Bug about camera matrix

Bugs
1

Hi everybody,

I noticed a bug since BABYLON Version 8.22.3.

Here’s what happens :

Version 8.22.1 :

2025-09-10_09h29_26

The zoom is working perfectly (item 15 of the camera matrix)

Actual version :

2025-09-10_09h30_24

Nothing is working.

Here’s the code in the slider function (num is the float returned by the slider):

updateScale(num) {
        // Récupère la matrice de projection de la caméra active
        var matrixia = scene.activeCamera.getProjectionMatrix();

        // Met à jour l'élément m[15] de la matrice avec le paramètre num
        matrixia._m[15] = num;

        // Applique les modifications à la matrice de projection de la caméra active
        scene.activeCamera.getProjectionMatrix().setRow(0, matrixia.getRow(0));
        scene.activeCamera.getProjectionMatrix().setRow(1, matrixia.getRow(1));
        scene.activeCamera.getProjectionMatrix().setRow(2, matrixia.getRow(2));
        scene.activeCamera.getProjectionMatrix().setRow(3, matrixia.getRow(3));

What happens in the last version :

Matrixia._m[15] = 0 when i’m looking at the console. So the zoom is not working any more. I tried to have a look with a PG but i did not manage to reproduce the bug.

If anyone could help me…

Thanks,

Boris

2

This is unfortunately impossible to tell without a repro as I do not remember any changes on our matrices recently.

3

cc @georgie our new Camera overlord