Ray tracing example ... Again and again...

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dcibiceli++at++etcusa.com
Wed, 17 Sep 97 11:39:56 EDT

Dear Performers,
        I am looking for a ray tracing example. It was mentioned here a few
weeks ago. A ray was intersected with ground and used to calculate ground
height from the viewpoint. If I am wrong please correct me. Is there a such
an example or am I hallucinating badly :-)

                                                                Dogan
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