[PD] texturing a circular image onto a hemisphere in GEM
marius schebella
marius.schebella at gmail.com
Tue Oct 16 02:47:33 CEST 2007
Hi alex,
I am not sure what you're trying to do, but I am eager to help you...
do you want to project the video onto a wall/ceiling hemisphere inside a
real room? or are you talking about virtual projections?
I guess what you have to do first is distort the circled video back into
a square and then use that to texture the sphere.
marius.
sphere with a ? is it just the mapping on the spherefor any distortion you
Alex wrote:
> Maybe a different subject will inspire some help?
>
> basically, I have video that was shot on a mirrored spherical ball..
> this gives a circular image inside a rectangular video, I've figured
> out how to crop it so that I just get the square that surrounds the
> circle, but I cannot figure out how to correctly map this texture onto
> a sphere so that it is only on one hemisphere and so that the circle's
> circumference is on a "great circle" of the sphere? [ie it the circle
> is warped out so that it becomes a hemisphere].
>
> I figure maybe I have to do some GEMgl stuff for this?
>
> if anyone has done this, would you please share?
>
> If not, any advice?
>
> Thanks,
> -Alex
>
>
> On 10/10/07, Alex <x37v.alex at gmail.com> wrote:
>> I have some panoramic video that I want to use to texture a hemisphere
>> [or rather, the bottom half of a sphere].
>>
>> I cannot simply texture the sphere with the video because the warping
>> is not correct.. it seems that I need some sort of non-rectangular
>> warping of the image before I texture the object, or a non-rectangular
>> mapping of the texture onto the sphere.
>>
>> Any ideas or advice? Does anyone else have experience working with
>> panoramic video in Gem?
>>
>> -Alex
>>
>
> _______________________________________________
> PD-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
>
More information about the Pd-list
mailing list