Hi all
I'm pretty inexperienced with GEM, so I might be missing something obvious, but is it possible to give objects individual perspective?
I'd like to have 4 cubes side by side that all look the same. If I use translateXYZ to space them out, the ones on the outside get really exaggerated perspective.
Turning off perspective with ortho helps, of course, but I'm using a rectangular window and GEM seems to want to scale the X-Y ratio of the objects to match. (And I'd rather have perspective)
Am I making sense?
cheers dafydd
Am 15.06.2005 um 02:14 schrieb dafydd hughes:
I'm pretty inexperienced with GEM, so I might be missing something obvious, but is it possible to give objects individual perspective?
? multiple objects with individual perspective? i'm curious, my imagination is limited to my 4 dimensions.
I'd like to have 4 cubes side by side that all look the same. If I use translateXYZ to space them out, the ones on the outside get really exaggerated perspective.
what you might want is to change the shape of your viewpoint or frustum. see in the helpfile for [gemwin] the [pd viewing] subpatch. if you find the perspective exaggerated try [perspec -0.5 0.5 -0.5 0.5 1 20( to gemwin.
Turning off perspective with ortho helps, of course, but I'm using a rectangular window and GEM seems to want to scale the X-Y ratio of the objects to match. (And I'd rather have perspective)
?
Thanks for your reply, Max
Max Neupert wrote:
? multiple objects with individual perspective? i'm curious, my imagination is limited to my 4 dimensions.
I didn't do a very good job of explaining myself. I've created a picture of what I'm trying to do:
http://www.sideshowmedia.ca/cubes.jpg
Basically, each object stays where it is but can be rotated. Problem is, as soon as I try to space the cubes out, perspective takes over...
what you might want is to change the shape of your viewpoint or frustum. see in the helpfile for [gemwin] the [pd viewing] subpatch.
This is a great suggestion - thanks. I will definitely explore it further.
cheers dafydd
I think this comes from the fact that Gem uses a very wide-angle virtual lens to look at the model space, the equivalent of a 40-ish mm camera lens. I think that parameter is controllable withing openGL but I can't find anything in Gem that allows to change this...
simply making the cubes bigger and further away doesn't fix it; you really need a narrower camera angle. Perhaps some Gem expert knows how to set this?
cheers Miller
On Tue, Jun 14, 2005 at 09:38:14PM -0400, dafydd hughes wrote:
Thanks for your reply, Max
Max Neupert wrote:
? multiple objects with individual perspective? i'm curious, my imagination is limited to my 4 dimensions.
I didn't do a very good job of explaining myself. I've created a picture of what I'm trying to do:
http://www.sideshowmedia.ca/cubes.jpg
Basically, each object stays where it is but can be rotated. Problem is, as soon as I try to space the cubes out, perspective takes over...
what you might want is to change the shape of your viewpoint or frustum. see in the helpfile for [gemwin] the [pd viewing] subpatch.
This is a great suggestion - thanks. I will definitely explore it further.
cheers dafydd
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Miller Puckette wrote:
I think this comes from the fact that Gem uses a very wide-angle virtual lens to look at the model space, the equivalent of a 40-ish mm camera lens. I think that parameter is controllable withing openGL but I can't find anything in Gem that allows to change this...
simply making the cubes bigger and further away doesn't fix it; you really need a narrower camera angle. Perhaps some Gem expert knows how to set this?
If you make the cubes the same size but further away:
[translateXYZ 0 0 -6.0] | [cube]
...and set the perspective so as to view a smaller part of the scene:
[perspec -0.3 0.3 -0.3 0.3 1 100( | [gemwin]
...you get the telephoto effect. And you can back off as far as you like until you get the lack of perspective you desire, but there is no way to have more than one point of view in a gemwin at the same time, except for something like using pix_write and pix_image to save individual views and then display them together.
Martin
cheers Miller
On Tue, Jun 14, 2005 at 09:38:14PM -0400, dafydd hughes wrote:
Thanks for your reply, Max
Max Neupert wrote:
? multiple objects with individual perspective? i'm curious, my imagination is limited to my 4 dimensions.
I didn't do a very good job of explaining myself. I've created a picture of what I'm trying to do:
http://www.sideshowmedia.ca/cubes.jpg
Basically, each object stays where it is but can be rotated. Problem is, as soon as I try to space the cubes out, perspective takes over...
what you might want is to change the shape of your viewpoint or frustum. see in the helpfile for [gemwin] the [pd viewing] subpatch.
This is a great suggestion - thanks. I will definitely explore it further.
cheers dafydd
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
Hi!
Perhaps the [ortho] object in Gem is what you are searching?
Peter
dafydd hughes wrote:
Hi all
I'm pretty inexperienced with GEM, so I might be missing something obvious, but is it possible to give objects individual perspective?
I'd like to have 4 cubes side by side that all look the same. If I use translateXYZ to space them out, the ones on the outside get really exaggerated perspective.
Turning off perspective with ortho helps, of course, but I'm using a rectangular window and GEM seems to want to scale the X-Y ratio of the objects to match. (And I'd rather have perspective)
Am I making sense?
cheers dafydd
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
-
dafydd hughes -
Martin Peach -
Max Neupert -
Miller Puckette -
Peter Plessas