# A3DCallbackProgressStart

type `A3DCallbackProgressStart`

  A callback function the library invokes as it prepares to perform a potentially time-consuming process.

  The argument identifies the processing phase, as follows:

  Processing phase | Description

  - 0 | Undefined.

  - 1 | Parsing the file

  - 2 | Writing file

  - 3 | Reading or building the model, which follows parsing the file (processing phase 1)

    > 2.0

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