thanks so much! i'll try that. vamshi ----- Original Message ----- From: "Dipl. Ing. Paul Szawlowski" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 15, 2002 1:39 PM Subject: Re: [JAVA3D] problem setting color - some details
> vamshi raghu schrieb: > > > * why does the scene dissappear after a certain > > z - distance ? can I change this? > > Try to change the back clipping plane in the View class: > > Projection and Clip Parameters > > The projection and clip parameters determine the view model's field of view and > the front and back clipping distances. > > * Field of view - specifies the view model's horizontal field of view in > radians, when in the default non-head-tracked mode. This value is ignored when > the view model is operating in head-tracked mode, or when the Canvas3D's window > eyepoint policy is set to a value other than the default setting of > RELATIVE_TO_FIELD_OF_VIEW. > > * Front clip distance - specifies the distance away from the clip origin, > specified by the front clip policy variable, in the direction of gaze where > objects stop disappearing. Objects closer than the clip origin (eye or screen) > plus the front clip distance are not drawn. Measurements are done in the space > (physical or virtual) that is specified by the associated front clip policy > parameter. > > * Back clip distance - specifies the distance away from the clip origin > (specified by the back clip policy variable) in the direction of gaze where > objects begin disappearing. Objects farther away from the clip origin (eye or > screen) plus the back clip distance are not drawn. Measurements are done in the > space (physical or virtual) that is specified by the associated back clip > policy parameter. The View object's back clip distance is ignored if the scene > graph contains an active Clip leaf node. > > There are several considerations to take into account when choosing > values for the front and back clip distances. > > * The front clip distance must be greater than 0.0 in physical eye > coordinates. > > * The front clipping plane must be in front of the back clipping > plane, that is, the front clip distance must be less than the back clip > distance in physical eye coordinates. > > * The front and back clip distances, in physical eye coordinates, > must be less than the largest positive single-precision floating point value, > Float.MAX_VALUE. In practice, since these physical eye coordinate distances are > in meters, the values should be much less than that. > > * The ratio of the back distance divided by the front distance, in > physical eye coordinates, affects Z-buffer precision. This ratio should be less > than about 3000 to accommodate 16-bit Z-buffers. Values of 100 to less than > 1000 will produce better results. > > Violating any of the above rules will result in undefined behavior. In many > cases, no picture will be drawn. > > =========================================================================== > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff JAVA3D-INTEREST". For general help, send email to > [EMAIL PROTECTED] and include in the body of the message "help". =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
