You can bake illumination with regular rendermap too - looks much better to
me - with the bump and geometric detail and displacement. You're loosing
most of that with vertexmap.
And with the density of meshes I had it was crashing all the time.
For a human face I'm down to 3-4 maps as is - and the comped results are
fine. For full body it can be 8 or so and for quadrupeds 10 and upwards.
With a lightmap working in UVspace this would be one single rendermap -
doenst seem all that far fetched to me.
----- Original Message -----
From: "Andreas Bystrom" <andreas.bystrom(at)gmail.com>
To: <XSI(at)Softimage.COM>
Sent: Tuesday, May 27, 2008 11:09 PM
Subject: Re: rendermap / lightmap SSS shader
you can also try baking the illumination into a vertexmap, and then
"comp" the textures on top of that.
if you need lots of detail you can subdivide the mesh a bit. I found
this method to be working rather well, I still had to rendermap from
3-4 different camea-locations but it was much easier to get nice
smooth results compared to rendermapping into textures.
On Tue, May 27, 2008 at 9:07 PM, peter boeykens <peter_b(at)skynet.be> wrote:
Thanks for the link.
I am doing multiple rendermaps with the camera in different positions, and
recombining them - this gives me a fairly good result.
It's just a lot of work - mostly because of the very slow rendering times
and instability of rendermap.
A 2k rendermap is 1.5 hours on average on the stuff I'm working on -
regular
2k renders are less than 15 minutes. I'm scripting overnight renders of
several rendermaps which helps out a lot - but one night out of two
rendermap either crashes, freezes or simply disappears.
...
----- Original Message ----- From: "Halfdan Ingvarsson"
<hingvars(at)Softimage.COM>
To: <XSI(at)Softimage.COM>
Sent: Tuesday, May 27, 2008 5:06 PM
Subject: RE: rendermap / lightmap SSS shader
It's not complicated what it does. It's basically a trick they used on
Finding Nemo, described in some Siggraph notes, but using the camera's
pov,
rather than the light's pov. (see:
http://graphics.stanford.edu/facecourse/facecloning05/Presentations/scat.pdf
)
The lightmap contains the interleaved illumination of the front and back
surfaces (+depth of back) as seen from the camera, then the fast_sss
shader
simply blurs the image samples based on distance, for each sample lookup.
This is why this trick won't work in a wraparound mode. If you froze the
lightmap and then orbited, the SSS effect would look quite funky where you
were viewing perpendicular to what the original camera's sampling position
was.
The only decent way to do it would be something along the lines of what
Alan
describes.
- ½
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
Of
Alan Jones
Sent: 27-May-2008 10:55
To: XSI(at)Softimage.COM
Subject: Re: rendermap / lightmap SSS shader
On Tue, May 27, 2008 at 3:20 PM, peter boeykens <peter_b(at)skynet.be> wrote:
For "unsupporting" SSS - this seems lame - as it wouldn't take all
that much to get it to work.
The downfall is with the lightmap being camera dependent.
I dont think that's a limitation of lightmaps - as color sampler
lightmap is working with UV space.
The fast SSS shaders don't do anything akin to an ordinary lightmap in UV
space.
They use lots of strange trickery behind the scenes to do their work and
Zap
is very tight lipped on their secret sauce used. Don't forget that Halfy
is
an exceptionally intelligent guy, if there was something on his end he
could
do to resolve this it would already be done.
There's nothing stopping you from writing/employing someone to write your
own SSS shader which could achieve similar speed using lightmaps by doing
some nice trickery to store to a kdtree/bih instead of a UV space texutre
and then looking that up within the main shader. It'd be nice and fast and
you'd avoid the camera dependency that makes fast SSS so unhappy.
Though if you use SSS a lot grab a copy of 3Delight - their SSS is
absolutely gorgeous, though I've not look at whether they support
rendermapping in XSI, though I'm sure Aghiles would be more than happy to
provide customers with something that does this within XSI in order to get
3Delight into a new facility.
Cheers,
Alan.
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