Hi Tina,
>X-Unix-From: [EMAIL PROTECTED] Tue Jul 3 08:24:33 2001
>Delivered-To: [EMAIL PROTECTED]
>X-Sender: ceetm2@odin
>MIME-Version: 1.0
>Date: Tue, 3 Jul 2001 16:24:16 +0100
>From: Tina Manoharan Valappil <[EMAIL PROTECTED]>
>Subject: [JAVA3D] Non-Congruent Transform Error !!
>To: [EMAIL PROTECTED]
>
> Hello,
>
> Please help me with this error!
>
> This is what I want to do. While the user navigates (either mouse
> or keyboard), if he presses the button "Ground" only his
> position and y-rotation values should remain. In other words I want
> to put him back exactly on the ground (Tx, 0.5, Tz) with only
> rotation about the y-axis.
>
> This is what I am doing:
>
> original matrix: final matrix:
>
> Rx1 Rx2 Rx3 Tx Rx1 0 Rx3 Tx
> Ry1 Ry2 Ry3 Ty 0 1 0 0.5
> Rz1 Rz2 Rz3 Tz Rz1 0 Rz3 Tz
> 0 0 0 1 0 0 0 1
>
> But when I do this, I get non-congruent transform exception.
>
> can someone give me an idea as to how I can do this Please!
>
> Tina
>
Congruent Transform require that
(i) dot produce of any two column vector is zero (orthogonal)
(ii) x,y,z scale are the same.
In this case, although
Rx1*Rx3 + Ry1*Ry3 + Rz1*Rz3 = 0 holds in the original matrix
Rx1*Rx3 + Rz1*Rz3 may not equal to 0 in the final matrix
Thus the first condition did not satisify.
Also for the second condition imply that in the final
matrix:
(sqaure sum of 1st col) (2nd col) (3rd col)
Rx1*Rx1 + Rz1*Rz1 == 1 == Rx3*Rx3 + Rz3*Rz3
- Kelvin
------------------
Java 3D Team
Sun Microsystems Inc.
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