public void EvaluateInputRange(out Vector4 start, out Vector4 end)
{
var r = Channel1.EvaluateInputRange();
var g = Channel2.EvaluateInputRange();
var b = Channel3.EvaluateInputRange();
var a = Channel4.EvaluateInputRange();
start = new Vector4(r.x, g.x, b.x, a.x);
end = new Vector4(r.y, g.y, b.y, a.y);
}
