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@gmail.com À : reduzierer@yahoo.de Cc : Raphaël ILIAS raphael.ilias@yahoo.fr; pd-list pd-list@iem.at Envoyé le : Jeudi, 15 Novembre 2007, 2h25mn 10s Objet : Re: [PD] camera angle

thanks, roman, I misunderstood the question and posted an unrelated answer, sorry. m.

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

and

the following two numbers the vertical limit (top and bottom). you

can

use these to compensate the distortion, that is introduced, when displaying with non-square pixels, e.g when you use fullscreen mode

with

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

same

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

distance

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

make

orientation easier.

roman

On Wed, 2007-11-14 at 21:52 +0000, Raphaël ILIAS wrote:

...

hi

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 ?

thanks

raphaël

...

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