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Create distortion.md #118

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4 changes: 2 additions & 2 deletions Configuring/distortion.md
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Expand Up @@ -108,8 +108,8 @@ We convert these into the specifications used in the current OSVR config-file fo

![Determine Canonical Screen](./images/determine_canonical.png)

* **display/hmd/field_of_view/monocular_horizontal:** This is computed as if the screen is being viewed by an eyepoint located along the line perpendicular to the center of the screen. We determine it using the half-screen width and the perpendicular distance from the origin to the plane of the screen. The ratio of these specify the tangent of half of the horizontal field of view.
* **display/hmd/field_of_view/monocular_vertical:** This is computed as if the screen is being viewed by an eyepoint located along the line perpendicular to the center of the screen. We determine it using the half-screen height and the perpendicular distance from the origin to the plane of the screen. The ratio of these specify the tangent of half of the vertical field of view.
* **display/hmd/field_of_view/monocular_horizontal:** This is computed as if the screen is being viewed by an eyepoint located along the line perpendicular to the center of the screen. We determine it using the half-screen width and the perpendicular distance from the origin to the plane of the screen. The ratio of these specify the tangent of half of the horizontal field of view. (This matches OSVR's assumption that the FOV is specified as if for a system with a center of projection in the center of the screen and then the eye is shifted to match the COP specified in the config file).
* **display/hmd/field_of_view/monocular_vertical:** This is computed as if the screen is being viewed by an eyepoint located along the line perpendicular to the center of the screen. We determine it using the half-screen height and the perpendicular distance from the origin to the plane of the screen. The ratio of these specify the tangent of half of the vertical field of view. (This matches OSVR's assumption that the FOV is specified as if for a system with a center of projection in the center of the screen and then the eye is shifted to match the COP specified in the config file).
* **display/hmd/field_of_view/overlap_percent:** This is computed as if the screen is being viewed by an eyepoint located along the line perpendicular to the center of the screen and as if both eyes were co-located (IPD = 0). (Note; the resulting viewing transform does not make this assumption, just the current algorithm to map from overlap_percent to angle.)
* **display/hmd/eyes[1]/center_proj_x:** This is computed as the fraction of the way from the left side of the screen to the right side where the line through the eye perpendicular to the screen crosses the screen.

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