Camera projections & elliptical filtering

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Camera projections & elliptical filtering

Camera projections & elliptical filtering

2004-03-09 - By Dave Lajoie

Back

Reply: 1 2 3 4 5 6 7 8 9 10

Bernard,
Why use -c when -p does build the 12 resolutions automatically for you? unless
you want to apply post process affects on certain resolution(s), which may
cause problem during resolution interpolation in the elliptical filtering
computation.

Dave

-- --Original Message-- --
From: owner-xsi@(protected) on behalf of Bernard Lebel
Sent: Tue 09/03/2004 6:22 AM
To: XSI@(protected)
Cc:
Subject: Re: Camera projections & elliptical filtering

Ok I'll give more details because I did my little investigation, and there
are things that I didn't know at that moment.

The way we have been working so far is that the texture artists do some
prelighting on the textures by baking shadows on the textures, using
rendermaps. I thought they were using camera projections throughout the
whole process but they are not, they unwrap the UVs standard style. They
rendermap using the original projection, then reapply the rendermapped
textures using the same projection again. So now I'm pretty sure our
problems are not related to the projections.

Our problem is this: We are trying to use .map files with pyramidal
filtering but it doesn't seem to be working as it should.

The way the texture folks are creating the .map files is that they create 12
versions of the same textures at different resolutions, and combine them
into a single .map fil using "imf_copy -p -c" options. Could the -c option
be broken?

Now, the only way we can get the different resolution textures of the .map
files is by using elliptical filtering. Otherwise, it seems we are stuck
with the maximum resolution image. But when we activate elliptical
filtering, we get terrible artefacts. The "layers" do not blend properly, we
get blockiness. Therefore, we can't take advantage of the technique at all,
the entire image is loaded in memory at render time. Since we work at film
res........... Batchserve barfs crashes and errors.

I thought it had to do with camera projections because elliptical filtering
is very sensitive to the projection you're using. But I found that camera
projections were not used 99% of the time. So I discard this cause. Planar
and cylindrical projections are used most of the time.

So to summarize....
- Could the -c option be broken? It doesn't seem so, as it combines properly
the input textures.
- But then would it better to use one input file with only the -p option?
- Are there known problem with elliptical filtering and pyramidal map files?
The mr docs says they have to be used in conjonction to get smooth results,
but we don't get smooth results at all (though this area is still under
investigation).

Any other suggestion?

Thanks a lot
Bernard

http://www.bernardlebel.com
http://www.xsimontreal.com
http://www.xsibase.com

>From: A_K <xsi@(protected)>
>Reply-To: XSI@(protected)
>To: Bernard Lebel <XSI@(protected)>
>Subject: Re: Camera projections & elliptical filtering
>Date: Tue, 9 Mar 2004 02:16:51 +0200
>
>Hello Bernard,
>
>did you try changing from explicit to implicit in the
>projection menu?
>
>BL> Hello,
>
>BL> Has anyone had any problem with camera projections and elliptical
>filtering?
>
>BL> The texture folks here use camera projections most of the time, and
>thye
>BL> convert to pyramidal filtered .map files.
>BL> Now, since we have to use elliptical filtering to get good results with
>BL> pyramidal files, we get prettyweird artefacts. I mean serious stuff,
>the
>BL> kind that is not usable (the various resolution textures blend awefully
>BL> together).
>BL> Now after a reading of the mr docs, I begin to suspect that it is
>related to
>BL> camera projections, even though they are generally frozen before
>rendering.
>
>BL> Any help or pointer in the right direction would be quite wlecome.
>
>
>BL> Thanks
>BL> Bernard
>
>
>
>BL> http://www.bernardlebel.com
>BL> http://www.xsimontreal.com
>BL> http://www.xsibase.com
>
>BL> __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __
>BL> Add photos to your e-mail with MSN Premium. Get 2 months FREE*
>BL>
>http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http
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>
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>body:
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>
>
>
>
>--
>Best regards,
> A_K mailto:xsi@(protected)
>
>---
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>unsubscribe xsi

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<DIV>
<DIV>Bernard,</DIV>
<DIV>Why use -c when -p does build the
12 resolutions automatically for you? unless you want to apply post
process affects on certain resolution(s), which may cause problem during
resolution interpolation in the elliptical filtering computation.</DIV>
<DIV> </DIV>
<DIV>Dave</DIV></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV>-- --Original Message-- -- From:
owner-xsi@(protected) on behalf of Bernard Lebel Sent:
Tue 09/03/2004 6:22 AM To: XSI@(protected) Cc:
 Subject: Re: Camera projections & elliptical
filtering </DIV>
Ok I'll give more details because I did my little
investigation, and there are things that I didn't
know
at that moment. 
The way we have been working so far is that the texture
artists do some prelighting on the textures by baking
shadows on the textures, using rendermaps. I thought
they were using camera projections throughout the whole process but they are not, they unwrap the UVs standard style.
They rendermap using the original projection, then
reapply the rendermapped textures using the same
projection again. So now I'm pretty sure our problems
are not related to the projections. 
Our problem is this: We are trying to use .map files with
pyramidal filtering but it doesn't seem to be working
as it should. 
The way the texture folks are creating the .map files is that
they create 12 versions of the same textures at
different resolutions, and combine them into a single
.map fil using "imf_copy -p -c" options. Could the -c option be broken? 
Now, the only way we can get the different resolution
textures
of the .map files is by using elliptical filtering.
Otherwise, it seems we are stuck with the maximum
resolution image. But when we activate elliptical filtering, we get terrible artefacts. The "layers" do not blend
properly, we get blockiness. Therefore, we can't take
advantage of the technique at all, the entire image
is
loaded in memory at render time. Since we work at film res........... Batchserve barfs crashes and errors. 
I thought it had to do with camera projections because
elliptical filtering is very sensitive to the
projection you're using. But I found that camera projections were not used 99% of the time. So I discard this cause.
Planar and cylindrical projections are used most of
the time. 
So to summarize.... - Could the -c
option be broken? It doesn't seem so, as it combines properly 
the input textures. - But then would it better
to use one input file with only the -p option? - Are
there known problem with elliptical filtering and pyramidal map files?
 The mr docs says they have to be used in conjonction
to get smooth results, but we don't get smooth
results
at all (though this area is still under investigation). 
Any other suggestion? 
Thanks a lot Bernard 
<A
href="http://www.bernardlebel.com">http://www.bernardlebel.com</A>
 <A
href="http://www.xsimontreal.com">http://www.xsimontreal.com</A>
 <A
href="http://www.xsibase.com">http://www.xsibase.com</A>
 
>From: A_K <xsi@(protected)> >Reply-To: XSI@(protected) >To:
Bernard
Lebel <XSI@(protected)> >Subject: Re:
Camera projections & elliptical filtering >Date: Tue, 9 Mar 2004 02:16:51 +0200 > >Hello Bernard, > >did you try  changing from
explicit to implicit in the >projection
menu? > >BL>
Hello, > >BL> Has
anyone had any problem with camera projections and elliptical 
>filtering? > >BL> The texture folks here use camera projections most of the
time, and >thye >BL>
convert to pyramidal filtered .map files. >BL>
Now, since we have to use elliptical filtering to get good results with
 >BL> pyramidal files, we get prettyweird artefacts. I
mean serious stuff, >the >BL> kind that is not usable (the various resolution textures
blend awefully >BL> together). >BL> Now after a reading of the mr docs, I begin to suspect that
it is >related to >BL> camera projections, even though they are generally frozen
before >rendering. > >BL> Any help or pointer in the
right direction would be quite wlecome. >
 > >BL> Thanks
 >BL> Bernard >
 > > >BL> <A
href="http://www.bernardlebel.com">http://www.bernardlebel.com</A>
 >BL> <A
href="http://www.xsimontreal.com">http://www.xsimontreal.com</A>
 >BL> <A
href="http://www.xsibase.com">http://www.xsibase.com</A> > >BL>
__ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __
 >BL> Add photos to your e-mail with MSN Premium. Get 2
months FREE* >BL> >
<A
href="http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994
&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines">http:/
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> >BL> --- >BL> Unsubscribe? Mail Majordomo@(protected) with the
following
text in >body: >BL>
unsubscribe xsi > > > >
 >-- >Best regards,
 > 
A_K            
             
  
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