From b8bae923ecdd273c41363593da466d62bb798644 Mon Sep 17 00:00:00 2001
From: "Sascha L. Teichmann" <sascha.teichmann@intevation.de>
Date: Sun, 26 Oct 2014 20:39:53 +0100
Subject: [PATCH] Prevent stopping depth scanning too early when handling
 transparent nodes.

---
 common/renderer.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/common/renderer.go b/common/renderer.go
index 29017c9..af8f64f 100644
--- a/common/renderer.go
+++ b/common/renderer.go
@@ -224,12 +224,13 @@ func (r *Renderer) RenderBlock(block *Block, colors *Colors) (err error) {
 				if currentY < blockY {
 					for y := 15; y >= 0; y-- {
 						if c, ok := db.Content(x, y, z); ok {
-							currentY = blockY + int32(y)
+							cY := blockY + int32(y)
 
 							if colors.IsTransparent(c) {
-								r.tBuffer[ofs] = r.spans.Insert(r.tBuffer[ofs], currentY, c)
+								r.tBuffer[ofs] = r.spans.Insert(r.tBuffer[ofs], cY, c)
 							} else {
 								r.cBuffer[ofs] = c
+								currentY = cY
 								yB[ofs] = currentY
 								break
 							}