diff --git a/src/java/com/threerings/cast/CharacterSprite.java b/src/java/com/threerings/cast/CharacterSprite.java
index 66856ba4e..ecfe9b486 100644
--- a/src/java/com/threerings/cast/CharacterSprite.java
+++ b/src/java/com/threerings/cast/CharacterSprite.java
@@ -1,12 +1,12 @@
 //
-// $Id: CharacterSprite.java,v 1.9 2001/09/13 19:10:26 mdb Exp $
+// $Id: CharacterSprite.java,v 1.10 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.scene;
 
 import com.threerings.media.sprite.*;
-import com.threerings.media.tile.Tile;
 
 import com.threerings.miso.Log;
+import com.threerings.miso.tile.MisoTile;
 
 /**
  * An <code>AmbulatorySprite</code> is a sprite that can face in one of
@@ -48,7 +48,7 @@ public class AmbulatorySprite extends Sprite implements Traverser
         setFrames(_anims[_orient]);
     }
 
-    public boolean canTraverse (Tile tile)
+    public boolean canTraverse (MisoTile tile)
     {
 	// by default, passability is solely the province of the tile
 	return tile.passable;
diff --git a/src/java/com/threerings/media/tile/Tile.java b/src/java/com/threerings/media/tile/Tile.java
index 15891cde0..00242ed33 100644
--- a/src/java/com/threerings/media/tile/Tile.java
+++ b/src/java/com/threerings/media/tile/Tile.java
@@ -1,5 +1,5 @@
 //
-// $Id: Tile.java,v 1.12 2001/09/28 01:24:27 mdb Exp $
+// $Id: Tile.java,v 1.13 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.media.tile;
 
@@ -25,9 +25,6 @@ public class Tile
     /** The tile height in pixels. */
     public short height;
 
-    /** Whether the tile is passable. */
-    public boolean passable;
-
     /**
      * Construct a new tile with the specified identifiers.  Intended
      * only for use by the <code>TileSet</code>.  Do not call this
diff --git a/src/java/com/threerings/media/tile/TileSet.java b/src/java/com/threerings/media/tile/TileSet.java
index 567ef3a0a..db5e37ade 100644
--- a/src/java/com/threerings/media/tile/TileSet.java
+++ b/src/java/com/threerings/media/tile/TileSet.java
@@ -1,5 +1,5 @@
 //
-// $Id: TileSet.java,v 1.15 2001/08/30 01:13:08 shaper Exp $
+// $Id: TileSet.java,v 1.16 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.media.tile;
 
@@ -26,25 +26,9 @@ public class TileSet
     /**
      * Construct a new <code>TileSet</code> object.
      */
-    public TileSet (
-	String name, int tsid, String imgFile,
-	int[] rowWidth, int[] rowHeight, int[] tileCount, int[] passable,
-	Point offsetPos, Point gapDist)
+    public TileSet ()
     {
-	_name = name;
-	_tsid = tsid;
-	_imgFile = imgFile;
-        _rowWidth = rowWidth;
-	_rowHeight = rowHeight;
-	_tileCount = tileCount;
-	_passable = passable;
-        _offsetPos = offsetPos;
-        _gapDist = gapDist;
-
-	// determine the total number of tiles in the set
-	for (int ii = 0; ii < _tileCount.length; ii++) {
-	    _numTiles += _tileCount[ii];
-	}
+	_model = new TileSetModel();
     }
 
     /**
@@ -52,7 +36,7 @@ public class TileSet
      */
     public int getId ()
     {
-	return _tsid;
+	return _model.tsid;
     }
 
     /**
@@ -60,7 +44,7 @@ public class TileSet
      */
     public String getName ()
     {
-	return _name;
+	return _model.name;
     }
 
     /**
@@ -68,7 +52,7 @@ public class TileSet
      */
     public int getNumTiles ()
     {
-	return _numTiles;
+	return _model.numTiles;
     }
 
     /**
@@ -84,9 +68,9 @@ public class TileSet
     {
 	// load the full tile image if we don't already have it
 	if (_imgTiles == null) {
-	    if ((_imgTiles = imgmgr.getImage(_imgFile)) == null) {
+	    if ((_imgTiles = imgmgr.getImage(_model.imgFile)) == null) {
 		Log.warning("Failed to retrieve full tileset image " +
-			    "[file=" + _imgFile + "].");
+			    "[file=" + _model.imgFile + "].");
 		return null;
 	    }
 	}
@@ -96,19 +80,19 @@ public class TileSet
 	ridx = tcount = 0;
 
         // start tile image position at image start offset
-        tx = _offsetPos.x;
-        ty = _offsetPos.y;
+        tx = _model.offsetPos.x;
+        ty = _model.offsetPos.y;
 
-	while ((tcount += _tileCount[ridx]) < tid + 1) {
+	while ((tcount += _model.tileCount[ridx]) < tid + 1) {
             // increment tile image position by row height and gap distance
-	    ty += (_rowHeight[ridx++] + _gapDist.y);
+	    ty += (_model.rowHeight[ridx++] + _model.gapDist.y);
 	}
 
         // determine the horizontal index of this tile in the row
-	int xidx = tid - (tcount - _tileCount[ridx]);
+	int xidx = tid - (tcount - _model.tileCount[ridx]);
 
         // final image x-position is based on tile width and gap distance
-        tx += (xidx * (_rowWidth[ridx] + _gapDist.x));
+        tx += (xidx * (_model.rowWidth[ridx] + _model.gapDist.x));
 
 //          Log.info("Retrieving tile image [tid=" + tid + ", ridx=" +
 //                   ridx + ", xidx=" + xidx + ", tx=" + tx +
@@ -116,7 +100,7 @@ public class TileSet
 
 	// crop the tile-sized image chunk from the full image
 	return imgmgr.getImageCropped(
-            _imgTiles, tx, ty, _rowWidth[ridx], _rowHeight[ridx]);
+            _imgTiles, tx, ty, _model.rowWidth[ridx], _model.rowHeight[ridx]);
     }
 
     /**
@@ -133,18 +117,18 @@ public class TileSet
     public Tile getTile (ImageManager imgmgr, int tid)
     {
 	// bail if there's no such tile
-	if (tid > (_numTiles - 1)) {
+	if (tid > (_model.numTiles - 1)) {
 	    return null;
 	}
 
 	// create the tile object
-	Tile tile = new Tile(_tsid, tid);
+	Tile tile = createTile(tid);
 
 	// retrieve the tile image
 	tile.img = getTileImage(imgmgr, tid);
 	if (tile.img == null) {
 	    Log.warning("Null tile image " +
-			"[tsid=" + _tsid + ", tid=" + tid + "].");
+			"[tsid=" + _model.tsid + ", tid=" + tid + "].");
 	}
 
 	// populate the tile's dimensions
@@ -152,61 +136,94 @@ public class TileSet
 	tile.height = (short)bimg.getHeight();
         tile.width = (short)bimg.getWidth();
 
-	// and its passability
-	tile.passable = (_passable[tid] == 1);
-
 	return tile;
     }
 
+    /**
+     * Returns the tile set model.
+     */
+    public TileSetModel getModel ()
+    {
+	return _model;
+    }
+
     /**
      * Return a string representation of the tileset information.
      */
     public String toString ()
     {
-	StringBuffer buf = new StringBuffer();
-	buf.append("[name=").append(_name);
-	buf.append(", file=").append(_imgFile);
-	buf.append(", tsid=").append(_tsid);
-	buf.append(", numtiles=").append(_numTiles);
-	return buf.append("]").toString();
+	return _model.toString();
     }
 
-    /** The tileset name. */
-    protected String _name;
-
-    /** The file containing the tile images. */
-    protected String _imgFile;
-
-    /** The tileset unique identifier. */
-    protected int _tsid;
-
-    /** The width of the tiles in each row in pixels. */
-    protected int _rowWidth[];
-
-    /** The height of each row in pixels. */
-    protected int _rowHeight[];
-
-    /** The number of tiles in each row. */
-    protected int _tileCount[];
-
-    /** Whether each tile is passable. */
-    protected int _passable[];
-
     /**
-     * The offset distance (x, y) in pixels from the top-left of the
-     * image to the start of the first tile image.
+     * Construct and return a new tile object for further population
+     * with tile-specific information.
      */
-    protected Point _offsetPos;
-
-    /**
-     * The distance (x, y) in pixels between each tile in each row
-     * horizontally, and between each row of tiles vertically.
-     */
-    protected Point _gapDist;
-
-    /** The total number of tiles. */
-    protected int _numTiles;
+    protected Tile createTile (int tid)
+    {
+	return new Tile(_model.tsid, tid);
+    }
 
     /** The image containing all tile images for this set. */
     protected Image _imgTiles;
+
+    /** The tile set data model. */
+    protected TileSetModel _model;
+
+    /**
+     * The model that details the attributes of each tile in a
+     * tileset.  Storing the data separately from the tile set object
+     * itself allows for the wealth of information associated with a
+     * tile set to be more cleanly gathered and passed on to the tile
+     * set constructor by those that need to do so.
+     */
+    public static class TileSetModel
+    {
+	/** The tileset name. */
+	public String name;
+
+	/** The tileset unique identifier. */
+	public int tsid;
+
+	/** The file containing the tile images. */
+	public String imgFile;
+
+	/** The width of the tiles in each row in pixels. */
+	public int[] rowWidth;
+
+	/** The height of the tiles in each row in pixels. */
+	public int[] rowHeight;
+
+	/** The number of tiles in each row. */
+	public int[] tileCount;
+
+	/** The number of tiles in the tileset. */
+	public int numTiles;
+
+	/**
+	 * The offset distance (x, y) in pixels from the top-left of the
+	 * image to the start of the first tile image.
+	 */
+	public Point offsetPos = new Point();
+
+	/**
+	 * The distance (x, y) in pixels between each tile in each row
+	 * horizontally, and between each row of tiles vertically.
+	 */
+	public Point gapDist = new Point();
+
+	public TileSetModel ()
+	{
+	}
+
+	public String toString ()
+	{
+	    StringBuffer buf = new StringBuffer();
+	    buf.append("[name=").append(name);
+	    buf.append(", file=").append(imgFile);
+	    buf.append(", tsid=").append(tsid);
+	    buf.append(", numtiles=").append(numTiles);
+	    return buf.append("]").toString();
+	}
+    }
 }
diff --git a/src/java/com/threerings/media/tile/XMLTileSetParser.java b/src/java/com/threerings/media/tile/XMLTileSetParser.java
index 140535870..3bf64ca17 100644
--- a/src/java/com/threerings/media/tile/XMLTileSetParser.java
+++ b/src/java/com/threerings/media/tile/XMLTileSetParser.java
@@ -1,5 +1,5 @@
 //
-// $Id: XMLTileSetParser.java,v 1.14 2001/09/27 18:43:08 shaper Exp $
+// $Id: XMLTileSetParser.java,v 1.15 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.media.tile;
 
@@ -24,16 +24,59 @@ import com.threerings.media.Log;
 public class XMLTileSetParser extends DefaultHandler
     implements TileSetParser
 {
+    /**
+     * This method is called when an element is fully parsed.  The
+     * complete parsed data for the element is passed in the given
+     * string.
+     *
+     * @param qName the element name.
+     * @param str the full parsed data for the element.
+     */
+    protected void finishElement (String qName, String str)
+    {
+	if (qName.equals("imagefile")) {
+	    _model.imgFile = str;
+
+	} else if (qName.equals("rowwidth")) {
+	    _model.rowWidth = StringUtil.parseIntArray(str);
+
+	} else if (qName.equals("rowheight")) {
+	    _model.rowHeight = StringUtil.parseIntArray(str);
+
+	} else if (qName.equals("tilecount")) {
+	    _model.tileCount = StringUtil.parseIntArray(str);
+
+	    // calculate the total number of tiles in the tileset
+	    for (int ii = 0; ii < _model.tileCount.length; ii++) {
+		_model.numTiles += _model.tileCount[ii];
+	    }
+
+	} else if (qName.equals("offsetpos")) {
+            getPoint(str, _model.offsetPos);
+
+        } else if (qName.equals("gapdist")) {
+            getPoint(str, _model.gapDist);
+
+        } else if (qName.equals("tileset")) {
+	    // construct the tileset on tag close and add it to the
+	    // list of tilesets constructed thus far
+	    _tilesets.add(_tset);
+
+	    // prepare to read another tileset object
+	    init();
+	}
+    }
+
     public void startElement (String uri, String localName,
 			      String qName, Attributes attributes)
     {
 	_tag = qName;
 
 	if (_tag.equals("tileset")) {
-	    _info.tsid = getTileSetId(attributes.getValue("tsid"));
+	    _model.tsid = getTileSetId(attributes.getValue("tsid"));
 
 	    String str = attributes.getValue("name");
-	    _info.name = (str == null) ? DEF_NAME : str;
+	    _model.name = (str == null) ? DEF_NAME : str;
 	}
     }
 
@@ -43,42 +86,7 @@ public class XMLTileSetParser extends DefaultHandler
         // for the elements we're tracking at this point, so proceed
         // with saving off element values for use when we construct
         // the tileset object.
-	String str = _chars.toString().trim();
-
-	if (qName.equals("imagefile")) {
-	    _info.imgfile = str;
-
-	} else if (qName.equals("rowwidth")) {
-	    _info.rowwidth = StringUtil.parseIntArray(str);
-
-	} else if (qName.equals("rowheight")) {
-	    _info.rowheight = StringUtil.parseIntArray(str);
-
-	} else if (qName.equals("tilecount")) {
-	    _info.tilecount = StringUtil.parseIntArray(str);
-
-	    // calculate the total number of tiles in the tileset
-	    for (int ii = 0; ii < _info.tilecount.length; ii++) {
-		_info.numtiles += _info.tilecount[ii];
-	    }
-
-	} else if (qName.equals("passable")) {
-	    _info.passable = StringUtil.parseIntArray(str);
-
-	} else if (qName.equals("offsetpos")) {
-            getPoint(str, _info.offsetpos);
-
-        } else if (qName.equals("gapdist")) {
-            getPoint(str, _info.gapdist);
-
-        } else if (qName.equals("tileset")) {
-	    // construct the tileset on tag close and add it to the
-	    // list of tilesets constructed thus far
-	    _tilesets.add(_info.constructTileSet());
-
-	    // prepare to read another tileset object
-	    init();
-	}
+	finishElement(qName, _chars.toString().trim());
 
 	// note that we're not within a tag to avoid considering any
 	// characters during this quiescent time
@@ -132,7 +140,16 @@ public class XMLTileSetParser extends DefaultHandler
     protected void init ()
     {
 	_chars = new StringBuffer();
-	_info = new TileSetInfo();
+	_tset = createTileSet();
+	_model = _tset.getModel();
+    }
+
+    /**
+     * Constructs and returns a new tile set object.
+     */
+    protected TileSet createTileSet ()
+    {
+	return new TileSet();
     }
 
     /**
@@ -182,64 +199,9 @@ public class XMLTileSetParser extends DefaultHandler
     /** Temporary storage of character data while parsing. */
     protected StringBuffer _chars;
 
-    /** Temporary storage of tileset info while parsing. */
-    protected TileSetInfo _info;
+    /** The tile set whose model is populated while parsing. */
+    protected TileSet _tset;
 
-    /**
-     * A class to hold temporary information on a tileset.
-     */
-    class TileSetInfo
-    {
-	/** The tileset name. */
-	public String name;
-
-	/** The tileset id. */
-	public int tsid;
-
-	/** The tileset full image file path. */
-	public String imgfile;
-
-	/** The width of the tiles in each row. */
-	public int[] rowwidth;
-
-	/** The height of the tiles in each row. */
-	public int[] rowheight;
-
-	/** The number of tiles in each row. */
-	public int[] tilecount;
-
-	/** The passability of each tile. */
-	public int[] passable;
-
-	/** The number of tiles in the tileset. */
-	public int numtiles;
-
-	/** The offset position at which tiles begin in the tile image. */
-	public Point offsetpos;
-
-	/** The gap distance between each tile in the tile image. */
-	public Point gapdist;
-
-	public TileSetInfo ()
-	{
-	    offsetpos = new Point();
-	    gapdist = new Point();
-	}	    
-
-	public TileSet constructTileSet ()
-	{
-	    // if passability is unspecified, default to all passable
-	    if (passable == null) {
-		passable = new int[numtiles];
-		for (int ii = 0; ii < numtiles; ii++) {
-		    passable[ii] = 1;
-		}
-	    }
-
-	    // construct a tileset object using all gathered data
-	    return new TileSet(
-		name, tsid, imgfile, rowwidth, rowheight, tilecount,
-		passable, offsetpos, gapdist);
-	}
-    }
+    /** The tile set data model populated while parsing. */
+    protected TileSet.TileSetModel _model;
 }
diff --git a/src/java/com/threerings/miso/client/DisplayMisoSceneImpl.java b/src/java/com/threerings/miso/client/DisplayMisoSceneImpl.java
index a892c476f..4cd8f65f3 100644
--- a/src/java/com/threerings/miso/client/DisplayMisoSceneImpl.java
+++ b/src/java/com/threerings/miso/client/DisplayMisoSceneImpl.java
@@ -1,5 +1,5 @@
 //
-// $Id: DisplayMisoSceneImpl.java,v 1.37 2001/09/28 01:46:10 mdb Exp $
+// $Id: DisplayMisoSceneImpl.java,v 1.38 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.scene;
 
@@ -10,12 +10,12 @@ import java.util.List;
 
 import com.samskivert.util.StringUtil;
 
-import com.threerings.media.tile.Tile;
 import com.threerings.media.tile.TileManager;
 import com.threerings.whirled.data.Scene;
 
 import com.threerings.miso.Log;
 import com.threerings.miso.scene.util.ClusterUtil;
+import com.threerings.miso.tile.MisoTile;
 
 /**
  * A scene object represents the data model corresponding to a single
@@ -47,8 +47,8 @@ public class MisoSceneImpl implements EditableMisoScene
 	_clusters = new ArrayList();
         _portals = new ArrayList();
 
-	_tiles = new Tile[_model.scenewid][_model.scenehei][NUM_LAYERS];
-	_deftile = _tilemgr.getTile(deftsid, deftid);
+	_tiles = new MisoTile[_model.scenewid][_model.scenehei][NUM_LAYERS];
+	_deftile = (MisoTile)_tilemgr.getTile(deftsid, deftid);
 	for (int xx = 0; xx < _model.scenewid; xx++) {
 	    for (int yy = 0; yy < _model.scenehei; yy++) {
 		for (int ii = 0; ii < NUM_LAYERS; ii++) {
@@ -73,7 +73,7 @@ public class MisoSceneImpl implements EditableMisoScene
     public MisoSceneImpl (IsoSceneViewModel model, TileManager tilemgr,
                           String name, ArrayList locations,
                           ArrayList clusters, ArrayList portals,
-                          Tile[][][] tiles)
+                          MisoTile[][][] tiles)
     {
 	_model = model;
 	_tilemgr = tilemgr;
@@ -110,13 +110,13 @@ public class MisoSceneImpl implements EditableMisoScene
     }
 
     // documentation inherited
-    public Tile[][][] getTiles ()
+    public MisoTile[][][] getTiles ()
     {
         return _tiles;
     }
 
     // documentation inherited
-    public Tile getDefaultTile ()
+    public MisoTile getDefaultTile ()
     {
 	return _deftile;
     }
@@ -261,7 +261,7 @@ public class MisoSceneImpl implements EditableMisoScene
     protected int _version;
 
     /** The tiles comprising the scene. */
-    public Tile[][][] _tiles;
+    public MisoTile[][][] _tiles;
 
     /** The default entrance portal. */
     protected Portal _entrance;
@@ -276,7 +276,7 @@ public class MisoSceneImpl implements EditableMisoScene
     protected ArrayList _portals;
 
     /** The default tile for the base layer in the scene. */
-    protected Tile _deftile;
+    protected MisoTile _deftile;
 
     /** The iso scene view data model. */
     protected IsoSceneViewModel _model;
diff --git a/src/java/com/threerings/miso/client/MisoScene.java b/src/java/com/threerings/miso/client/MisoScene.java
index cb735efd9..f1d28410a 100644
--- a/src/java/com/threerings/miso/client/MisoScene.java
+++ b/src/java/com/threerings/miso/client/MisoScene.java
@@ -1,11 +1,11 @@
 //
-// $Id: MisoScene.java,v 1.3 2001/10/05 23:58:36 mdb Exp $
+// $Id: MisoScene.java,v 1.4 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.scene;
 
 import java.util.List;
 
-import com.threerings.media.tile.Tile;
+import com.threerings.miso.tile.MisoTile;
 
 /**
  * A scene object represents the data model corresponding to a single
@@ -42,12 +42,12 @@ public interface MisoScene
     /**
      * Return the tiles that comprise this scene.
      */
-    public Tile[][][] getTiles ();
+    public MisoTile[][][] getTiles ();
 
     /**
      * Return the default tile for the base layer of the scene.
      */
-    public Tile getDefaultTile ();
+    public MisoTile getDefaultTile ();
 
     /**
      * Return the locations in this scene. The locations list should
diff --git a/src/java/com/threerings/miso/client/Traverser.java b/src/java/com/threerings/miso/client/Traverser.java
index 52bc776bf..23c0e089b 100644
--- a/src/java/com/threerings/miso/client/Traverser.java
+++ b/src/java/com/threerings/miso/client/Traverser.java
@@ -1,9 +1,9 @@
 //
-// $Id: Traverser.java,v 1.2 2001/08/16 23:14:21 mdb Exp $
+// $Id: Traverser.java,v 1.3 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.scene;
 
-import com.threerings.media.tile.Tile;
+import com.threerings.miso.tile.MisoTile;
 
 /**
  * The <code>Traverser</code> interface should be implemented by
@@ -21,5 +21,5 @@ public interface Traverser
      *
      * @return whether the tile is traversable.
      */
-    public boolean canTraverse (Tile tile);
+    public boolean canTraverse (MisoTile tile);
 }
diff --git a/src/java/com/threerings/miso/client/util/AStarPathUtil.java b/src/java/com/threerings/miso/client/util/AStarPathUtil.java
index 0342c884b..779d46ca3 100644
--- a/src/java/com/threerings/miso/client/util/AStarPathUtil.java
+++ b/src/java/com/threerings/miso/client/util/AStarPathUtil.java
@@ -1,16 +1,16 @@
 //
-// $Id: AStarPathUtil.java,v 1.4 2001/08/23 00:55:30 shaper Exp $
+// $Id: AStarPathUtil.java,v 1.5 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.scene.util;
 
 import java.awt.Point;
 import java.util.*;
 
-import com.threerings.media.tile.Tile;
 import com.threerings.media.util.MathUtil;
 
 import com.threerings.miso.Log;
 import com.threerings.miso.scene.Traverser;
+import com.threerings.miso.tile.MisoTile;
 
 /**
  * The <code>AStarPathUtil</code> class provides a facility for
@@ -43,7 +43,7 @@ public class AStarPathUtil
      * @return the list of points in the path.
      */
     public static List getPath (
-	Tile tiles[][][], int tilewid, int tilehei, Traverser trav,
+	MisoTile tiles[][][], int tilewid, int tilehei, Traverser trav,
 	int ax, int ay, int bx, int by)
     {
 	AStarInfo info = new AStarInfo(tiles, tilewid, tilehei, trav, bx, by);
@@ -198,7 +198,7 @@ public class AStarPathUtil
 class AStarInfo
 {
     /** The array of tiles being traversed. */
-    public Tile tiles[][][];
+    public MisoTile tiles[][][];
 
     /** The tile array dimensions. */
     public int tilewid, tilehei;
@@ -219,7 +219,7 @@ class AStarInfo
     public int destx, desty;
 
     public AStarInfo (
-	Tile tiles[][][], int tilewid, int tilehei, Traverser trav,
+	MisoTile tiles[][][], int tilewid, int tilehei, Traverser trav,
 	int destx, int desty)
     {
 	// save off references
diff --git a/src/java/com/threerings/miso/tile/BaseTile.java b/src/java/com/threerings/miso/tile/BaseTile.java
new file mode 100644
index 000000000..f9530ce73
--- /dev/null
+++ b/src/java/com/threerings/miso/tile/BaseTile.java
@@ -0,0 +1,23 @@
+//
+// $Id: BaseTile.java,v 1.1 2001/10/08 21:04:25 shaper Exp $
+
+package com.threerings.miso.tile;
+
+import com.threerings.media.tile.Tile;
+
+/**
+ * The miso tile class extends the base tile class to add support for
+ * tile passability.
+ *
+ * @see MisoTileSet
+ */
+public class MisoTile extends Tile
+{
+    /** Whether the tile is passable. */
+    public boolean passable;
+
+    public MisoTile (int tsid, int tid)
+    {
+	super(tsid, tid);
+    }
+}
diff --git a/src/java/com/threerings/miso/tile/BaseTileSet.java b/src/java/com/threerings/miso/tile/BaseTileSet.java
new file mode 100644
index 000000000..c0f2053e6
--- /dev/null
+++ b/src/java/com/threerings/miso/tile/BaseTileSet.java
@@ -0,0 +1,39 @@
+//
+// $Id: BaseTileSet.java,v 1.1 2001/10/08 21:04:25 shaper Exp $
+
+package com.threerings.miso.tile;
+
+import com.threerings.media.tile.*;
+
+/**
+ * The miso tile set class extends the base tile set class to add
+ * support for tile passability.  Passability is used to determine
+ * whether {@link com.threerings.miso.scene.Traverser} objects can
+ * traverse a particular tile in a {@link
+ * com.threerings.miso.scene.MisoScene}.
+ */
+public class MisoTileSet extends TileSet
+{
+    public MisoTileSet ()
+    {
+	_model = new MisoTileSetModel();
+    }
+
+    public Tile createTile (int tid)
+    {
+	MisoTile tile = new MisoTile(_model.tsid, tid);
+
+	// set the tile's passability, defaulting to passable if this
+	// tileset has no passability specified
+	int passable[] = ((MisoTileSetModel)_model).passable;
+	tile.passable = (passable == null || (passable[tid] == 1));
+
+	return tile;
+    }
+
+    protected static class MisoTileSetModel extends TileSetModel
+    {
+	/** Whether each tile is passable. */
+	public int passable[];
+    }
+}
diff --git a/src/java/com/threerings/miso/tile/EditableTileSetManager.java b/src/java/com/threerings/miso/tile/EditableTileSetManager.java
index 907bbbbc9..ae976739c 100644
--- a/src/java/com/threerings/miso/tile/EditableTileSetManager.java
+++ b/src/java/com/threerings/miso/tile/EditableTileSetManager.java
@@ -1,5 +1,5 @@
 //
-// $Id: EditableTileSetManager.java,v 1.10 2001/08/29 18:41:46 shaper Exp $
+// $Id: EditableTileSetManager.java,v 1.11 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.tile;
 
@@ -30,7 +30,7 @@ public class EditableTileSetManager extends TileSetManagerImpl
         String fname = config.getValue(TILESETS_KEY, (String)null);
         ArrayList tilesets = null;
         try {
-            tilesets = new XMLTileSetParser().loadTileSets(fname);
+            tilesets = new XMLMisoTileSetParser().loadTileSets(fname);
         } catch (IOException ioe) {
 	    Log.warning("Exception loading tileset [fname=" + fname +
 			", ioe=" + ioe + "].");
diff --git a/src/java/com/threerings/miso/tile/tools/xml/XMLMisoTileSetParser.java b/src/java/com/threerings/miso/tile/tools/xml/XMLMisoTileSetParser.java
new file mode 100644
index 000000000..fb81e155c
--- /dev/null
+++ b/src/java/com/threerings/miso/tile/tools/xml/XMLMisoTileSetParser.java
@@ -0,0 +1,31 @@
+//
+// $Id: XMLMisoTileSetParser.java,v 1.1 2001/10/08 21:04:25 shaper Exp $
+
+package com.threerings.miso.tile;
+
+import com.samskivert.util.StringUtil;
+
+import com.threerings.media.tile.*;
+
+/**
+ * Extends the base XML tile set parser to construct {@link
+ * MisoTileSet} tilesets that provide additional functionality
+ * specific to the miso layer.
+ */
+public class XMLMisoTileSetParser extends XMLTileSetParser
+{
+    protected void finishElement (String qName, String str)
+    {
+	super.finishElement(qName, str);
+
+	if (qName.equals("passable")) {
+	    ((MisoTileSet.MisoTileSetModel)_model).passable =
+		StringUtil.parseIntArray(str);
+	}
+    }
+
+    protected TileSet createTileSet ()
+    {
+	return new MisoTileSet();
+    }
+}
diff --git a/src/java/com/threerings/miso/tools/xml/XMLSceneParser.java b/src/java/com/threerings/miso/tools/xml/XMLSceneParser.java
index 56f055881..f2642a774 100644
--- a/src/java/com/threerings/miso/tools/xml/XMLSceneParser.java
+++ b/src/java/com/threerings/miso/tools/xml/XMLSceneParser.java
@@ -1,5 +1,5 @@
 //
-// $Id: XMLSceneParser.java,v 1.16 2001/09/21 02:30:35 mdb Exp $
+// $Id: XMLSceneParser.java,v 1.17 2001/10/08 21:04:25 shaper Exp $
 
 package com.threerings.miso.scene.xml;
 
@@ -17,6 +17,7 @@ import com.threerings.media.tile.*;
 
 import com.threerings.miso.Log;
 import com.threerings.miso.scene.*;
+import com.threerings.miso.tile.MisoTile;
 
 /**
  * Parse an XML scene description file and construct a scene object.
@@ -103,7 +104,9 @@ public class XMLSceneParser extends DefaultHandler
     public void characters (char ch[], int start, int length)
     {
 	// bail if we're not within a meaningful tag
-	if (_tag == null) return;
+	if (_tag == null) {
+	    return;
+	}
 
   	_chars.append(ch, start, length);
     }
@@ -131,7 +134,7 @@ public class XMLSceneParser extends DefaultHandler
 
         // create the tile objects in the tile array
         for (int xx = 0; xx < vals.length; xx += 2) {
-            Tile tile = _tilemgr.getTile(vals[xx], vals[xx + 1]);
+            MisoTile tile = (MisoTile)_tilemgr.getTile(vals[xx], vals[xx + 1]);
             info.tiles[xx / 2][info.rownum][info.lnum] = tile;
         }
     }
@@ -162,7 +165,7 @@ public class XMLSceneParser extends DefaultHandler
 
         // create the tile objects in the tile array
         for (int xx = 0; xx < vals.length; xx += 2) {
-            Tile tile = _tilemgr.getTile(vals[xx], vals[xx + 1]);
+            MisoTile tile = (MisoTile)_tilemgr.getTile(vals[xx], vals[xx + 1]);
 	    int xidx = info.colstart + (xx / 2);
             info.tiles[xidx][info.rownum][info.lnum] = tile;
         }
@@ -234,7 +237,9 @@ public class XMLSceneParser extends DefaultHandler
     protected ArrayList toPortalList (ArrayList locs, String[] vals)
     {
         // make sure we have an appropriate number of values
-        if ((vals.length % 2) != 0) return null;
+        if ((vals.length % 2) != 0) {
+	    return null;
+	}
 
 	// read in all of the portals
 	ArrayList portals = new ArrayList();
@@ -342,7 +347,7 @@ public class XMLSceneParser extends DefaultHandler
 	public ArrayList clusters;
 
 	/** The tile array. */
-	public Tile[][][] tiles;
+	public MisoTile[][][] tiles;
 
 	/** The current layer number being processed. */
 	public int lnum;
@@ -359,7 +364,7 @@ public class XMLSceneParser extends DefaultHandler
 	public SceneInfo ()
 	{
 	    int width = _model.scenewid, height = _model.scenehei;
-	    tiles = new Tile[width][height][MisoScene.NUM_LAYERS];
+	    tiles = new MisoTile[width][height][MisoScene.NUM_LAYERS];
 	    clusters = new ArrayList();
 	}
 
diff --git a/tests/src/java/com/threerings/miso/viewer/ViewerSceneViewPanel.java b/tests/src/java/com/threerings/miso/viewer/ViewerSceneViewPanel.java
index 39080a2bc..d5fd2ea40 100644
--- a/tests/src/java/com/threerings/miso/viewer/ViewerSceneViewPanel.java
+++ b/tests/src/java/com/threerings/miso/viewer/ViewerSceneViewPanel.java
@@ -1,5 +1,5 @@
 //
-// $Id: ViewerSceneViewPanel.java,v 1.16 2001/10/01 22:18:24 mdb Exp $
+// $Id: ViewerSceneViewPanel.java,v 1.17 2001/10/08 21:04:26 shaper Exp $
 
 package com.threerings.miso.viewer;
 
@@ -80,6 +80,12 @@ public class ViewerSceneViewPanel extends SceneViewPanel
 
         // get the path from here to there
         Path path = _view.getPath(_sprite, x, y);
+	if (path == null) {
+	    _sprite.cancelMove();
+	    return;
+	}
+
+	((LineSegmentPath)path).setVelocity(100f/1000f);
 	_sprite.move(path);
     }