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000360_owner-lightwave-l _Wed Aug 10 08:17:13 1994.msg
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Received: by mail3.netcom.com (8.6.8.1/Netcom) id HAA19511; Wed, 10 Aug 1994 07:18:29 -0700
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Date: Wed, 10 Aug 1994 07:13:59 -0700
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To: lightwave-l@netcom.com
From: mccabejc@sce.com (Jim McCabe)
Subject: Re: Ripples
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>>Ripples Bump Map. Does the Texture Size ellipsoid determine the volume
>>outside of which the ripples stop,
Jeric@cup.portal.com replies:
>
> No, that would be "falloff".
Falloff is the ripple attenuation with distance from the source, not the
volume outside of which the ripples stop.
>> and does it have nothing to do with the
>>dimensions of the individual ripples (which are determined solely by
>>Amplitude and Wavelength)?
>
> Correct, SIZE only applies to the wave generators, not the waves
> themselves.
>
I must be stupid on this issue, but for the life of me I can't understand
what the Texture Size parameter in the Ripples Bump Map defines. It seems
that an assumed sinusoidal wave is defined by two parameters, Amplitude and
Wavelength. Unless the Texture Size defines some volume outside of which the
texture does not exist (which my experimenting shows doesn't appear to be
the case), or in fact overrides the Amplitude and Wavelength parameters, I'm
baffled. Any help would be greatly appreciated.