diff --git a/include/PolyVox/PagedVolumeSampler.inl b/include/PolyVox/PagedVolumeSampler.inl
index fa9cdb10..5cff176a 100644
--- a/include/PolyVox/PagedVolumeSampler.inl
+++ b/include/PolyVox/PagedVolumeSampler.inl
@@ -23,14 +23,11 @@ freely, subject to the following restrictions:
 
 #include <array>
 
-#define CAN_GO_NEG_X(val) ((val % this->mVolume->m_uChunkSideLength != 0))
-//#define CAN_GO_POS_X(val) (((val + 1) % this->mVolume->m_uChunkSideLength != 0))
+#define CAN_GO_NEG_X(val) (this->m_uXPosInChunk > 0)
 #define CAN_GO_POS_X(val)  (this->m_uXPosInChunk < this->mVolume->m_uChunkSideLength-1)
-#define CAN_GO_NEG_Y(val) ((val % this->mVolume->m_uChunkSideLength != 0))
-//#define CAN_GO_POS_Y(val) (((val + 1) % this->mVolume->m_uChunkSideLength != 0))
+#define CAN_GO_NEG_Y(val) (this->m_uYPosInChunk > 0)
 #define CAN_GO_POS_Y(val)  (this->m_uYPosInChunk < this->mVolume->m_uChunkSideLength-1)
-#define CAN_GO_NEG_Z(val) ((val % this->mVolume->m_uChunkSideLength != 0))
-//#define CAN_GO_POS_Z(val) (((val + 1) % this->mVolume->m_uChunkSideLength != 0))
+#define CAN_GO_NEG_Z(val) (this->m_uZPosInChunk > 0)
 #define CAN_GO_POS_Z(val)  (this->m_uZPosInChunk < this->mVolume->m_uChunkSideLength-1)
 
 #define NEG_X_DELTA (-(deltaX[this->m_uXPosInChunk-1]))