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
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
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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 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
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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 marius.schebella@gmail.com 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 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
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
I don't know, but it could help you : http://laeti.perrierbrusle.free.fr/projections_ESRI.pdf http://www.madore.org/~david/math/carto.pdf It's in french and about world map.
Jack
Le 17 oct. 07 à 23:08, Alex a écrit :
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 marius.schebella@gmail.com 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 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 youAlex 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
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http:// lists.puredata.info/listinfo/pd-list
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/ listinfo/pd-list
-
Alex -
Jack -
marius schebella