[PD] Re : camera angle
raphael.ilias at yahoo.fr
Thu Nov 15 12:18:24 CET 2007
thanks both, i started to try changing the 'perspec' values, but with the explanations it makes more sense than doing it by intuition.
the gemwin-helpfile i had read only explained five arguments with 'view' message, instead of nine which seems to be a different method.
thanks a lot !
----- Message d'origine ----
De : marius schebella <marius.schebella at gmail.com>
À : reduzierer at yahoo.de
Cc : Raphaël ILIAS <raphael.ilias at yahoo.fr>; pd-list <pd-list at iem.at>
Envoyé le : Jeudi, 15 Novembre 2007, 2h25mn 10s
Objet : Re: [PD] camera angle
I misunderstood the question and posted an unrelated answer, sorry.
Roman Haefeli wrote:
> hi raphaël
> i admit, this is not very obvious and it took me some time as well to
> figure it out, but the solution you are looking for is the 'perspec'
> method of [gemwin].
> the default values are 'perspec -1 1 -1 1 1 20', where the first to
> numbers set the hoizontal visible limits/angles for left and right
> the following two numbers the vertical limit (top and bottom). you
> use these to compensate the distortion, that is introduced, when
> displaying with non-square pixels, e.g when you use fullscreen mode
> 640x480 resolution on a screen with an aspect ratio of 16:10 (to
> compensate that you would use 'perspec -1.2 1.2 -1 1 1 20').
> now the interesting part is, when you scale all four values by the
> amount, you can change the focal distance of your camera:
> 'perspec -0.5 0.5 -0.5 0.5 1 20'
> gives you a more tele-ish look. this is probably what you are looking
> for. the smaller numbers you choose, the bigger gets the focal
> of the camera.
> the default scale '1' looks already like a fisheye to me, though it
> makes kind of sense to cover a wide angle on the window in order to
> orientation easier.
> On Wed, 2007-11-14 at 21:52 +0000, Raphaël ILIAS wrote:
>> i'm working on a project with gem and i would really be glad if i
knew how to change the "angle" of the viewpoint. i tried with [view a b c
d e( msg to to the gemwin or with the [camera] object but got nothing
like that. i searched in help-files, examples and the html manual but
found nothing about it. In project there is a 3D-model that represents a
building. I would like it to be impressive but with every camera
position i tried, the building appears ridiculous, like a toy (because of
perspective i think), or i go "underground" (i mean under the horizontal
[square] that represents the ground), or i get a "fish-eye"-like
impression. if i move the camera close to the model, it is cuted and we see
the inside of the Geo.
>> has anyone got an idea ?
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