diff --git a/contour_layer.go b/contour_layer.go
index 18d2171..b8ce1aa 100644
--- a/contour_layer.go
+++ b/contour_layer.go
@@ -62,13 +62,13 @@ func (s *ContourLayer) Update(env *Env, g *sg.Graphics) {
 }
 
 func (s *ContourLayer) Draw(env *Env, g *sg.Graphics) {
-	//g.BeginAdditiveBlend()
+	g.BeginAdditiveBlend()
 	for _, actor := range s.actors {
 		if actor != nil {
 			actor.Draw(env, g)
 		}
 	}
-	//g.EndBlend()
+	g.EndBlend()
 }
 
 func (s *ContourLayer) IsDirty() bool {
@@ -92,7 +92,8 @@ func (a *Actor) Draw(env *Env, g *sg.Graphics) {
 
 	g.SetStrokeWeight(1.0)
 	g.SetStroke(true)
-	g.SetStrokeColor(a.color)
+	c := a.color
+	c.A = 255
 	g.DrawLine(a.position, nextPosition)
 	//rl.DrawLineV(a.position, nextPosition, a.color)
 	a.position = nextPosition