R: Create, select or modify a subscene.

subscene3d {rgl} | R Documentation

## Create, select or modify a subscene.

### Description

This creates a new subscene, or selects one by `id` value, or adds objects to one.

### Usage

    newSubscene3d(viewport = "replace", projection = "replace", model = "replace",
               parent = currentSubscene3d(),
               copyLights = TRUE, copyShapes = FALSE, copyBBoxDeco = copyShapes,
               copyBackground = FALSE, newviewport,
               ignoreExtent)
    currentSubscene3d(dev = rgl.cur())
    useSubscene3d(subscene)
    addToSubscene3d(ids, subscene = currentSubscene3d())
    delFromSubscene3d(ids, subscene = currentSubscene3d())
    gc3d(protect = NULL)

### Arguments

`viewport, projection, model` | How should the new subscene be embedded? Possible values are `c("inherit", "modify", "replace")`. See Details below.
`parent` | The parent subscene (defaults to the current subscene).
`copyLights, copyShapes, copyBBoxDeco, copyBackground` | Whether lights, shapes, bounding box decorations and background should be copied to the new subscene.
`newviewport` | Optionally specify the new subscene's viewport (in pixels).
`ignoreExtent` | Whether to ignore the subscene's bounding box when calculating the parent bounding box. Defaults to `TRUE` if `model` is not `"inherit"`.
`dev` | Which rgl device to query for the current subscene.
`subscene` | Which subscene to use or modify.
`ids` | A vector of integer object ids to add to the subscene.
`protect` | Object ids to protect from this garbage collection.

### Details

The rgl package allows multiple windows to be open; each one corresponds to a “scene”. Within each scene there are one or more “subscenes”. Each subscene corresponds to a rectangular region in the window, and may have its own projection and transformation.

There is always a current subscene: most graphic operations make changes there, e.g. by adding an object to it.

The scene “owns” objects; `addToSubscene3d` and `delFromSubscene3d` put their ids into or remove them from the list being displayed within a particular subscene. The `gc3d` function deletes objects from the scene if they are not visible in any subscene, unless they are protected by having their id included in `protect`.

The `viewport`, `projection` and `model` parameters each have three possible settings: `c("inherit", "modify", "replace")`. `"inherit"` means that the corresponding value from the parent subscene will be used. `"replace"` means that the new subscene will have its own value of the value, independent of its parent. `"modify"` means that the child value will be applied first, and then the parent value will be applied. For viewport, this means that if the parent viewport is changed, the child will maintain its relative position. For the two matrices, `"modify"` is unlikely to give satisfactory results, but it is available for possible use.

The `viewport` parameter controls the rectangular region in which the subscene is displayed. It is specified using `newviewport` (in pixels relative to the whole window), or set to match the parent viewport.

The `projection` parameter controls settings corresponding to the observer. These include the field of view and the zoom; they also include the position of the observer relative to the model. The `par3d("projMatrix")` matrix is determined by the projection.

The `model` parameter controls settings corresponding to the model. Mouse rotations affect the model, as does scaling. The `par3d("modelMatrix")` matrix is determined by these as well as by the position of the observer (since OpenGL assumes that the observer is at (0, 0, 0) after the MODELVIEW transformation). Only those parts concerning the model are inherited when `model` specifies inheritance, the observer setting is controlled by `projection`.

If `copyBackground` is `TRUE`, the background of the newly created child will overwrite anything displayed in the parent subscene, regardless of depth.

### Value

If successful, each function returns the object id of the subscene, with the exception of `gc3d`, which returns the count of objects which have been deleted, and `useSubscene3d`, which returns the previously active subscene id.

### Author(s)

Duncan Murdoch and Fang He.

### See Also

`subsceneInfo` for information about a subscene, `mfrow3d` and `layout3d` to set up multiple panes of subscenes.

### Examples

    # Show the Earth with a cutout by using clipplanes in subscenes

    lat <- matrix(seq(90, -90, len = 50)*pi/180, 50, 50, byrow = TRUE)
    long <- matrix(seq(-180, 180, len = 50)*pi/180, 50, 50)

    r <- 6378.1 # radius of Earth in km
    x <- r*cos(lat)*cos(long)
    y <- r*cos(lat)*sin(long)
    z <- r*sin(lat)

    open3d()
    obj <- surface3d(x, y, z, col = "white",
           texture = system.file("textures/worldsmall.png", package = "rgl"),
           specular = "black", axes = FALSE, box = FALSE, xlab = "", ylab = "", zlab = "",
           normal_x = x, normal_y = y, normal_z = z)

    cols <- c(rep("chocolate4", 4), rep("burlywood1", 4), "darkgoldenrod1")
    rs <- c(6350, 5639, 4928.5, 4207, 3486,
                             (3486 + 2351)/2, 2351, (2351 + 1216)/2, 1216)
    for (i in seq_along(rs))
      obj <- c(obj, spheres3d(0, 0, col = cols[i], radius = rs[i]))

    root <- currentSubscene3d()

    newSubscene3d("inherit", "inherit", "inherit", copyShapes = TRUE, parent = root)
    clipplanes3d(1, 0, 0, 0)

    newSubscene3d("inherit", "inherit", "inherit", copyShapes = TRUE, parent = root)
    clipplanes3d(0, 1, 0, 0)

    newSubscene3d("inherit", "inherit", "inherit", copyShapes = TRUE, parent = root)
    clipplanes3d(0, 0, 1, 0)

    # Now delete the objects from the root subscene, to reveal the clipping planes
    useSubscene3d(root)
    delFromSubscene3d(obj)

[Package rgl version 0.99.9 Index]