E. Gröller and H. Löffelmann:

Extended camera specification for image synthesis

1994, Machine Graphics & Vision 3(3), pp. 514-530.


Typically a rather simple definition of the viewing parameters (e.g., perspective projection) is used for ray tracing, which is one of the most powerful rendering techniques for generating realistic images. In this paper this simple camera model is extended in several ways to increase user flexibility. A sequence of mappings defines a more general way to assign 3d rays for each pixel of the final raster image. These rays are then taken as primary rays in the following ray tracing step. An extended camera specification, for example, allows the projection of the object scene onto more general projection surfaces (quadrics, free form surfaces). Different views of the same object scene may be incorporated within one single image. A test implementation and sample images show the feasibility of the approach. The extended camera specification enables more elaborate viewing techniques which may be used, e.g., for virtual reality, arts and special effects.

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