Matrix multiplication scaling weird values

Unity Engine
, , ,
1

I’m doing some matrix multiplication and the scaling seems weird.

                v[0] = new(-0.5f, +0.5f, -0.5f);
                v[1] = new(-0.5f, +0.5f, +0.5f);
                v[2] = new(+0.5f, +0.5f, +0.5f);
                v[3] = new(+0.5f, +0.5f, -0.5f);
                for(int i = 0; i < 4; i++) { 
                    Vector3 n = translation.MultiplyPoint3x4(v[i]); 
                            n += rotation.MultiplyPoint3x4(v[i]); 
                            n += scale.MultiplyPoint3x4(v[i]);
                            MB.mesh.verts.Write<Vector3>(new(x + n.x, y + n.y, z + n.z)); 
                }

The scaling always seems to triple the value.

            Matrix4x4 translation = Matrix4x4.Translate(new(0, 0, 0));
            Matrix4x4 rotation = Matrix4x4.Rotate(Quaternion.Euler(0, r, 0));
            Matrix4x4 scale = Matrix4x4.Scale(new(-1, -1, -1));
            if (MB.transforms.ContainsKey(ID)) {
                MB.transforms.TryGetValue(ID, out Dev.Component.Transform tr);
                translation = Matrix4x4.Translate(tr.position);
                rotation = Matrix4x4.Rotate(Quaternion.Euler(tr.rotation.x, tr.rotation.y, tr.rotation.z));
                scale = Matrix4x4.Scale(tr.scale);
            }

It only stays the same when I use -1. Is there a specific order we need to do the matrix multiplication in? Or a way to do all 3 at once?

2

TRS

3

Thx zulo, switching to that fixed it.