76 3D: Views inside a Scene

9.3

Racket

76 3D: Views inside a Scene🔗ℹ

procedure
(view3d children
#:id id
[ #:center center
#:width width
#:height height
#:rotation rotation
#:scale scale
#:opacity opacity
#:camera camera
#:lights lights
#:background background
#:tone-map tone-map
#:render-mode render-mode
#:transparency-mode transparency-mode]) → view3d?
  children : (listof spatial-visual?)
  id : symbol?
  center : vec2? = origin
  width : positive-real? = 12
  height : positive-real? = 27/4
  rotation : finite-real? = 0
  scale : (or/c positive-real? vec2?) = 1
  opacity : (and/c real? (between/c 0 1)) = 1
  camera : camera3d? = (perspective-camera3d)
  lights : (listof light3d?) = null
  background : any/c = "white"
  tone-map : tone-map3d? = default-tone-map3d
  render-mode : (or/c 'wireframe 'opaque) = 'wireframe
   transparency-mode : (or/c 'object-sorted 'triangle-sorted)
= 'triangle-sorted

Creates the boundary between a normal two-dimensional Scene and a spatial tree. Its position, rotation, scale, opacity, and placement act as they do for other ordinary Visuals. 'wireframe retains the initial clipped-edge adapter. 'opaque uses a deterministic software triangle renderer: six-plane frustum clipping, CCW front-face culling (unless a material is double-sided), pixel-centre rasterization, and a z-buffer. An empty lights list uses a deterministic ambient-plus-directional default. Every explicit light ID must be distinct. Lights live in the view’s immutable frame state, not in its spatial tree. When material or effective spatial opacity is below one, transparent triangles are composited after the opaque depth-writing pass using the selected explicit sorting mode.

procedure
(view3d? value) → boolean?
value : any/c

Recognizes a 2D viewport Visual containing a spatial tree.

procedure
(view3d-children view) → (listof spatial-visual?)
view : view3d?

Returns direct spatial children.

procedure
(view3d-width view) → positive-real?
view : view3d?

Returns local 2D viewport width.

procedure
(view3d-height view) → positive-real?
view : view3d?

Returns local 2D viewport height.

procedure
(view3d-camera view) → camera3d?
view : view3d?

Returns the spatial camera.

procedure
(view3d-lights view) → list?
view : view3d?

Returns immutable light declarations.

procedure
(view3d-light-ref view id) → light3d?
view : view3d?
id : symbol?

Returns the unique authored light with id.

procedure
(view3d-light-replace view id replacement) → view3d?
  view : view3d?
  id : symbol?
  replacement : light3d?

Returns a view with one light replaced. replacement must retain id.

procedure
(view3d-light-update view id update) → view3d?
  view : view3d?
  id : symbol?
  update : procedure?

Applies an immutable same-ID update to one authored light.

procedure
(view3d-background view) → any/c
view : view3d?

Returns the opaque viewport background.

procedure
(view3d-tone-map view) → tone-map3d?
view : view3d?

Returns the immutable linear-light final output policy.

procedure
(view3d-render-mode view) → (or/c 'wireframe 'opaque)
view : view3d?

Returns the renderer mode.

procedure
(view3d-transparency-mode view)
→ (or/c 'object-sorted 'triangle-sorted)
view : view3d?

Returns its transparent-pass ordering policy.

procedure
(view3d-spatial-ref view path) → spatial-visual?
view : view3d?
path : spatial-path?

Resolves a path rooted with the outer view identity, such as '(world cube).

procedure
(view3d-spatial-has? view path) → boolean?
view : view3d?
path : any/c

Reports whether a rooted spatial path exists.

procedure
(view3d-spatial-replace view
path
replacement) → view3d?
  view : view3d?
  path : spatial-path?
  replacement : spatial-visual?

Returns a view with one same-identity descendant replaced.

procedure
(view3d-spatial-update view path update) → view3d?
  view : view3d?
  path : spatial-path?
  update : procedure?

Applies an immutable same-identity update to a descendant.

I	Concepts
II	Cookbook
III	Guide
IV	Complete Example Programs
V	Reference

52	Find a task or a name
53	Modules to require
54	Scenes and sampling
55	Scene states
56	Animation requests
57	Native model details
58	Visuals
59	Geometry
60	Number Lines and Coordinate Decorations
61	Point Markers, Scatter Plots, and Filled Areas
62	Probability and Statistical Diagrams
63	Calculus lessons
64	Colors
65	Slides
66	Slide command-line tools
67	Source Programs and Authored Timelines
68	Interactive Preview and Inspection
69	Preview controls and diagnostics
70	Projects and Final Rendering
71	Project execution and cache details
72	Pict Renderer Protocol
73	3D reference map
74	3D: Objects, groups, and paths
75	3D: Cameras and projection
76	3D: Views inside a Scene
77	3D: Animating 3D objects
78	3D: Animating the 3D camera
79	3D: Cuts, caps, and section measurements
80	3D: Supplementary surface, section, and annotation bindings
81	3D: Cuts, sections, and numerical volume
82	3D: Vectors
83	3D: Linear maps and rotations
84	3D: Affine transforms
85	3D: Bounds, rays, and planes
86	3D: Spatial maps and homotopies
87	3D: Materials and lights
88	3D: Lighting inspection
89	3D: Shadow descriptors and stable bounds
90	3D: Finite-light animation
91	3D: Software finite-light evaluation
92	3D: Colour space and final output
93	3D: Relations and geometric annotations
94	3D: Projected labels
95	3D: Textured billboards
96	3D: Spatial curves and vector diagrams
97	3D: Spatial anchors and label layout
98	3D: Anchors and projected labels
99	3D: Parametric surfaces and calculus
100	3D: Adaptive, trimmed, and implicit surfaces
101	3D: Constructive solids
102	3D: Surface constructors and queries
103	3D: Meshes
104	3D: Triangle topology
105	3D: Polygonal faces
106	3D: Deterministic convex hulls
107	3D: Polyhedral duals
108	3D: Schlegel diagrams and polyhedral nets
109	3D: Conservative mesh correspondence
110	3D: Topology-safe mesh matching
111	3D: Checking and repairing mesh orientation
112	3D: Clipping, sections, and transparency
113	3D: Prepared spatial ODE trajectories and vector fields
114	3D: Seeds and streamline sets
115	3D: Poincare sections and return maps
116	3D: Equilibria and local linearization
117	3D: Flow maps and volume change
118	3D: Drawing and inspecting trajectories
119	3D: Reading prepared trajectories
120	3D: Drawing vector fields and particles
121	3D: Trajectory display
122	3D: Spatial inspection and exact picking
123	3D: Retained renderer backends
124	3D: Compiled geometry and instances
125	3D: Frame requests and results
126	3D: Software rendering and statistics
127	3D: Optional Racket/ Open GL backend
128	Experimental Derived Visuals
129	Source Package Hygiene