diff --git a/shaders.txt b/shaders.txt
index 1d3148df..0754d1d6 100644
--- a/shaders.txt
+++ b/shaders.txt
@@ -31,6 +31,6 @@ shaders:
     name: no_transparency
     colorscheme: default
     transparency: false
-    
-    
-    
\ No newline at end of file
+  
+  - class: org.dynmap.hdmap.CaveHDShader
+    name: cave
diff --git a/src/main/java/org/dynmap/hdmap/CaveHDShader.java b/src/main/java/org/dynmap/hdmap/CaveHDShader.java
new file mode 100644
index 00000000..437a3b1d
--- /dev/null
+++ b/src/main/java/org/dynmap/hdmap/CaveHDShader.java
@@ -0,0 +1,184 @@
+package org.dynmap.hdmap;
+
+import static org.dynmap.JSONUtils.s;
+import org.bukkit.block.Biome;
+import org.dynmap.Color;
+import org.dynmap.ColorScheme;
+import org.dynmap.ConfigurationNode;
+import org.dynmap.utils.MapChunkCache;
+import org.dynmap.utils.MapIterator;
+import org.json.simple.JSONObject;
+
+public class CaveHDShader implements HDShader {
+    private String name;
+
+    
+    public CaveHDShader(ConfigurationNode configuration) {
+        name = (String) configuration.get("name");
+    }
+    
+    @Override
+    public boolean isBiomeDataNeeded() { 
+        return false; 
+    }
+    
+    @Override
+    public boolean isRawBiomeDataNeeded() { 
+        return false; 
+    }
+    
+    @Override
+    public boolean isHightestBlockYDataNeeded() {
+        return false;
+    }
+
+    @Override
+    public boolean isBlockTypeDataNeeded() {
+        return true;
+    }
+
+    @Override
+    public boolean isSkyLightLevelNeeded() {
+        return false;
+    }
+
+    @Override
+    public boolean isEmittedLightLevelNeeded() {
+        return false;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+    
+    private class OurShaderState implements HDShaderState {
+        private Color color;
+        protected MapIterator mapiter;
+        protected HDMap map;
+        private boolean air;
+        
+        private OurShaderState(MapIterator mapiter, HDMap map) {
+            this.mapiter = mapiter;
+            this.map = map;
+            this.color = new Color();
+        }
+        /**
+         * Get our shader
+         */
+        public HDShader getShader() {
+            return CaveHDShader.this;
+        }
+
+        /**
+         * Get our map
+         */
+        public HDMap getMap() {
+            return map;
+        }
+        
+        /**
+         * Get our lighting
+         */
+        public HDLighting getLighting() {
+            return map.getLighting();
+        }
+        
+        /**
+         * Reset renderer state for new ray
+         */
+        public void reset(HDPerspectiveState ps) {
+            color.setTransparent();
+            air = true;
+        }
+        
+        /**
+         * Process next ray step - called for each block on route
+         * @return true if ray is done, false if ray needs to continue
+         */
+        public boolean processBlock(HDPerspectiveState ps) {
+            int blocktype = ps.getBlockTypeID();
+            switch (blocktype) {
+                case 0:
+                case 20:
+                case 18:
+                case 17:
+                case 78:
+                case 79:
+                    break;
+                default:
+                    air = false;
+                    return false;
+            }
+            if (!air) {
+                int cr, cg, cb;
+                int mult = 256;
+
+                if (mapiter.getY() < 64) {
+                    cr = 0;
+                    cg = 64 + mapiter.getY() * 3;
+                    cb = 255 - mapiter.getY() * 4;
+                } else {
+                    cr = (mapiter.getY() - 64) * 4;
+                    cg = 255;
+                    cb = 0;
+                }
+                /* Figure out which color to use */
+                switch(ps.getLastBlockStep()) {
+                    case X_PLUS:
+                    case X_MINUS:
+                        mult = 224;
+                        break;
+                    case Z_PLUS:
+                    case Z_MINUS:
+                        mult = 256;
+                        break;
+                    default:
+                        mult = 160;
+                        break;
+                }
+                cr = cr * mult / 256;
+                cg = cg * mult / 256;
+                cb = cb * mult / 256;
+
+                color.setRGBA(cr, cg, cb, 255);
+                return true;
+            }
+            return false;
+        }        
+        /**
+         * Ray ended - used to report that ray has exited map (called if renderer has not reported complete)
+         */
+        public void rayFinished(HDPerspectiveState ps) {
+        }
+        /**
+         * Get result color - get resulting color for ray
+         * @param c - object to store color value in
+         * @param index - index of color to request (renderer specific - 0=default, 1=day for night/day renderer
+         */
+        public void getRayColor(Color c, int index) {
+            c.setColor(color);
+        }
+        /**
+         * Clean up state object - called after last ray completed
+         */
+        public void cleanup() {
+        }
+    }
+
+    /**
+     *  Get renderer state object for use rendering a tile
+     * @param map - map being rendered
+     * @param cache - chunk cache containing data for tile to be rendered
+     * @param mapiter - iterator used when traversing rays in tile
+     * @return state object to use for all rays in tile
+     */
+    public HDShaderState getStateInstance(HDMap map, MapChunkCache cache, MapIterator mapiter) {
+        return new OurShaderState(mapiter, map);
+    }
+    
+    /* Add shader's contributions to JSON for map object */
+    public void addClientConfiguration(JSONObject mapObject) {
+        s(mapObject, "shader", name);
+    }
+}
diff --git a/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java b/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java
index d4d96c1f..4b766f50 100644
--- a/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java
+++ b/src/main/java/org/dynmap/hdmap/IsoHDPerspective.java
@@ -575,9 +575,10 @@ public class IsoHDPerspective implements HDPerspective {
         mapiter.initialize(x, y, z);
         ps.skylightlevel = 15;
         ps.emittedlightlevel = 0;
+        boolean nonairhit = false;
         for (; n > 0; --n) {
             ps.blocktypeid = mapiter.getBlockTypeID();
-            if(ps.blocktypeid != 0) {
+            if(nonairhit || (ps.blocktypeid != 0)) {
                 ps.blockdata = mapiter.getBlockData();
                 boolean done = true;
                 for(int i = 0; i < shaderstate.length; i++) {
@@ -588,6 +589,7 @@ public class IsoHDPerspective implements HDPerspective {
                 /* If all are done, we're out */
                 if(done)
                     return;
+                nonairhit = true;
             }
             if(need_skylightlevel)
                 ps.skylightlevel = mapiter.getBlockSkyLight();