Re: (Fwd) Fog implementation

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John Rohlf (jrohlf++at++tubes)
Fri, 20 May 94 8:42:41 PDT

>
> He have watch the difference with the his application and perfly and he has
> conclude this summary and a lot of question ?
>
> type of fog Near far status
>
> VtxLin,PixLin or [1.0,1000.0] 1000.0 no problem, it'ok
> spline if > 1000.0 8000.0 Problem why ??
>
> VtxExp/VtxExp2 no variation of the fog when we change the near
> PixExp/PixExp2
>
> 1. We don't seen what kind of value we can put on near ? and what is the
> minimum distance that i can define for the value "NEAR" of the interval for the
> fog ?

        Only linear and spline fog support a near fog distance.
I don't know why near > 1000 causes problems for spline fog.

>
> 3. Thus he exist a relation between the distance of visibility, the dynnamic in
> z of the system and the dynamic about the BDD (step of discretisation) ?
>
> My customer goes to the preparation of the ITEC and he told me that during the
> preparation about the demo of the shared database, He hav'nt seen a demo of
> performer with fog. Is it true or not ?

        perfly uses fog and has sliders for near/far distances and a
menu button for fog type. Try it.

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