0.1.0-alpha.6

A rig can be as big as a rig. The hundred-fixture ceiling is gone, inserting a
large structure takes seconds rather than five minutes, the floor is something
you can move or delete, and every number in the app is a value you drag rather
than a box you click at.

Several hundred moving heads

• The 100-mover ceiling is gone. MAX_INSTANCES was allocated once and
  never checked, so the hundred and first head wrote past every instanced
  buffer -- silently, because three drops an out-of-range write. Its count
  then exceeded the capacity, which degenerates the whole draw: every head
  vanished, leaving the selection box around nothing, and a second large
  structure took the renderer down. Capacity now doubles on demand.
• Lights live in a texture instead of a uniform array. three compiles every
  light into every lit fragment shader, and at 198 heads MeshStandardMaterial
  stopped linking outright -- a program that will not link draws nothing, which
  is why the bodies went while the unlit beam caps stayed. Light parameters are
  now read from a float texture, so the count is bounded by texture size rather
  than by uniform slots.
• Measured on a ring burner plus two 99-mover structures under live Art-Net:
  60 fps, 1.55 ms CPU and 3.0 ms GPU a frame, at 4K.

Inserting a structure

• Four minutes forty-five became seconds. Of 284,860 ms spent placing a
  115-member structure, the work itself -- every fixture built, named,
  addressed and patched -- was 48 ms. The rest was await handing control back
  to the renderer between members, and a frame mid-insert is not cheap. The
  profile cache the load path has always had now covers this path too, so the
  awaits resolve immediately and the loop runs to the end.

The floor is an object

• A plane in the show, not a cube in the renderer. It was a 50 x 50 x 0.5
  box bolted to the scene that nobody could move, resize, replace or delete and
  the item list never knew about. Existing shows are given one on load.
• The Floor checkbox in Visualizer settings is gone with it -- it existed to
  hide something you could not otherwise be rid of.
• Box selection ignores things bigger than the box. Overlapping still
  counts, so dragging across half a truss takes the heads it touches; an item
  larger than the band has to be enclosed. Without it every band drawn near the
  middle of the stage picked up the floor.

The grid

• Each decade fades by how big its cells are on screen, not by distance, so
  lines are gone before they can alias. Leaning in brings up a tenth of the
  unit; pulling back retires it. No setting to choose.
• Lines are measured properly now. fwidth() over-estimates by up to twice on
  a diagonal, so width varied with the angle a line made with the screen.
• Grid brightness and Grid line width are on the Visualizer panel.

Numbers

• Drag a number to change it. Right and up raise it, the wheel nudges it on
  hover, and Alt is the fine control on both. The pointer locks while
  dragging, so a long pull does not end at the edge of the screen. The up/down
  arrows are gone.
• No box until it is being typed into. A border around every number is most
  of what made a panel look like a form to fill in rather than values to work
  with.
• A field given a colour marks itself with a rule underneath -- the axis fields
  in the position tool.
• step is separate from precision. Position Z showed one decimal, so a
  step and the resolution were both 0.1, and Alt asked for 0.01 only to have
  the rounding put it back. Positions now drag in tenths and hold hundredths.
• Alt no longer opens the Windows menu bar. It resized the window under a
  locked pointer, arriving as a single 1159-pixel movement that threw a fixture
  across the room mid-drag.

Arrange

• Aim is an angle, and every shape aims the same way. Outward is zero from
  the radius, inward 180, along a line zero -- and ninety, which nothing could
  ask for before, is heads tangential to a circle or a row square to its line.
  Grids can be aimed at all now.
• Measured from the shape or from the world; from the world points a whole rig
  the same way wherever each fixture sits.
• Keep heading replaces Set heading and is off by default, so arranging a
  set aims it.

Selection and the modifier panel

• One guard for every kind. Three per-kind checks were hardened one at a
  time and the object one never was, so two selected speakers showed a
  single-object editor beside the multi-item one -- and nudging it dropped the
  other speaker out of the selection.
• Controls.detach drops the item it is handed rather than the whole
  selection. Every per-axis write goes through it, so nudging one item of a
  multi-selection silently dropped the rest.
• A selection can be typed into. Position moves its centre and keeps the
  spread; rotation swings it about its own centre. The fields hold a running
  total and apply the difference, which is what makes a value committed twice
  -- on Enter and again on blur -- turn 45 degrees rather than 90.
• Structure members are selectable again; the panel had been assigning to
  computed properties, which Vue refuses.

Objects

• Create object asks how many, and offsets copies as the fixture and
  structure paths do.
• A plane is single sided, so it works as a ceiling rather than hiding the
  room from any camera above it.
• Names follow the type until you have typed one.