# A3DPDFEActivateWhen

enum `A3DPDFEActivateWhen`

  The circumstances under which the 3D Annot shall be activated.

  > 4.1

  ## Index

  Enumerators

  - `kA3DPDFActivExplicitActivation`
  - `kA3DPDFActivPageOpened`
  - `kA3DPDFActivPageVisible`

Enumerators

enumerator `kA3DPDFActivExplicitActivation`
  kA3DPDFActivExplicitActivation = `0`

  The 3D Annot shall remain inactive until explicitly activated by a script or user action.

enumerator `kA3DPDFActivPageOpened`
  kA3DPDFActivPageOpened

  The 3D Annot shall be activated as soon as the page containing the 3D Annot is opened.

enumerator `kA3DPDFActivPageVisible`
  kA3DPDFActivPageVisible

  The 3D Annot shall be activated as soon as any part of the page containing the 3D Annot becomes visible.

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