diff --git a/utils/exporters/blender/addons/io_three/constants.py b/utils/exporters/blender/addons/io_three/constants.py
index 2a8d676abe9c06bc9ae885f33db912065944d46d..77177250f70f3a60249963640da67f94cf59cd1b 100644
--- a/utils/exporters/blender/addons/io_three/constants.py
+++ b/utils/exporters/blender/addons/io_three/constants.py
@@ -338,6 +338,7 @@ INTENSITY = 'intensity'
 DISTANCE = 'distance'
 ASPECT = 'aspect'
 ANGLE = 'angle'
+DECAY = 'decayExponent'
 
 FOV = 'fov'
 ASPECT = 'aspect'
diff --git a/utils/exporters/blender/addons/io_three/exporter/api/animation.py b/utils/exporters/blender/addons/io_three/exporter/api/animation.py
index 1445daf2979b4b92b4c33a28f1bb2fb0cd78ec9e..d18e396a6385a41b221bb26978bac8aebb947b3c 100644
--- a/utils/exporters/blender/addons/io_three/exporter/api/animation.py
+++ b/utils/exporters/blender/addons/io_three/exporter/api/animation.py
@@ -7,7 +7,6 @@ import mathutils
 from bpy import data, context, ops
 from .. import constants, logger
 
-
 def pose_animation(armature, options):
     """Query armature animation using pose bones
 
@@ -47,9 +46,10 @@ def _parse_action(func, armature, options):
     animations = []
     logger.info("Parsing %d actions", len(data.actions))
     for action in data.actions:
-        logger.info("Parsing action %s", action.name)
-        animation = func(action, armature, options)
-        animations.append(animation)
+        if action == armature.animation_data.action:
+            logger.info("Parsing action %s", action.name)
+            animation = func(action, armature, options)
+            animations.append(animation)
     return animations
 
 
diff --git a/utils/exporters/blender/addons/io_three/exporter/api/light.py b/utils/exporters/blender/addons/io_three/exporter/api/light.py
index 33c5fa86dd89b3c33b364471bb2675a996f6ab03..25a8cc48da1aecd12425c40034030ba715ddd4b1 100644
--- a/utils/exporters/blender/addons/io_three/exporter/api/light.py
+++ b/utils/exporters/blender/addons/io_three/exporter/api/light.py
@@ -75,3 +75,23 @@ def intensity(lamp):
     """
     logger.debug("light.intensity(%s)", lamp)
     return round(lamp.energy, 2)
+
+# mapping enum values to decay exponent
+__FALLOFF_TO_EXP = {
+    'CONSTANT': 0,
+    'INVERSE_LINEAR': 1,
+    'INVERSE_SQUARE': 2,
+    'CUSTOM_CURVE': 0,
+    'LINEAR_QUADRATIC_WEIGHTED': 2
+}
+
+@_lamp
+def falloff(lamp):
+    """
+
+    :param lamp:
+    :rtype: float
+
+    """
+    logger.debug("light.falloff(%s)", lamp)
+    return __FALLOFF_TO_EXP[lamp.falloff_type]
diff --git a/utils/exporters/blender/addons/io_three/exporter/api/mesh.py b/utils/exporters/blender/addons/io_three/exporter/api/mesh.py
index fa942b2b7cd4c9e19f3b47f727314db085ebd3a6..d7cc5d6c7fbc8ee6e5d4ac54444666e401f161f4 100644
--- a/utils/exporters/blender/addons/io_three/exporter/api/mesh.py
+++ b/utils/exporters/blender/addons/io_three/exporter/api/mesh.py
@@ -342,9 +342,9 @@ def faces(mesh, options, material_list=None):
                     face_data.append(mat_index)
                     break
             else:
-                error = ("Could not map the material index "
+                logger.warning("Could not map the material index "
                          "for face %d" % face.index)
-                raise exceptions.MaterialError(error)
+                face_data.append(0)  # default to index zero if there's a bad material
 
         if uv_indices:
             for index, uv_layer in enumerate(uv_indices):
@@ -465,6 +465,11 @@ def animated_blend_shapes(mesh, name, options):
     :param options:
 
     """
+
+    # let filter the name to only keep the node's name
+    # the two cases are '%sGeometry' and '%sGeometry.%d', and we want %s
+    name = re.search("^(.*)Geometry(\..*)?$", name).group(1)
+
     logger.debug("mesh.animated_blend_shapes(%s, %s)", mesh, options)
     tracks = []
     shp = mesh.shape_keys
@@ -520,6 +525,9 @@ def materials(mesh, options):
     logger.info("Vertex colours set to %s", use_colors)
 
     for mat, index in material_sets:
+        if mat == None:     # undefined material for a specific index is skipped
+            continue
+
         try:
             dbg_color = constants.DBG_COLORS[index]
         except IndexError:
diff --git a/utils/exporters/blender/addons/io_three/exporter/geometry.py b/utils/exporters/blender/addons/io_three/exporter/geometry.py
index 0e2cc502d2a19516d07878843d3f2213d96c01bd..389bdf266c596e698d91463e3f4a932aefdebb1f 100644
--- a/utils/exporters/blender/addons/io_three/exporter/geometry.py
+++ b/utils/exporters/blender/addons/io_three/exporter/geometry.py
@@ -568,7 +568,6 @@ class Geometry(base_classes.BaseNode):
             mt = api.mesh.blend_shapes(self.node, self.options) or []
             self[constants.MORPH_TARGETS] = mt
             if len(mt) > 0 and self._scene:  # there's blend shapes, let check for animation
-                #self[constants.CLIPS] = api.mesh.animated_blend_shapes(self.node, self.options) or []
                 tracks = api.mesh.animated_blend_shapes(self.node, self[constants.NAME], self.options) or []
                 merge = self._scene[constants.ANIMATION][0][constants.KEYFRAMES]
                 for track in tracks:
diff --git a/utils/exporters/blender/addons/io_three/exporter/object.py b/utils/exporters/blender/addons/io_three/exporter/object.py
index d6309017f5ac8cc3a78c76c61d8714d9ecb969d3..0a5ddfc53644d2ee3ba177bc569931a5397f5875 100644
--- a/utils/exporters/blender/addons/io_three/exporter/object.py
+++ b/utils/exporters/blender/addons/io_three/exporter/object.py
@@ -51,8 +51,12 @@ class Object(base_classes.BaseNode):
         #    self[constants.DISTANCE] = api.light.distance(self.data)
         self[constants.DISTANCE] = 0;
 
-        if self[constants.TYPE] == constants.SPOT_LIGHT:
+        lightType = self[constants.TYPE]
+        if lightType == constants.SPOT_LIGHT:
             self[constants.ANGLE] = api.light.angle(self.data)
+            self[constants.DECAY] = api.light.falloff(self.data)
+        elif lightType == constants.POINT_LIGHT:
+            self[constants.DECAY] = api.light.falloff(self.data)
 
     def _init_mesh(self):
         """Initialize mesh attributes"""