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| This one is for those who develop and review VRML implementations and
specification.
Will (or can, perhaps does?) VRML support real time or pre-computed
lighting?
Real time lighting has progressed tremendously over the past few years. Both
real time and pre-computed lighting has been used in many computer games for
over a decade. Lightmaps (or shadow mapping) should be simple to implement
(of course, most commercial modelling software do not compute lightmaps for
export, as far as I'm aware). And advances have been made in real time
radiosity and soft-shadow calculations recently. I was hoping that VRML
could support more advanced real-time and pre-computed shadows.
My interest in VRML stems form architectural visualisation. I've used VRML
quite a bit (exp from 3ds mostly), but the reoccuring problem is the lack of
shadow support. Shadows is extremely important in visualisation, often under
appreciated by modellers, as is apparently in many VRML worlds that can be
found on the web or elsewhere. With today's graphics hardware, this should
be a doddle.
I've made a number of successful VRML worlds by manually "painting" shadows,
but obviously it's a totaly chore. This also means that you have to texture
map every single surface, particularly impossible to do if you're modelling
interiors, where there are many more surfaces.
In fact, this isn't so much a VRML problem, but VR problem in general. I've
done some work on Vega/Creator (high end sim), and creating real time shadow
is problematic (though possible), and pre-computed lighting doesn't work
terribly well either (using Vertex shading, crap!)
Further more, in terms of shading quality, current Phong shading no long
create satisfactory visualisations. Can VRML currently support other more
advanced mode of shading? (this has nothing to with shadows, just a random
thought.)
Thanks
Henry
www.3thirteen.co.uk
staff.bath.ac.uk/abshhkc
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| Joerg Scheurich aka MUFTI 2004-02-18, 8:28 am |
| >Ipresumethtasomeofthesecapabiltiies,suchasmultitexturingcomefrom
>x3dratherthanVRML.Iwasn'tawarethanVRMLcandosomuch...
Someofthenewfeaturesinx3d(likemultitexturingandNURBS)arein
factpopularbrowserdependendextensionsofbrowserslikeblaxxuncc3d.
Inprinciple,itwouldbepossibletoimplementsomemultitexture
featuresinaPROTOwithascriptingnodeinstandardVRML97,butasfar
iknowit,nooneimplementedthisyet8-(
solong
MUFTI
--
DannPresse<tretenSieein>
(auseinemSoftwarehandbuch)
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| Joerg Scheurich aka MUFTI 2004-02-18, 11:31 am |
| > About Realtime shadows, look at
In some situations, there is also a simple way to fake realtime shadows
with standard VRML97. See
http://www.csv.ica.uni-stuttgart.de...ag/schatten.wrl
so long
MUFTI
--
Dann Presse <treten Sie ein>
(aus einem Softwarehandbuch)
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