private void BtnQuadrado_Click(object sender, EventArgs e)
{
Quadrado obj = new Quadrado();
obj.Pos = PosAleatorio();
var rnd = new Random(Environment.TickCount);
obj.Mat_render.CorBorda = new RGBA((byte)rnd.Next(0, 255), (byte)rnd.Next(0, 255), (byte)rnd.Next(0, 255), (byte)rnd.Next(0, 255));
obj.Mat_render.CorSolida = new RGBA((byte)rnd.Next(0, 255), (byte)rnd.Next(0, 255), (byte)rnd.Next(0, 255), (byte)rnd.Next(0, 255));
obj.GerarGeometria(45, raio_padrao);
engine2D.AddObjeto(obj);
AtualizarComboObjetos2D();
cboObjeto2D.SelectedValue = obj;
}