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The traditional camera used in 3d packages is a simple pinhole camera. Although imagery rendered with
this model can be treated with 2d software to replicate such lens effects as depth of field, chromatic aberration,
and distortion, these processes are approximations and cannot encompass some of the more extreme
camera projections often required.
Aperture is a shading solution that allows scenes to be rendered from dynamic perspectives
using a range of lenses modeled after their real-world counterparts: from the physical Fisheye lens
to the decidedly non-physical Cubic and Cylindrical lenses.
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