diff --git a/tilemapper/renderer.go b/tilemapper/renderer.go
index f79e522..22bac7a 100644
--- a/tilemapper/renderer.go
+++ b/tilemapper/renderer.go
@@ -24,10 +24,6 @@ type Renderer struct {
 	Rejected int
 }
 
-const (
-	invalid = math.MinInt32 + 1
-)
-
 func NewRenderer(xOfs, zOfs int16, width, height int) (renderer *Renderer) {
 	dim := width * height
 	pixSize := dim * 16 * 16
@@ -68,7 +64,6 @@ func (r *Renderer) RenderBlock(block *common.Block, nameIndex map[string]int32)
 	// is already filled and the block is strictly below.
 	blockY := int32(block.Coord.Y) << 4
 	pos := int(bz)*r.width + int(bx)
-	//fmt.Printf("pos: %d %d\n", pos, len(r.yMin))
 	if blockY < r.yMin[pos] {
 		r.Rejected++
 		return
@@ -131,12 +126,14 @@ func (r *Renderer) CreateImage(colors []color.RGBA, background color.RGBA) *imag
 }
 
 func safeColor(x int32) uint8 {
-	if x < 0 {
-		x = 0
-	} else if x > 255 {
-		x = 255
+	switch {
+	case x < 0:
+		return 0
+	case x > 255:
+		return 255
+	default:
+		return uint8(x)
 	}
-	return uint8(x)
 }
 
 func (r *Renderer) CreateShadedImage(colors []color.RGBA, background color.RGBA) *image.RGBA {