Texture Mapped Projection

Describes a projection for the Viewport that is a flat projection described by simple frustum, which may be asymmetric.

• type
  string = “TextureMappedProjection”

  Defines the type of this projection.

• fov
  one of the following

  This element describes the field of view used the camera in this planar projection.

  Option 1

  • hfov
    number [0.0, \(\infty\))

    The angle (in degrees) covered by the camera in the horizontal direction. This is a symmetric frustum around the center and provides the same result as providing the left and right values with the half-angle.

  • vfov
    number [0.0, \(\infty\))

    The angle (in degrees) covered by the camera in the vertical direction. This is a symmetric frustum around the center and provides the same result as providing the up and down values with the half-angle.

  Option 2

  • left
    number

    The angle (in degrees) that is covered by the camera between the central point and the left border of the viewport. The left and right angles added together are the vertical field of view of the viewport.

  • right
    number

    The angle (in degrees) that is covered by the camera between the central point and the right border of the viewport. The left and right angles added together are the vertical field of view of the viewport.

  • down
    number

    The angle (in degrees) that is covered by the camera between the central point and the bottom border of the viewport. The down and up angles added together are the vertical field of view of the viewport.

  • up
    number

    The angle (in degrees) that is covered by the camera between the central point and the top border of the viewport. The down and up angles added together are the vertical field of view of the viewport.

• distance (optional)
  number

  The distance (in meters) at which the virtual render plane is placed. This value is only important when rendering this viewport using stereoscopy as the distance and the Users eyeSeparation are used to compute the change in frustum between the left and the right eyes.

• orientation (optional)
  orientation

  Describes a fixed orientation for the virtual image plane. This can be provided either as Euler angles or as a quaternion.

• offset (optional)
  vec3

  A linear offset in meters that is added to the virtual image plane. Must define three float attributes x, y, and z. The default values are x=0, y=0, z=0, meaning that no offset is applied to the image plane.