I started trying to draw a hemisphere with the appropriate texturing coordinates using GEMgl commands, but that was getting too complicated so I copied the sphere object source, made it draw a hemisphere, and changed how it does texturing... I'll share it once I get all of the kinks ironed out.
-Alex On 10/17/07, marius schebella <[EMAIL PROTECTED]> wrote: > hmm... no, I don't know how to do it. with gem you can only do > rectangular projection/texturing. so you would have to find a way to > distort the texture so that it will be displayed correctly on one half > of the sphere. you probably need some vertex shader to do that... > marius. > > > Alex wrote: > > so to make this easy think of a square texture that has a picture the > > globe centered inside it. > > i want to take that picture and map the flat image of the globe onto a > > hemisphere so that you see [in this virtual world] 1/2 of a globe, > > warped so that, in the virtual world, it looks correct. > > > > -Alex > > > > On 10/15/07, marius schebella <[EMAIL PROTECTED]> wrote: > >> 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 <[EMAIL PROTECTED]> 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 > >>>> > >>> _______________________________________________ > >>> [email protected] mailing list > >>> UNSUBSCRIBE and account-management -> > >>> http://lists.puredata.info/listinfo/pd-list > >>> > >> > > > > _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
