diff --git a/azalea-physics/src/discrete_voxel_shape.rs b/azalea-physics/src/discrete_voxel_shape.rs
index d3f9932d..1750612f 100644
--- a/azalea-physics/src/discrete_voxel_shape.rs
+++ b/azalea-physics/src/discrete_voxel_shape.rs
@@ -19,17 +19,17 @@ pub trait DiscreteVoxelShape {
     //     }
     //     return false;
     // }
-    fn x_size(&self) -> usize;
-    fn y_size(&self) -> usize;
-    fn z_size(&self) -> usize;
+    fn x_size(&self) -> u32;
+    fn y_size(&self) -> u32;
+    fn z_size(&self) -> u32;
 
-    fn first_full_x(&self) -> usize;
-    fn first_full_y(&self) -> usize;
-    fn first_full_z(&self) -> usize;
+    fn first_full_x(&self) -> u32;
+    fn first_full_y(&self) -> u32;
+    fn first_full_z(&self) -> u32;
 
-    fn last_full_x(&self) -> usize;
-    fn last_full_y(&self) -> usize;
-    fn last_full_z(&self) -> usize;
+    fn last_full_x(&self) -> u32;
+    fn last_full_y(&self) -> u32;
+    fn last_full_z(&self) -> u32;
 
     fn is_empty(&self) -> bool {
         if self.first_full_x() >= self.last_full_x() {
@@ -121,3 +121,35 @@ impl BitSetDiscreteVoxelShape {
         ((x * self.y_size + y) * self.z_size + z) as usize
     }
 }
+
+impl DiscreteVoxelShape for BitSetDiscreteVoxelShape {
+    fn x_size(&self) -> u32 {
+        self.x_size
+    }
+    fn y_size(&self) -> u32 {
+        self.y_size
+    }
+    fn z_size(&self) -> u32 {
+        self.z_size
+    }
+
+    fn first_full_x(&self) -> u32 {
+        self.x_min
+    }
+    fn first_full_y(&self) -> u32 {
+        self.y_min
+    }
+    fn first_full_z(&self) -> u32 {
+        self.z_min
+    }
+
+    fn last_full_x(&self) -> u32 {
+        self.x_max
+    }
+    fn last_full_y(&self) -> u32 {
+        self.y_max
+    }
+    fn last_full_z(&self) -> u32 {
+        self.z_max
+    }
+}
diff --git a/azalea-physics/src/lib.rs b/azalea-physics/src/lib.rs
index c05b2662..015fc916 100644
--- a/azalea-physics/src/lib.rs
+++ b/azalea-physics/src/lib.rs
@@ -81,7 +81,7 @@ impl HasPhysics for Entity {
         dimension: &Dimension,
         entity_collisions: Vec<Box<dyn VoxelShape>>,
     ) -> Vec3 {
-        let mut collision_boxes = Vec::with_capacity(1); // entity_collisions.len() + 1
+        let mut collision_boxes: Vec<Box<dyn VoxelShape>> = Vec::with_capacity(1); // entity_collisions.len() + 1
 
         if !entity_collisions.is_empty() {
             collision_boxes.extend(entity_collisions);
@@ -91,7 +91,7 @@ impl HasPhysics for Entity {
 
         let block_collisions =
             dimension.get_block_collisions(entity, entity_bounding_box.expand_towards(movement));
-        collision_boxes.extend(block_collisions);
+        collision_boxes.extend(block_collisions.map(Box::new).collect::<Vec<_>>());
         Self::collide_with_shapes(movement, &entity_bounding_box, &collision_boxes)
     }
 
diff --git a/azalea-physics/src/shape.rs b/azalea-physics/src/shape.rs
index 7ec057ec..e6ff3b40 100644
--- a/azalea-physics/src/shape.rs
+++ b/azalea-physics/src/shape.rs
@@ -1,15 +1,20 @@
-use std::ops::{Add, Index};
-
-use azalea_core::Direction;
-
 use crate::{BitSetDiscreteVoxelShape, DiscreteVoxelShape};
+use std::ops::Add;
 
 pub struct Shapes {}
 
 pub fn block_shape() -> Box<dyn VoxelShape> {
     let mut shape = BitSetDiscreteVoxelShape::new(1, 1, 1);
     shape.fill(0, 0, 0);
-    VoxelShape::new(Box::new(shape))
+    Box::new(CubeVoxelShape::new(Box::new(shape)))
+}
+pub fn empty_shape() -> Box<dyn VoxelShape> {
+    Box::new(ArrayVoxelShape::new(
+        Box::new(BitSetDiscreteVoxelShape::new(0, 0, 0)),
+        vec![0.],
+        vec![0.],
+        vec![0.],
+    ))
 }
 
 pub trait VoxelShape {
@@ -19,17 +24,16 @@ pub trait VoxelShape {
     fn get_y_coords(&self) -> Vec<f64>;
     fn get_z_coords(&self) -> Vec<f64>;
 
-    fn move_relative(&self, x: f64, y: f64, z: f64) -> ArrayVoxelShape {
+    fn move_relative(&self, x: f64, y: f64, z: f64) -> Box<dyn VoxelShape> {
         if self.shape().is_empty() {
-            return Shapes::empty();
+            return empty_shape();
         }
-        // TODO: just offset the vecs now instead of using an OffsetVec
-        ArrayVoxelShape::new(
+        Box::new(ArrayVoxelShape::new(
             self.shape(),
             self.get_x_coords().iter().map(|c| c + x).collect(),
             self.get_y_coords().iter().map(|c| c + y).collect(),
             self.get_z_coords().iter().map(|c| c + z).collect(),
-        )
+        ))
     }
 }
 
@@ -42,20 +46,12 @@ pub struct ArrayVoxelShape {
     pub zs: Vec<f64>,
 }
 
+pub struct CubeVoxelShape {
+    shape: Box<dyn DiscreteVoxelShape>,
+    faces: Option<Vec<Box<dyn VoxelShape>>>,
+}
+
 impl ArrayVoxelShape {
-    // ArrayVoxelShape(DiscreteVoxelShape var1, DoubleList var2, DoubleList var3, DoubleList var4) {
-    //     super(var1);
-    //     int var5 = var1.getXSize() + 1;
-    //     int var6 = var1.getYSize() + 1;
-    //     int var7 = var1.getZSize() + 1;
-    //     if (var5 == var2.size() && var6 == var3.size() && var7 == var4.size()) {
-    //        this.xs = var2;
-    //        this.ys = var3;
-    //        this.zs = var4;
-    //     } else {
-    //        throw (IllegalArgumentException)Util.pauseInIde(new IllegalArgumentException("Lengths of point arrays must be consistent with the size of the VoxelShape."));
-    //     }
-    // }
     pub fn new(
         shape: Box<dyn DiscreteVoxelShape>,
         xs: Vec<f64>,
@@ -67,9 +63,9 @@ impl ArrayVoxelShape {
         let z_size = shape.z_size() + 1;
 
         // Lengths of point arrays must be consistent with the size of the VoxelShape.
-        assert_eq!(x_size, xs.len());
-        assert_eq!(y_size, ys.len());
-        assert_eq!(z_size, zs.len());
+        assert_eq!(x_size, xs.len() as u32);
+        assert_eq!(y_size, ys.len() as u32);
+        assert_eq!(z_size, zs.len() as u32);
 
         Self {
             faces: None,
@@ -81,25 +77,59 @@ impl ArrayVoxelShape {
     }
 }
 
-// mojang moment
-// this is probably for an optimization and could probably be optimized more
-/// A Vec that adds the given offset when indexing into it.
-pub struct OffsetVec<T> {
-    delegate: Vec<T>,
-    offset: T,
+impl CubeVoxelShape {
+    pub fn new(shape: Box<dyn DiscreteVoxelShape>) -> Self {
+        Self { shape, faces: None }
+    }
 }
 
-impl<T> OffsetVec<T>
-where
-    T: Add<Output = T>,
-{
-    pub fn new(delegate: Vec<T>, offset: T) -> Self {
-        Self { delegate, offset }
+impl VoxelShape for ArrayVoxelShape {
+    fn shape(&self) -> Box<dyn DiscreteVoxelShape> {
+        todo!()
     }
-    pub fn index(&self, index: usize) -> T {
-        self.delegate[index] + self.offset
+
+    fn get_x_coords(&self) -> Vec<f64> {
+        todo!()
     }
-    pub fn len(&self) -> usize {
-        self.delegate.len()
+
+    fn get_y_coords(&self) -> Vec<f64> {
+        todo!()
+    }
+
+    fn get_z_coords(&self) -> Vec<f64> {
+        todo!()
+    }
+}
+
+impl VoxelShape for CubeVoxelShape {
+    fn shape(&self) -> Box<dyn DiscreteVoxelShape> {
+        todo!()
+    }
+
+    fn get_x_coords(&self) -> Vec<f64> {
+        let size = self.shape.x_size();
+        let mut parts = Vec::with_capacity(size as usize);
+        for i in 0..size {
+            parts.push(i as f64 / size as f64);
+        }
+        parts
+    }
+
+    fn get_y_coords(&self) -> Vec<f64> {
+        let size = self.shape.y_size();
+        let mut parts = Vec::with_capacity(size as usize);
+        for i in 0..size {
+            parts.push(i as f64 / size as f64);
+        }
+        parts
+    }
+
+    fn get_z_coords(&self) -> Vec<f64> {
+        let size = self.shape.z_size();
+        let mut parts = Vec::with_capacity(size as usize);
+        for i in 0..size {
+            parts.push(i as f64 / size as f64);
+        }
+        parts
     }
 }