diff --git a/hlsl/Graphics/DdxCoarse.png b/hlsl/Graphics/DdxCoarse.png new file mode 100644 index 0000000..dd0f4ee Binary files /dev/null and b/hlsl/Graphics/DdxCoarse.png differ diff --git a/hlsl/Graphics/DdyCoarse.png b/hlsl/Graphics/DdyCoarse.png new file mode 100644 index 0000000..4d79d0a Binary files /dev/null and b/hlsl/Graphics/DdyCoarse.png differ