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  View and background (awfull crash)  (Read 879 times)
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Offline aschwalb

Senior Newbie




Java games rock!


« Posted 2004-06-14 12:37:42 »

Hello

(Excuse me, my english are not the best.)
From class View, method getBackgroundTransform()
i always got a SingularMatrixException.
I only use orthogonal matrixes,  so that an
inverted matrix can't be singulär.
The exception occurs mostly, if a have rotated to
a angle of PI (3,14..).
On this angle (or nearby) also the 'FieldOfView' for the
background changes dramatically
The code (from Xiith3d) is:

Quat4f rot = new Quat4f();
Matrix4f translateMatrix = new Matrix4f();
Matrix4f rotMatrix = new Matrix4f();

public Transform3D getBackgroundTransform()
{
       rotMatrix.setIdentity();
       translateMatrix.setIdentity();

       getTransform().get(rot);
       rotMatrix.set(rot);
       // Why that?Huh?
       translateMatrix.set(new Vector3f(0, 4f, 0));
       rotMatrix.mul(translateMatrix);

       backgroundTransform.set(rotMatrix);
       // I know, if the determinant from rotMatrix
       // is zero, there is no inverted matrix from rotMatrix
       // If rotMatrix a product from 2 orthogonal
       // matrixes, how it is possible, that rotMatrix
       // can have a determinant that is zero???  
       backgroundTransform.invert();
       backgroundTransform.transpose();
       return backgroundTransform;
   }

Is there another solution for that problem???
What can i do?? Or have i overseen something??
That problem occurs only, if i use a background.



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