Added a simple contour fitting that fits the camera-facing contour

- Updated ibug2did.txt with a description of the contour indices
- Added a file describing the left and right model contours (the face outline) on the reference model
- Caveat: The implementation is a bit poorly documented for now

CMakeLists.txt

@@ -98,6 +98,7 @@ set(HEADERS
 	include/eos/fitting/nonlinear_camera_estimation.hpp
 	include/eos/fitting/detail/nonlinear_camera_estimation_detail.hpp
 	include/eos/fitting/linear_shape_fitting.hpp
+	include/eos/fitting/contour_correspondence.hpp
 	include/eos/render/Mesh.hpp
 	include/eos/render/utils.hpp
 	include/eos/render/render.hpp

share/ibug2did.txt

@@ -22,3 +22,26 @@ landmarkMappings ; A mapping from input landmarks (iBug, lhs) to output landmark
 	55   812 ; left mouth corner (13)
 	58   411 ; lower lip middle bottom (17)
 }
+contour_landmarks
+{
+	right {
+		1
+		2
+		3
+		4
+		5
+		6
+		7
+		8
+	}
+	left {
+		10
+		11
+		12
+		13
+		14
+		15
+		16
+		17
+	}
+}
\ No newline at end of file

share/model_contours.json

+{
+    "model_contour": {
+        "right_contour": [
+            380,
+            373,
+            356,
+            358,
+            359,
+            360,
+            365,
+            363,
+            364,
+            388,
+            391,
+            392,
+            393,
+            11,
+            21,
+            25,
+            22
+        ],
+        "left_contour": [
+            795,
+            790,
+            773,
+            775,
+            776,
+            777,
+            782,
+            780,
+            781,
+            802,
+            805,
+            806,
+            807,
+            454,
+            464,
+            466,
+            465
+        ]
+    }
+}
\ No newline at end of file