Partial work on filling

Also includes code to better visualise normals from aligned sources.

applications/reconstruct/src/ilw/correspondence.cu

@@ -176,7 +176,8 @@ __global__ void mask_filter_kernel(
 	const int y = blockIdx.y*blockDim.y + threadIdx.y;
 
 	if (x >= 0 && x < depth.width() && y >=0 && y < depth.height()) {
-		if (mask.tex2D(x,y) > 0) {
+		Mask m(mask.tex2D(x,y));
+		if (m.isFilled()) {
 			depth(x,y) = MINF;
 		}
 	}