That worked very well.
Danke fur ihre Hilfe.
Daryle.
-----Original Message-----
From: Thomas Auinger <[EMAIL PROTECTED]>
To: Discussion list for Java 3D API <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Monday, July 05, 1999 6:50 PM
Subject: Re: [JAVA3D] Setting the direction /orientation of the
Viewplatformobject
>
>
>> Daryle Singh schrieb:
>>
>> Hi all,
>> I am trying to develop an application which allows the user to cruise
>> over an object,
>> as if they were in a helicopter.I can move the position of the
>> VIEWPLATFORM
>> but I cannot set the direction.(So that they are continually looking
>> down on the object
>> from whatever position they may be in) I know that the TRANSFORM3D
>> object has a method
>> called LookAT.This apparently is how you set the direction of the
>> view.
>
>Transform3D.lookAt(Point3d eye,
> Point3d center,
> Vector3d up)
>
>is fine. Just remember, to INVERT the transform before
>assigning it to the TransformGroup, that holds your ViewPlatform.
>
>Following is a code snipplet I use to have the camera move in
>a circle while always looking the the circle center:
>
> public void calcViewpoint()
> { Transform3D viewpoint = new Transform3D();
> // 'angle' describes the current position on the circle
> // while 'distance' is the circle's radius.
> double eyeX = Math.cos(angle) * distance,
> eyeZ = Math.sin(angle) * distance;
> Point3d eyeLocation = new Point3d(eyeX, 0.0d, eyeZ);
> Point3d lookingAt = new Point3d(0.0d, 0.0d, 0.0d);
> Vector3d up = new Vector3d(0.0d, 1.0d, 0.0d);
> viewpoint.lookAt(eyeLocation, lookingAt, up);
> viewpoint.invert();
>
> viewTransformGroup.setTransform(viewpoint);
> }
>
>Cheers, Thomas
>
>> Has anybody had any experience using this method? any example code
>> would
>> be appreciated.
>>
>>
>>
>>
>> Thanks
>> Daryle
>
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