diff --git a/src/play_clj/core.clj b/src/play_clj/core.clj
index a66b54b..1cbe465 100644
--- a/src/play_clj/core.clj
+++ b/src/play_clj/core.clj
@@ -4,7 +4,7 @@
             InputMultiplexer InputProcessor Net Screen]
            [com.badlogic.gdx.audio Sound]
            [com.badlogic.gdx.graphics Camera Color GL20 OrthographicCamera
-            PerspectiveCamera]
+            PerspectiveCamera VertexAttributes$Usage]
            [com.badlogic.gdx.graphics.g2d NinePatch ParticleEffect SpriteBatch
             TextureRegion]
            [com.badlogic.gdx.graphics.g3d Environment ModelBatch ModelInstance]
diff --git a/src/play_clj/core_global.clj b/src/play_clj/core_global.clj
index 1c10f88..95dfbb4 100644
--- a/src/play_clj/core_global.clj
+++ b/src/play_clj/core_global.clj
@@ -12,7 +12,7 @@
   ([r g b a]
     (doto (Gdx/gl)
       (.glClearColor (float r) (float g) (float b) (float a))
-      (.glClear GL20/GL_COLOR_BUFFER_BIT))))
+      (.glClear (bit-or GL20/GL_COLOR_BUFFER_BIT GL20/GL_DEPTH_BUFFER_BIT)))))
 
 (defmacro color
   "Returns a [Color](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/Color.html)
diff --git a/src/play_clj/core_graphics.clj b/src/play_clj/core_graphics.clj
index 78f34ea..a645c82 100644
--- a/src/play_clj/core_graphics.clj
+++ b/src/play_clj/core_graphics.clj
@@ -230,9 +230,9 @@ with the tiled map file at `path` and `unit` scale
   (.draw object batch 1))
 
 (defmethod draw-entity! :model
-  [{:keys [^ModelBatch batch ^Environment attributes]}
+  [{:keys [^ModelBatch renderer ^Environment attributes]}
    {:keys [^ModelInstance object]}]
-  (.render batch object attributes))
+  (.render renderer object attributes))
 
 ; draw
 
@@ -320,15 +320,17 @@ with the tiled map file at `path` and `unit` scale
 
 (defn perspective*
   "The function version of `perspective`"
-  []
-  (PerspectiveCamera.))
+  ([]
+    (PerspectiveCamera.))
+  ([field-of-view viewport-width viewport-height]
+    (PerspectiveCamera. field-of-view viewport-width viewport-height)))
 
 (defmacro perspective
   "Returns an [PerspectiveCamera](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/PerspectiveCamera.html)
 
     (perspective)"
-  [& options]
-  `(let [^PerspectiveCamera object# (perspective*)]
+  [fov vw vh & options]
+  `(let [^PerspectiveCamera object# (perspective* ~fov ~vw ~vh)]
      (u/calls! object# ~@options)))
 
 (defmacro perspective!
@@ -343,7 +345,6 @@ with the tiled map file at `path` and `unit` scale
     (size! screen 480 360)"
   [screen width height]
   (let [^OrthographicCamera camera (u/get-obj screen :camera)]
-    (assert camera)
     (.setToOrtho camera false width height)))
 
 (defn width!
@@ -366,7 +367,6 @@ remains in tact
   "Sets only the x position of the camera in `screen`"
   [screen x]
   (let [^Camera camera (u/get-obj screen :camera)]
-    (assert camera)
     (set! (. (. camera position) x) x)
     (.update camera)))
 
@@ -374,7 +374,6 @@ remains in tact
   "Sets only the y position of the camera in `screen`"
   [screen y]
   (let [^Camera camera (u/get-obj screen :camera)]
-    (assert camera)
     (set! (. (. camera position) y) y)
     (.update camera)))
 
@@ -382,7 +381,6 @@ remains in tact
   "Sets only the z position of the camera in `screen`"
   [screen z]
   (let [^Camera camera (u/get-obj screen :camera)]
-    (assert camera)
     (set! (. (. camera position) z) z)
     (.update camera)))
 
@@ -394,3 +392,31 @@ remains in tact
     (when x (x! screen x))
     (when y (y! screen y))
     (when z (z! screen z))))
+
+(defn direction!
+  "Sets the directino of the camera in `screen`"
+  [screen x y z]
+  (let [^Camera camera (u/get-obj screen :camera)]
+    (.lookAt camera x y z)
+    (.update camera)))
+
+(defn near!
+  "Sets the near clipping plane distance of the camera in `screen`"
+  [screen n]
+  (let [^Camera camera (u/get-obj screen :camera)]
+    (set! (. camera near) n)
+    (.update camera)))
+
+(defn far!
+  "Sets the far clipping plane distance of the camera in `screen`"
+  [screen n]
+  (let [^Camera camera (u/get-obj screen :camera)]
+    (set! (. camera far) n)
+    (.update camera)))
+
+; misc
+
+(defmacro usage
+  "Returns a static field in [VertexAttributes.Usage](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/VertexAttributes.Usage.html)"
+  [k]
+  `~(u/gdx-field :graphics "VertexAttributes$Usage" (u/key->pascal k)))
diff --git a/src/play_clj/g3d.clj b/src/play_clj/g3d.clj
index 644c9f4..0671a1b 100644
--- a/src/play_clj/g3d.clj
+++ b/src/play_clj/g3d.clj
@@ -54,7 +54,7 @@
 (defmacro model
   "Returns an entity based on [ModelInstance](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/g3d/ModelInstance.html)"
   [& args]
-  `(ModelInstance. ~@args))
+  `(u/create-entity (ModelInstance. ~@args)))
 
 (defmacro model!
   "Calls a single method on a `model`"
@@ -84,12 +84,18 @@
 
 ; material
 
+(defn material*
+  "The function version of `material`"
+  []
+  (Material.))
+
 (defmacro material
   "Returns a [Material](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/g3d/Material.html)
 
     (material)"
-  [& args]
-  `(Material. ~@args))
+  [& options]
+  `(let [^Material object# (material*)]
+     (u/calls! object# ~@options)))
 
 (defmacro material!
   "Calls a single method on a `material`"
@@ -120,7 +126,7 @@
                  (u/key->pascal k)))
 
 (defmacro attribute!
-  "Calls a single method on a subclass of [Attribute](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/g3d/Attribute.html)
+  "Calls a static method in a subclass of [Attribute](http://libgdx.badlogicgames.com/nightlies/docs/api/com/badlogic/gdx/graphics/g3d/Attribute.html)
 
     (attribute! :color :create-diffuse (color :blue))"
   [type k & options]