Rotate in thinInstanceSetBuffer

with createInstance I was able to successfully rotate instance like:

var railingRight = _addInstance(railing, 'railingRight' + i, -80, 0, 20);
railingRight.rotate(BABYLON.Axis.Y, 1.57, BABYLON.Space.WORLD);
        var _addInstance = function (m, n, x, y, z) {
            var i = m.createInstance(n);
            i.position.x = x || 0;
            i.position.y = y || 0;
            i.position.z = z || 0;
            return i;

how to rotate single box when using thinInstanceSetBuffer

You have to create a new (or update an existing) matrix and update the buffer:


Thank @Evgeni_Popov , so if I understood correctly

BABYLON.Matrix.Compose(scale, rot, trans).copyToArray(bufferMatrices, 0);

that copyToArray is updating an existing array indexes and also creating, so for example in this snippet

I removed matrix1 and just used Matrix.Compose to create buffer, this way I am not calling multiple times,
or this way too:

is that correct?

Yes it is.

A thin instance is simply a matrix that let you position your instance wherever you want.

1 Like

Thank you for confirmation, such a wonderful community , happy to be here.