R6 Class - Generate Data Cube Geometry via 3D Volume Texture

Volumetric data cube geometry rendered via a 3D texture lookup. Extends DataCubeGeom with four-channel color map support and opacity thresholding.

Author

Zhengjia Wang

Super classes

AbstractGeom -> DataCubeGeom -> DataCubeGeom2

Public fields

type

Geometry type string ("datacube2").

clickable

Logical; always FALSE for volume geometry.

threshold

Opacity threshold: voxel values below this level are rendered as transparent. Default 0.6.

color_format

WebGL texture format string; either "RGBAFormat" or "RedFormat".

color_map

Named list describing the four-channel color map applied to the volume, or NULL.

trans_space_from

Coordinate space of the input data before applying the transformation matrix; either "model" (default) or "scannerRAS".

Active bindings

is_datacube2

Logical flag; always TRUE for DataCubeGeom2 instances.

Methods

Public methods

• DataCubeGeom2$new()

• DataCubeGeom2$to_list()

• DataCubeGeom2$clone()

Inherited methods

• AbstractGeom$animation_time_range()
• AbstractGeom$animation_value_names()
• AbstractGeom$animation_value_range()
• AbstractGeom$set_position()
• DataCubeGeom$get_data()
• DataCubeGeom$set_value()

---

DataCubeGeom2$new()

Create a new data cube geometry using a 3D texture.

Usage

DataCubeGeom2$new(
  name,
  value,
  dim = dim(value),
  half_size = c(128, 128, 128),
  group = GeomGroup$new(name = "default"),
  position = c(0, 0, 0),
  color_format = c("RGBAFormat", "RedFormat"),
  cache_file = NULL,
  layer = 8,
  digest = TRUE,
  ...
)

Arguments

name

Unique character name.

value

Integer vector of voxel values (0-255).

dim

Integer vector of length 3: dimensions of the volume.

half_size

Numeric vector of length 3: half-extents of the bounding box in world-space units. Default c(128, 128, 128).

group

GeomGroup used to store the voxel data.

position

Numeric vector of length 3: geometry origin.

color_format

WebGL texture format: "RGBAFormat" (default) or "RedFormat".

cache_file

Path to a JSON cache file, TRUE for a temporary file, or NULL to keep data in memory.

layer

Camera layer. Default 8 (main camera only).

digest

Logical; compute a content digest for cache validation.

...

Additional arguments forwarded to DataCubeGeom.

---

DataCubeGeom2$to_list()

Serialize the texture data cube geometry to a named list for JSON export, adding threshold, color_format, color_map, isDataCube2, and trans_space_from.

Usage

DataCubeGeom2$to_list()

---

DataCubeGeom2$clone()

The objects of this class are cloneable with this method.

Usage

DataCubeGeom2$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.