View source for QTM:GetHeadtrackingInfo

=Request=
{| class="wikitable" border="1"
|-
!  Index Word
!  Description
|-
| 0
| Header code [0x00020080]
|-
| 1-2
| u64, normally zero
|}

=Response=
{| class="wikitable" border="1"
|-
!  Index Word
!  Description
|-
| 0
| Header code
|-
| 1
| Result code
|-
| 2..17
| Output structure
|}

=Structure=
{| class="wikitable" border="1"
|-
!  Offset
!  Size
!  Description
|-
| 0x0
| 0x4
| u8 flags which indicate whether the head was detected.
|-
| 0x4
| 0x1
| u8 flag, unknown
|-
| 0x5
| 0x3
| Padding
|-
| 0x8
| 0x4
| float, not used by [[System_Settings]].
|-
| 0xC
| 0x20
| 4 coordinate entries: head top-left, head bottom-right, head bottom-left, and head top-right.
|-
| 0x2C
| 0x14
| Not used by [[System_Settings]].
|}

The total size of this structure is 0x40-bytes.

==Coordinate entry==
{| class="wikitable" border="1"
|-
!  Offset
!  Size
!  Description
|-
| 0x0
| 0x4
| float x
|-
| 0x4
| 0x4
| float y
|}

The total entry size is 0x8-bytes. The range for these two floats are -1.0f..1.0.f. These are relative to the center of the screen.