_Camera2World different between platforms?

Unity Engine
1

Is it possible that platforms use different coordinate space directions?

I’m using a custom billboard shader that uses a global _Camera2World which is set using a script on the camera like this:

void Update () {
Shader.SetGlobalMatrix (“_Camera2World”, this.camera.cameraToWorldMatrix );
}

Everything looks fine on PC / Mac, but on iOS / Android it appears flipped (what i believe) all 3 axes.

This is the only shader that requires the matrix, and also the only one that is flipped, so that is how i arrived it being somewhere in this code.

Anything going on behind the scenes? Thanks!

2

Some platform are column-major, other are row major.

some platform have a matrix of the form :

ABCX
ABCY
ABCZ
0001

other

AAA0
BBB0
CCC0
XYZ1

So on GL plateform, just transpose the matrix before passing it.

3

Thanks Guillaume, that sheds some light. Does this mean that Unity’s matrices differ from ES 2.0 GL?
Because the phone is calcuating the _Camera2World in Unity, which is being passed as Float4x4 into the shader which then does a matrix operation.

Also, this might also be a hint as to why Unity’s builtin-values do not include _Camera2World?