From: doug price (doug++at++ntserver.paradigmsim.com)
Date: 04/17/2000 06:14:02
NSL tries to simplify the performer interface to provide for easier
configuration of light points. In doing so it makes certain assumptions
which are valid in most cases. If the Light Point Type "Control" option is
set to "Performer" then Performer is still doing all light point
computations and rendering using exactly the same methods described in the
Performer documentation. If the default values set by NSL are not
satisfactory for your application, you can get the pfLPointState from the
vgLPType through the call vgGetLPTypePfLPointState and can change any of the
default values set by NSL.
Doug Price
Multigen-Paradigm Inc.
phone: (972) 960-2301 fax: (972) 960-2303
email: doug++at++paradigmsim.com http://www.multigen-paradigm.com
> -----Original Message-----
> From: info-performer++at++sgi.com [mailto:info-performer++at++sgi.com]
> Sent: Saturday, April 15, 2000 4:00 AM
> To: allan++at++holodeck.engr.sgi.com
> Subject: info-performer Apr 14 2000
>
>
> From: Jean-Sebastien Dion <jsdion++at++cae.ca>
> Date: Fri, 14 Apr 2000 08:42:33 -0400
> Subject: Quastion on the VEGA NSL module
>
> Hi.
>
> I'm reading the VEGA NSL documentation, and I have some
> questions about how
> light points size and transparency is handled by NSL.
>
> First, since I can't find anything on the size variation of
> light points, I
> assume the light points size ALWAYS decreases with respect to
> perspective
> projection as it is done by Performer with the
> PFLPS_SIZE_MODE_ON flag. Am
> I right ? Furthermore, I can't see any minimum or maximum
> light point size
> as it can be specified with Performer (i.e. PFLPS_SIZE_MAX_PIXEL,
> PFLPS_SIZE_MIN_PIXEL). Is there anything like that available
> through NSL?
>
> And now, for the transparency: is it realy just a LINEAR
> variation from 0%
> to 100% transparent in the range
> [VGLTYPE_FADERANGE*VGLTYPE_RANGE, VGLTYPE_RANGE] ? That
> would mean no fancy
> control like what's available on Performer through the
> PFLPS_TRANSP_xxx
> constants.
>
> So, ... can someone explain me how the light point size and
> transparency
> calculations are done ?
>
> And if someone ever tried NSL, can you tell me if this
> limited flexibility
> on the light points size and transparency is good enough to
> model runway
> lights, compared to what can be achieved with all the
> Performer controls ?
>
>
> Thanks.
>
>
> J.-S.
>
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