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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there is a rough version of a viewpoint/world controlling object. it has 2 modes, one allows you to move like in a 3d game world and the other one lets you interact like in a modelling program like maya. (I am not sure if it works on windows, though...) you interact with mouse and ctrl/alt in your gemwin. http://www.parasitaere-kapazitaeten.net/Pd/advcam if you want to do something more basic, have a look at the helpfile for gemwin. the viewing vector is
- camera location (xyz). that is the position of your camera
- viewing point (xyz). that is where you look at
- up vector (XYZ). that will tell the camera where "up" is. think of the
last one as when you are piloting an airplain that turns around its length axis. the airplain position and the viewing point postion is not enough information to tell where "up" is... by default "up vector" is 0 1 0. (pointing "upward" along the y axis). then use something like [viewpoint 0 0 10 0 0 0 0 1 0( as a message to gemwin. marius.
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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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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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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-
marius schebella -
Raphaël ILIAS -
Roman Haefeli