Re: [Virtools] TRANSFORMATION LACK 3d to 2d Screen

["David Callele" <callele@cs.usask.ca>]

Hi ,

>From what I can see, there may be two issues:
1) as scene complexity increase, the render rates can drop and you will
experience lag in the position of the interface.
2) I may be wrong here but the BG appears (I didn't have time to go into it
in great detail) to assume a straight line approximation (constant Z depth)
to the position, rather than an arc (constant distance from viewpoint) so
the greater the angle from center, the greater the error.  This is the same
problem that one has with fog effects.

Hope this helps.

David Callele

----- Original Message -----
From: "Till Helmbold" <helmbold@heretogo.com>
To: "Virtools-User-Group (E-mail)"
<virtools-user-group@lists.theswapmeet.com>; <support@virtools.com>;
<dujardin@virtools.com>
Sent: Wednesday, July 18, 2001 10:44 AM
Subject: [Virtools] TRANSFORMATION LACK 3d to 2d Screen


> Hallo from Berlin,
>
> we built a Mouse Following Zooming Interface, a group with 3D Entities,
> Camera & Light.
> We are using the Behav.Graph from the Dev.2.0 Disk called
> "PositionObjectOnMouse"
>
> (our actual step is online at: http://www.heretogo.com/ifsts)
>
> P R O B L E M
>
> Everything is working but we have a divergation. In the
> Top/Right/Left/Buttom Screen Area
> the Mouse is not in the center from the Interface.
>
> We analysed the "PositionObjectOnMouse" Behav.Graph and checked the Unit
> FOV for the Camera
> and the Calculator with the tan function. Is this the reason for the
> divergation at the screen corners?
> In the Screen Center everything is ok.
>
>
>
> V E R Y   I M P O R T A N T   P R O B L E M
>
> Now we have to add to this Interface our Buttons, 2dSprites.
> This Buttons should have a absolut position on the moving interface.
>
> How we can do that?
>
> How we can transform 3d Coordinates from an 3d Object (our Interface) to
> Screen Coordinates?
>
> To give all Buttons a absolut position "on" the Interface without
> divergation?
>
> or:
>
> To move all Buttons in the same way as we moving our Interface
> (3dObject).
>
> Thank You,
>
> Marcus & Till
>
>
>
> .*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.
>
> HereToGo environment
> Till Helmbold
>
> Saarbrueckerstr. 22-24
> D-10405 Berlin
>
> Fon +49(0)30.44.35.97.12
> Fax +49(0)30.44.35.97.14
>
> F L A S H 4 r e q u i r e d !
> http://www.heretogo.com
> mailto:helmbold@heretogo.com
>
> .*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.
>
>
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---

References:

• [Virtools] TRANSFORMATION LACK 3d to 2d Screen
• From: Till Helmbold <helmbold@heretogo.com>

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