Scale Surface from NC (Normalized Coordinates) to strechted x.y.Plane * 10.

index.html

@@ -109,7 +109,7 @@
         void main(void) {
             vec4 displace = texture2D(displace_map, v_uv);
             //calculate normal
-            float gridPointDelta = 1. / 256.;
+            float gridPointDelta = (1. / 256.);
             vec3 currPoint = vec3(0.0,0.0,displace.x);
             vec3 right = vec3(gridPointDelta,0.0,texture2D(displace_map,vec2(v_uv.x + gridPointDelta,v_uv.y)).x);
             vec3 left = vec3(-gridPointDelta,0.0,texture2D(displace_map,vec2(v_uv.x - gridPointDelta,v_uv.y)).x);