Glossary

The words cseen uses, and what each means here. Alphabetical.

Term	Meaning
alpha	How see-through a surface is, from 0 to 1. Faces behind show through. See box and surface.
anchor	A point on an object that follows it when it moves. a.anchor([x, y, z]), used to attach arrows and links.
at	Where an object stands, as [x, y, z]. For solids and devices it is the centre of the base.
camera	What the scene is seen through: parallel (view: 'iso', { yaw, pitch }) or perspective (Camera.perspective). See coordinates and cameras.
chapter	A named step on a timeline, tl.chapter('move'), that a reader can jump to.
construction	A flat drawing made of parts that draw on, fill, turn and fade, for showing how a shape is made. new Construct(...). See Constructions.
device	A drawn object that can carry a screen: monitor, laptop, phone and so on. See the gallery.
fit	How the scene is framed. By default it refits to its contents each frame; fit: 'sphere' frames the bounding sphere, and tl.lockFit(s) fixes it for a whole timeline.
group	Nodes that move, turn and scale together. See group.
link	A curved arrow between two objects or anchors that follows them. A pulse can ride it.
node	Anything in a scene: a shape, a device, a label, a chart. Every node can be placed, animated and themed.
opacity	How visible a whole object is, from 0 to 1. Unlike alpha it fades the object and everything on it.
pack	A part of the library with its own import: devices, ui, charts, waves, optics, math, flow. The core has none. See packs.
part	One outline or text tag of a construction. Its draw, fill, spin, scale, dx, dy and op can be animated.
player	What mount returns: it plays, pauses and redraws a figure in the page.
reverse	reverse(anim) plays an animation backwards. Every tween needs a from.
role	A name for a colour that CSS decides: accent, ink, faint, warm, cool, s1 to s8. You never pass a hex colour, so every theme works. See theming.
screen point	scene.screen(p): where a point of the scene lands in the picture, to line up something on the page with the figure.
scene	The thing you build: a camera and a tree of nodes. It draws to SVG at any moment in time.
still	A scene drawn at one moment as a plain SVG string, with renderStill.
timeline	A list of animations played in order. A scene at time t is the scene with the timeline replayed to t, so it can be scrubbed.
tween	One animation of one or more properties of a node, over a duration, with an easing.
view	The camera of a scene: 'iso', 'front', 'side', 'top', { yaw, pitch } or a perspective camera.
x, y, z	Always right, into the scene, up. See coordinates.