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@@ -42,8 +42,10 @@ class GraphicsStateGuardian;
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//
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// This can be used to generate real-time imagery of a
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// 3-d scene using a nonlinear camera, for instance a
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-// fisheye camera, even though the 3-d graphics engine
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-// only supports linear cameras.
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+// fisheye camera, even though the underlying graphics
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+// engine may only support linear cameras. It can also
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+// pre-distort imagery to compensate for off-axis
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+// projectors, and/or curved screens of any complexity.
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//
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//
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// A NonlinearImager may be visualized as a dark room
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@@ -56,9 +58,13 @@ class GraphicsStateGuardian;
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//
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// There also exist in the room one or more (possibly
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// nonlinear) cameras, called viewers, that observe
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-// these screens. Each of these viewers is associated
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-// with a single DisplayRegion, where the final results
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-// are presented.
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+// these screens. The image of the projection screens
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+// seen by each viewer is finally displayed on the
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+// viewer's associated DisplayRegion. By placing the
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+// viewer(s) appropriately relative to the screens, and
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+// by choosing suitable lens properties for the
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+// viewer(s), you can achieve a wide variety of
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+// distortion effects.
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//
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//
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// There are several different LensNode (Camera) objects
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@@ -73,10 +79,15 @@ class GraphicsStateGuardian;
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// seen from the screen's source camera is called a
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// projector; these are set via the
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// ProjectionScreen::set_projector() interface.
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-// Finally, the (possibly nonlinear) cameras that view
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-// the whole configuration of screens are called
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-// viewers; each of these is associated with a
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-// DisplayRegion, and they are set via set_viewer_camera().
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+// Finally, the cameras that view the whole
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+// configuration of screens are called viewers; each of
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+// these is associated with a DisplayRegion, and they
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+// are set via set_viewer_camera().
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+//
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+// Of all these lenses, only the source cameras must use
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+// linear (that is, perspective or orthographic) lenses.
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+// The projectors and viewers may be any arbitrary lens,
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+// linear or otherwise.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDAFX NonlinearImager {
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PUBLISHED:
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David Rose