R6 Class for binary buffers in glTF files.

These files typically have one buffer holding all the binary data for a scene.

Methods

Public methods

• Buffer$new()

• Buffer$load()

• Buffer$saveOpenBuffer()

• Buffer$getBuffer()

• Buffer$setBuffer()

• Buffer$openBuffer()

• Buffer$writeBuffer()

• Buffer$closeBuffer()

• Buffer$closeBuffers()

• Buffer$getBufferview()

• Buffer$addBufferView()

• Buffer$openBufferview()

• Buffer$setBufferview()

• Buffer$getAccessor()

• Buffer$setAccessor()

• Buffer$readAccessor()

• Buffer$readAccessor0()

• Buffer$addAccessor()

• Buffer$dataURI()

• Buffer$as.list()

• Buffer$clone()

---

Method new()

Usage

Buffer$new(json = NULL, binfile = NULL)

Arguments

json

list read from glTF file.

binfile

optional External binary filename, or raw vector

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Method load()

Load from file.

Usage

Buffer$load(uri, buf = 0)

Arguments

uri

Which file to load.

buf

Which buffer number to load.

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Method saveOpenBuffer()

Write open buffer to connection.

Usage

Buffer$saveOpenBuffer(con, buf = 0)

Arguments

con

Output connection.

buf

Buffer number.

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Method getBuffer()

Get buffer object.

Usage

Buffer$getBuffer(buf, default = list(byteLength = 0))

Arguments

buf

Buffer number.

default

Default buffer object if buf not found.

Returns

A list containing components described here: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#reference-buffer.

---

Method setBuffer()

Set buffer object.

Usage

Buffer$setBuffer(buf, buffer)

Arguments

buf

Buffer number.

buffer

New value to insert.

---

Method openBuffer()

Open a connection for the data in a buffer.

Usage

Buffer$openBuffer(buf)

Arguments

buf

Buffer number.

Returns

An open binary connection.

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Method writeBuffer()

Write data to buffer.

Usage

Buffer$writeBuffer(values, type, size, buf = 0)

Arguments

values

Values to write.

type

Type to write.

size

Byte size of each value.

buf

Which buffer to write to.

Returns

Byte offset of start of bytes written.

---

Method closeBuffer()

Close the connection in a buffer.

If there was a connection open, this will save the contents in the raw vector bytes within the buffer object.

Usage

Buffer$closeBuffer(buf)

Arguments

buf

The buffer number.

---

Method closeBuffers()

Close any open buffers.

Call this after working with a GLTF file to avoid warnings from R about closing unused connections.

Usage

Buffer$closeBuffers()

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Method getBufferview()

Get bufferView object.

Usage

Buffer$getBufferview(bufv)

Arguments

bufv

bufferView number.

Returns

A list containing components described here: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#reference-bufferview.

---

Method addBufferView()

Add a new buffer view.

Usage

Buffer$addBufferView(values, type, size, target = NULL, buf = 0)

Arguments

values

Values to put in the view.

type

Type of values.

size

Size of values in bytes.

target

Optional target use for values.

buf

Which buffer to write to.

Returns

New bufferView number.

---

Method openBufferview()

Open a connection to a buffer view.

Usage

Buffer$openBufferview(bufv)

Arguments

bufv

Which bufferView.

Returns

A connection.

---

Method setBufferview()

Set bufferView object.

Usage

Buffer$setBufferview(bufv, bufferView)

Arguments

bufv

bufferView number.

bufferView

New value to insert.

---

Method getAccessor()

Get accessor object

Usage

Buffer$getAccessor(acc)

Arguments

acc

Accessor number

Returns

A list containing components described here: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#reference-accessor

---

Method setAccessor()

Set accessor object.

Usage

Buffer$setAccessor(acc, accessor)

Arguments

acc

Accessor number.

accessor

New value to insert.

---

Method readAccessor()

Read data given by accessor number.

Usage

Buffer$readAccessor(acc)

Arguments

acc

Accessor number.

Returns

A vector or array as specified in the accessor. For the MATn types, the 3rd index indexes the element.

---

Method readAccessor0()

Read data given by accessor object.

Usage

Buffer$readAccessor0(accessor)

Arguments

accessor

Accessor object

Returns

A vector or array as specified in the accessor. For the MATn types, the 3rd index indexes the element.

---

Method addAccessor()

Write values to accessor, not including min and max.

Usage

Buffer$addAccessor(
  values,
  target = NULL,
  types = "anyGLTF",
  normalized = FALSE
)

Arguments

values

Values to write.

target

Optional target use for values.

types

Which types can be used?

normalized

Are normalized integers allowed?

useDouble

Whether to write doubles or singles.

Returns

New accessor number

---

Method dataURI()

Convert buffer to data URI.

Usage

Buffer$dataURI(buf = 0)

Arguments

buf

Buffer to convert.

Returns

String containing data URI.

---

Method as.list()

Convert to list.

Usage

Buffer$as.list()

Returns

List suitable for writing using JSON.

---

Method clone()

The objects of this class are cloneable with this method.

Usage

Buffer$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.