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
