Hi Robert,
I must say that you explained it very clearly.
I hope you add this to osg. As I said before, I expect that some other
texture classes need the addition of setting the texture matrix with
scale 1,1,1 so these need some attention.
I will go on vacation so will not reply in the next few weeks.
cheers
Raymond
Robert Osfield wrote:
Hi Ulrich and Raymond,
In general I try to stick with the way OpenGL does things, and this
works pretty generally as mostly OpenGL is well thought out API.
However, there are hump dingers like TextureRectangle which are
totally inconstent with the rest of OpenGL, it basically is a hack to
get basic NPOT working, but without really thinking of the consequences.
I don't understand why the texture rectangle didn't go for proper no
dimensional coordinates, the fact it doesn't is a pain in the butt,
espcially for the types of usage that Raymond wishes to use, where
data is streaming in and the size of the imagery can change. With non
dimensional coords this has absolutely no effect on the end results,
but with TextureRectangle dimensional coords one has to modify the
texcoords of the geometry, this means quite a bit of syncing code to
keep the texture in the right place.
The option that Raymond has added makes TextureRectangle behave like
the rest of OpenGL textures, and make it properly non dimensional.
This is just an option though.
Robert.
On 9/1/06, *Raymond de Vries* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Hi,
Well, I am pretty sure there are a lot of reasons why this should be
right or wrong. I think this is up to Robert since he has
suggested this
option a while ago. For me this is an option to change the size of
the
texture with keeping the texture coordinates unchanged.
Also, it is implemented as an option, and it needs to be enabled
explicitly so the default behaviour is still the same. Also, I think
that osg is 'smart' in other places too.
bye
Raymond
Ulrich Hertlein wrote:
> Hi Raymond,
>
> Raymond de Vries wrote:
>> As I promised a while ago I have added support for using
regular texture
>> coordinates while using the TextureRectangle class (which is
especially
>> useful for video streaming as is implemented in the osgmovie
example
>> right
>> now).
>>
>> I've done this by manipulating the texture matrix, in the
>> TextureRectangle::apply().
>
> Are you sure this is such a good idea?
>
> For one it's not OpenGL conformant behaviour so it's different from
> what people would expect (as EXT_texture_rectangle states that image
> space texcoords are used; however odd/unintuitive that may be).
Also
> it doesn't play well with user specified texture coordinates as I
> understand it (it overwrites them).
>
> Personally I prefer software systems that don't attempt to be
smart in
> unusual cases because most of the times you either aren't aware of
> what they're doing or they're not smart enough...
>
> Cheers,
> /ulrich
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>
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