diff --git a/voxel_buffer.cpp b/voxel_buffer.cpp
index 2e991a0..aceb6c4 100644
--- a/voxel_buffer.cpp
+++ b/voxel_buffer.cpp
@@ -4,6 +4,7 @@
 #include <string.h>
 
 VoxelBuffer::VoxelBuffer() {
+	_channels[CHANNEL_ISOLEVEL].defval = 1.0;
 }
 
 VoxelBuffer::~VoxelBuffer() {
diff --git a/voxel_map.cpp b/voxel_map.cpp
index c523b79..bcc45b6 100644
--- a/voxel_map.cpp
+++ b/voxel_map.cpp
@@ -13,6 +13,8 @@ VoxelMap::VoxelMap() :
 	for (unsigned int i = 0; i < VoxelBuffer::MAX_CHANNELS; ++i) {
 		_default_voxel[i] = 0;
 	}
+
+	_default_voxel[VoxelBuffer::CHANNEL_ISOLEVEL] = 1.0;
 }
 
 VoxelMap::~VoxelMap() {