Java 3D gurus, can you help me....
I have developed a small J3D application which displays a marine structure
in a given seaway. The application is a basic media player which alters the
marine structure and wave-carpet through time, while allowing the user to
transform the view (independent of the dynamically changing scene).
Everything seems to work fine, except for two buttons which allow the user
to 'zoom in and out' of the scene. (This is also done with a mouse
behaviour which works fine, but I decided to include zoom buttons for users
without a 3 button mouse).
My scene-graph is as follows:
ROOT
/ \
scale lighting etc
|
transMouse (TG)
/ \
waveTransformG boatTransformG
| |
wave(shape3D) boat(shape3D)
When the user clicks on zoom-in or out button I get the mouse behaviour's
transform matrix, alter the translation of the matrix, and re-set it.
This, however, SOMETIMES changes the rotation, giving an undesirable view.
I cannot understand why this is happening. Am I doing something
fundamentally wrong?
The method which changes the translation is as follows (I'm new to JAVA, so
excuse bad style):
public void zoomIn(float zoomAmount){
Transform3D transTemp = new Transform3D();
Matrix3f tempRotationMatrix = new Matrix3f();
Vector3f tempTranslationVector = new Vector3f();
float[] tempTranslationArray = new float[3];
transMouse.getTransform(transTemp);
transTemp.get(tempRotationMatrix, tempTranslationVector);
tempTranslationVector.get(tempTranslationArray);
tempTranslationArray[2] = tempTranslationArray[2] + zoomAmount;
tempTranslationVector.set(tempTranslationArray);
transTemp.set(tempRotationMatrix, tempTranslationVector, 1.0f);
transMouse.setTransform(transTemp);
}
Is this the incorrect way of doing this?...Any ideas or suggestions would be
most welcome.
If you want to see where the application is going wrong you can download it
from:
http://www.wsatkins.co.uk/asas-aqwa/download/aqwa_sequence_java_download.htm
Much appreciated,
Andy Phelps
===============================================================
WS Atkins Engineering Software
Woodcote Grove
Ashley Road Tel: +44 (0)1372 726 140
Epsom Fax: +44 (0)1372 740 055
Surrey URL:
http://www.wsatkins.co.uk/wsa/core-pages/software.htm
KT18 5BW E-mail: [EMAIL PROTECTED]
England
===============================================================
date sent: 01/04/99 16:29 (QA purposes)
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