Re: Specular Reflection

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Remi Arnaud (arnaud++at++pobox.oleane.com)
Thu, 11 May 1995 11:15:31 +0000

>Hi All,
>
>The current maximum shininess is 128.0 and gives a bit too large a diameter of
>a reflection. Is there any way to shrink the reflection smaller.
>
>The application we are using this for is specular reflection in the IR. We can
>calculate what exitance (color) and want hardware to calculate which facets to
>illuminate. The problem is that the reflection angle is too big even at the
>maximum shininess (128.0) setting.
>
>Any suggestions?
>
>Thanks,
>John
>
>--
>John A. Collier e-mail: jcollier++at++mtl.com
>MTL Systems, Inc. voice: (513) 426-3111
>3481 Dayton-Xenia Rd. fax: (513) 426-8301
>Dayton, OH 45432-2796
>
>
>

The problem is coming from the fact that maximum specular rendering (with a
value of 128) is done by doing gouraud shading with the near vertices of the
vertex which is the most illuminated. So if you have a rough tessellation of
your shape, even with a shininess of 128, the reflection on your shape will
be too large.
Try to tessellate your shape more precisely if you can.
Of course, this will have a cost on the number of faces to be rendered, but
you get nothing for nothing.

                                Philippe Poutignat
                                Thomson Training & Simulation SA
                                ZA Les Boutries
                                78703 Conflans Sainte Honorine
                                FRANCE

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