fog, and particle effects including light reflections in water bodies or neon reflections in cars at night. the ambient light pollution over nighttime los santos may dissipate in poor weather. a dynamic depth of field system sharpens and softens images to emulate camera autofocus, and improved shaders produce new colours in skin and terrain textures.