Defines how positions on a surface are represented and provides the
coordinates used by a field.
Remarks
The primary use case is spherical surfaces, where the sampler provides
normalized direction vectors with components in the range [-1, 1].
However, alternative samplers may represent other surface types, such as
planar surfaces, provided the field implementation supports the supplied
coordinate space.
Defines how positions on a surface are represented and provides the coordinates used by a field.
Remarks
The primary use case is spherical surfaces, where the sampler provides normalized direction vectors with components in the range [-1, 1]. However, alternative samplers may represent other surface types, such as planar surfaces, provided the field implementation supports the supplied coordinate space.