[Bf-committers] normal maps, red/green channel inverted

Sean Olson seanolson at gmail.com
Tue Feb 22 22:35:31 CET 2011 

I also could not agree more.   Some standardization here would get rid of
plenty of headaches.  To be clear, the step that I would like to avoid is
under:
"GIMPing the image" on this page:
http://www.foro3d.com/f217/blender-normal-mapping-76567.html

(It's basically just instructing to invert the green channel)

<http://www.foro3d.com/f217/blender-normal-mapping-76567.html>I believe it
worked this way in 2.49 and currently works this way also though I have not
tested very recently.

If I recall the results of the last mailing list conversation on this
subject, the consensus was that there is no 'standard' on ways to do normal
mapping so Blender's is as good as anybody else's, and is not technically
'wrong'.  The problem is that most of the other apps have standardized in
'the other method'.  I tried tracking the email thread down, but after about
an hour of digging have given up.

-Sean


On Tue, Feb 22, 2011 at 12:26 PM, Morten Mikkelsen <mikkelsen7 at gmail.com>wrote:

> >
> > >Make it standard please, nmaps are something that you usually share
> > >between softwares. no point in forcing headaches to users
> >
> > >Daniel Salazar
> >
>
> May your first born be a son and may your harvest be plentiful!! :)
> I could not agree more. That's exactly why this patch needs to go in asap.
> Normal maps are indeed typically exported between tools.
>
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> >
> >
> > 2011/2/22 Knapp <magick.crow at gmail.com>:
> > > Just provide an external tool or add-on to fix the files. Perhaps pop
> up
> > a
> > > warning: this file has a broken bump-map, run XXX to fix it.
> > >
> > > On Tue, Feb 22, 2011 at 7:45 PM, Thomas Dinges <blender at dingto.de>
> > wrote:
> > >
> > >> I wouldn't do a hackish button either, if it works correct as in 2.49
> > >> it's fine and all we need.
> > >>
> > >> Am 22.02.2011 19:33, schrieb Ton Roosendaal:
> > >> > Hi all,
> > >> >
> > >> > The situation is worse apparently; up to Blender 2.49 the normal
> maps
> > >> > were fine, but the "newbump" patch in 2.51 made red channel become
> > >> > badly inverted.
> > >> >
> > >> > Having it work like in 2.49 is of course correct. Brings up the
> > >> > question if we should provide a hackish button to support bad normal
> > >> > maps created in the alpha/beta period.
> > >> >
> > >> > Morton's&  Mario's proposal is to not do this. I agree, it only
> makes
> > >> > UI uglier... :)
> > >> >
> > >> > -Ton-
> > >> >
> > >> >
> > ------------------------------------------------------------------------
> > >> > Ton Roosendaal  Blender Foundation   ton at blender.org
> > www.blender.org
> > >> > Blender Institute   Entrepotdok 57A  1018AD Amsterdam   The
> > Netherlands
> > >> >
> > >> > On 20 Feb, 2011, at 14:45, Dalai Felinto wrote:
> > >> >
> > >> >> Instead of "old Blender Normal maps" couldn't it be "invert color
> > >> >> channels [tooltip: old Blender Normal Maps - invert red/green
> > >> >> channels"? Or Blender was really the only software out there using
> > >> >> those inverted?
> > >> >>
> > >> >> I remember this being discussed a while ago (1year or +) but don't
> > >> >> remember what was the outcome of it.
> > >> >>
> > >> >> --
> > >> >> Dalai
> > >> >>
> > >> >> 2011/2/20 Ton Roosendaal<ton at blender.org>:
> > >> >>> Hi,
> > >> >>>
> > >> >>> I think Carsten's proposal is the nicest way, even when a bit
> > "ugly".
> > >> >>> We can add a version patch in .blend files that sets this button
> > >> >>> active for all old .blends, but not active for newly created
> > >> >>> textures.
> > >> >>>
> > >> >>> -Ton-
> > >> >>>
> > >> >>>
> > >>
> ------------------------------------------------------------------------
> > >> >>> Ton Roosendaal  Blender Foundation   ton at blender.org
> > >> www.blender.org
> > >> >>> Blender Institute   Entrepotdok 57A  1018AD Amsterdam   The
> > >> >>> Netherlands
> > >> >>>
> > >> >>> On 19 Feb, 2011, at 23:47, Carsten Wartmann wrote:
> > >> >>>
> > >> >>>> Am 19.02.2011 23:08, schrieb Dalai Felinto:
> > >> >>>>> I wonder if instead of a commandline it would be possible to do
> > >> >>>>> this
> > >> >>>>> conversion with Python. I'm not sure of the current status of
> bpy
> > >> >>>>> for
> > >> >>>>> image handling, but it would be neat to have an addon for that.
> > >> >>>> My idea was having a Button inside the Texture Context, Image Tab
> > >> >>>> (beneath the Normal Map Button) to use "old Blender Normal maps".
> > >> >>>>
> > >> >>>> Carsten
> > >> >>>> --
> > >> >>>> Carsten Wartmann: Autor - Dozent - 3D - Grafik
> > >> >>>> Homepage:         http://blenderbuch.de/
> > >> >>>> Das Blender-Buch: http://blenderbuch.de/redirect.html
> > >> >>>> _______________________________________________
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> > >> >>>> Bf-committers at blender.org
> > >> >>>> http://lists.blender.org/mailman/listinfo/bf-committers
> > >> >>> _______________________________________________
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> > >> >>> http://lists.blender.org/mailman/listinfo/bf-committers
> > >> >>>
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> > >> >>
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> > >
> > >
> > >
> > > --
> > > Douglas E Knapp
> > >
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