diff --git a/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/__init__.py b/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/__init__.py
index eed24142..6977be7e 100644
--- a/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/__init__.py
+++ b/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/__init__.py
@@ -37,6 +37,9 @@ class ExportTHREEJSSlim(bpy.types.Operator, ExportHelper):
     use_modifiers = BoolProperty(name="Apply Modifiers", description="Apply modifiers to the exported mesh", default=True)
     use_normals = BoolProperty(name="Normals", description="Export normals", default=True)
     use_uv_coords = BoolProperty(name="UVs", description="Export texture coordinates", default=True)
+    
+    align_types = [("None","None","None"), ("Center","Center","Center"), ("Bottom","Bottom","Bottom"), ("Top","Top","Top")]
+    align_model = EnumProperty(name="Align model", description="Align model", items=align_types, default="Center")
 
     @classmethod
     def poll(cls, context):
@@ -57,9 +60,12 @@ class ExportTHREEJSSlim(bpy.types.Operator, ExportHelper):
 
         row = layout.row()
         row.prop(self.properties, "use_modifiers")
+        row = layout.row()
         row.prop(self.properties, "use_normals")
         row = layout.row()
         row.prop(self.properties, "use_uv_coords")
+        row = layout.row()
+        row.prop(self.properties, "align_model")
         
 
 def menu_func(self, context):
diff --git a/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/export_threejs_slim.py b/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/export_threejs_slim.py
index b097cb13..6d26ce0e 100644
--- a/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/export_threejs_slim.py
+++ b/utils/exporters/blender/2.54/scripts/op/io_mesh_threejs_slim/export_threejs_slim.py
@@ -41,9 +41,6 @@ import random
 # #####################################################
 # Configuration
 # #####################################################
-ALIGN = "center"    # center bottom top none
-SHADING = "smooth"  # smooth flat 
-TYPE = "ascii"      # ascii binary
 
 # default colors for debugging (each material gets one distinct color): 
 # white, red, green, blue, yellow, cyan, magenta
@@ -131,6 +128,84 @@ def get_uv_indices(f, uvs, mesh):
         uv.append( uvs[veckey2d(i)] )
     return uv
 
+# #####################################################
+# Alignment
+# #####################################################
+def bbox(vertices):
+    """Compute bounding box of vertex array.
+    """
+    
+    if len(vertices)>0:
+        minx = maxx = vertices[0].co.x
+        miny = maxy = vertices[0].co.y
+        minz = maxz = vertices[0].co.z
+        
+        for v in vertices[1:]:
+            if v.co.x < minx:
+                minx = v.co.x
+            elif v.co.x > maxx:
+                maxx = v.co.x
+            
+            if v.co.y < miny:
+                miny = v.co.y
+            elif v.co.y > maxy:
+                maxy = v.co.y
+
+            if v.co.z < minz:
+                minz = v.co.z
+            elif v.co.z > maxz:
+                maxz = v.co.z
+
+        return { 'x':[minx,maxx], 'y':[miny,maxy], 'z':[minz,maxz] }
+    
+    else:
+        return { 'x':[0,0], 'y':[0,0], 'z':[0,0] }
+
+def translate(vertices, t):
+    """Translate array of vertices by vector t.
+    """
+    
+    for i in range(len(vertices)):
+        vertices[i].co.x += t[0]
+        vertices[i].co.y += t[1]
+        vertices[i].co.z += t[2]
+
+def center(vertices):
+    """Center model (middle of bounding box).
+    """
+    
+    bb = bbox(vertices)
+    
+    cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
+    cy = bb['y'][0] + (bb['y'][1] - bb['y'][0])/2.0
+    cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
+    
+    translate(vertices, [-cx,-cy,-cz])
+
+def top(vertices):
+    """Align top of the model with the floor (Y-axis) and center it around X and Z.
+    """
+    
+    bb = bbox(vertices)
+    
+    cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
+    cy = bb['y'][1]
+    cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
+    
+    translate(vertices, [-cx,-cy,-cz])
+    
+def bottom(vertices):
+    """Align bottom of the model with the floor (Y-axis) and center it around X and Z.
+    """
+    
+    bb = bbox(vertices)
+    
+    cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
+    cy = bb['y'][0] 
+    cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
+    
+    translate(vertices, [-cx,-cy,-cz])
+
 # #####################################################
 # Elements
 # #####################################################
@@ -398,7 +473,7 @@ def extract_materials(mesh, scene):
         # http://www.blender.org/documentation/blender_python_api_2_54_0/bpy.types.Material.html#bpy.types.Material.specular_hardness
         materials[m.name]["specular_coef"] = m.specular_hardness 
         
-        if m.active_texture:
+        if m.active_texture and m.active_texture.type == 'IMAGE':
             fn = bpy.path.abspath(m.active_texture.image.filepath)
             fn = os.path.normpath(fn)
             fn_strip = os.path.basename(fn)
@@ -428,14 +503,24 @@ def generate_materials_string(mesh, scene):
 # #####################################################
 # ASCII exporter
 # #####################################################
-def generate_ascii_model(mesh, scene, use_normals, use_uv_coords):
+def generate_ascii_model(mesh, scene, use_normals, use_uv_coords, align_model):
+    
+    vertices = mesh.vertices[:]
+    
+    if align_model == 1:
+        center(vertices)
+    elif align_model == 2:
+        bottom(vertices)
+    elif align_model == 3:
+        top(vertices)
+    
     sfaces = sort_faces(mesh.faces, use_normals, use_uv_coords)
     
     normals = extract_vertex_normals(mesh, use_normals)
     uvs = extract_uvs(mesh, use_uv_coords)
     
     text = TEMPLATE_FILE_ASCII % {
-    "vertices"      : ",".join(generate_vertex(v) for v in mesh.vertices),
+    "vertices"      : ",".join(generate_vertex(v) for v in vertices),
     
     "triangles"     : ",".join(generate_triangle(f) for f in sfaces['triangles_flat']),
     "triangles_n"   : ",".join(generate_triangle_n(f, normals, mesh) for f in sfaces['triangles_smooth']),
@@ -462,7 +547,7 @@ def generate_ascii_model(mesh, scene, use_normals, use_uv_coords):
 # #####################################################
 # Main
 # #####################################################
-def save(operator, context, filepath="", use_modifiers=True, use_normals=True, use_uv_coords=True):
+def save(operator, context, filepath="", use_modifiers=True, use_normals=True, use_uv_coords=True, align_model=1):
 
     def rvec3d(v):
         return round(v[0], 6), round(v[1], 6), round(v[2], 6)
@@ -508,7 +593,7 @@ def save(operator, context, filepath="", use_modifiers=True, use_normals=True, u
         if not active_uv_layer:
             use_uv_coords = False
 
-    text = generate_ascii_model(mesh, scene, use_normals, use_uv_coords)
+    text = generate_ascii_model(mesh, scene, use_normals, use_uv_coords, align_model)
     file = open(filepath, 'w')
     file.write(text)
     file.close()
diff --git a/utils/exporters/convert_obj_threejs.py b/utils/exporters/convert_obj_threejs.py
index fd1ed578..41b5fa2d 100644
--- a/utils/exporters/convert_obj_threejs.py
+++ b/utils/exporters/convert_obj_threejs.py
@@ -393,7 +393,7 @@ def bottom(vertices):
     cy = bb['y'][0] 
     cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
     
-    translate(vertices, [-cx,cy,-cz])
+    translate(vertices, [-cx,-cy,-cz])
 
 def normalize(v):
     """Normalize 3d vector"""
diff --git a/utils/exporters/convert_obj_threejs_slim.py b/utils/exporters/convert_obj_threejs_slim.py
index fe18da7a..9152f6b8 100644
--- a/utils/exporters/convert_obj_threejs_slim.py
+++ b/utils/exporters/convert_obj_threejs_slim.py
@@ -314,7 +314,7 @@ def bottom(vertices):
     cy = bb['y'][0] 
     cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
     
-    translate(vertices, [-cx,cy,-cz])
+    translate(vertices, [-cx,-cy,-cz])
 
 def normalize(v):
     """Normalize 3d vector"""