Effects

This group covers the scene-wide realism passes over the 3D frame.

Sketch	What it shows
SceneDefocus	Depth of field on a 3D scene, defocused by its own depth buffer. A row of orbs is drawn into a render target, then `scene.combined(with: scene.depth, .defocus(...))` racks focus through them. Drag to rack focus by hand.
AmbientOcclusion	Screen-space ambient occlusion from the scene's own depth and normals. It adds the soft darkening in crevices and contact gaps that grounds a brightly lit scene.
ScreenSpaceReflections	Surfaces reflecting the scene around them. SSR is traced over the frame and shown on a ring of reflective spheres in different metal finishes.
RayTracedReflections	Metals mirroring the actual scene, off-screen geometry included and with none of SSR's streaks. Rough surfaces spread their rays for a glossy result, and there is a `reflectionBounces` parameter. Needs a ray-tracing GPU and an environment.
ContactShadows	The fine dark seam that seats an object on the surface it stands on.
Atmosphere	Fog as a cue for distance and height, and physical aerial perspective, both over one colonnade. Hold space to switch.
Volumes	A column of smoke drawn from a box of density samples, rising past a ball whose shadow cuts a shaft down through it. The `medium` parameter turns it to cloud, fire, ink, or a glowing nebula.
MotionBlur	The streak a real camera's open shutter leaves on something moving.
TemporalAA	Edges refined past MSAA by accumulating jittered frames.
SpecularAntialias	Highlights smaller than their pixel, held still instead of crawling.
Upscaling	The frame is rendered small and reconstructed at full size, which keeps the frame rate up.
FrameInterpolation	The sketch draws half as often, and a generated frame between each pair lets the display keep its rate.
LensFlare	The light a camera adds to a picture on its own.
PathTraced	Tune the scene live, then render the same frame offline with a path tracer.

Run one with swift run Example-3D-Effects-<Name>, for example swift run Example-3D-Effects-SceneDefocus.