diff --git a/editor.scn b/editor.scn
index cbf147f..c405301 100644
--- a/editor.scn
+++ b/editor.scn
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:332a300c24da15e6ece7e0fe4ee07e394939d953e8ba482613ebc1fd70cc579e
-size 5103
+oid sha256:009f7c0a98085bc2a1824ed2ce45223036b7b3f24df477178e1967a935b87971
+size 5105
diff --git a/terrain_instance_3d.gd b/terrain_instance_3d.gd
index ee409da..c53cbc4 100644
--- a/terrain_instance_3d.gd
+++ b/terrain_instance_3d.gd
@@ -58,7 +58,7 @@ var size: Vector2i = Vector2i.ZERO:
 				RenderingServer.instance_set_base(self.get_instance(),
 					surface_tool.commit(self._mesh).get_rid())
 
-				self._material.set_shader_parameter("AREA", Vector2(value))
+				self._material.set_shader_parameter("SIZE", Vector2(value))
 				self._mesh.surface_set_material(0, self._material)
 
 		size = value
diff --git a/terrain_shader.gdshader b/terrain_shader.gdshader
index 6073c56..2fca663 100644
--- a/terrain_shader.gdshader
+++ b/terrain_shader.gdshader
@@ -1,7 +1,5 @@
 shader_type spatial;
 
-uniform vec2 AREA;
-
 uniform sampler2D LAYER_1_ALBEDO : hint_default_black;
 
 uniform sampler2D LAYER_1_NORMAL_MAP : hint_default_black;
@@ -20,10 +18,12 @@ uniform sampler2D LAYER_4_NORMAL_MAP : hint_default_black;
 
 uniform float MAX_HEIGHT = 100.0;
 
+uniform vec2 SIZE;
+
 uniform sampler2D TERRAIN_MAP : hint_default_transparent, repeat_disable;
 
 void fragment() {
-	vec2 uv = UV * AREA;
+	vec2 uv = UV * SIZE;
 	vec2 uv_alt = uv * -0.25;
 	vec3 splat_map = texture(TERRAIN_MAP, UV).rgb;
 	float blank = clamp(1.0 - splat_map.r - splat_map.g - splat_map.b, 0.0, 1.0);
@@ -46,10 +46,11 @@ float height(vec2 uv) {
 void vertex() {
 	VERTEX.y = height(UV);
 
-	float left = height(vec2(UV.x - 1.0, UV.y));
-	float right = height(vec2(UV.x + 1.0, UV.y));
-	float forward = height(vec2(UV.x, UV.y + 1.0));
-	float backward = height(vec2(UV.x, UV.y - 1.0));
+	vec2 texel = vec2(1.0, 1.0) / SIZE;
+	float left = height(vec2(UV.x - texel.x, UV.y));
+	float right = height(vec2(UV.x + texel.x, UV.y));
+	float forward = height(vec2(UV.x, UV.y + texel.y));
+	float backward = height(vec2(UV.x, UV.y - texel.y));
 
 	NORMAL = normalize(vec3(left - right, 2.0, forward - forward));
 }