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 marius.schebella@gmail.com 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 x37v.alex@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
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