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diff --git a/intern/libmv/libmv/multiview/resection_test.cc b/intern/libmv/libmv/multiview/resection_test.cc
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+// Copyright (c) 2009 libmv authors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#include <iostream>
+
+#include "libmv/multiview/projection.h"
+#include "libmv/multiview/resection.h"
+#include "libmv/multiview/test_data_sets.h"
+#include "libmv/numeric/numeric.h"
+#include "testing/testing.h"
+#include "libmv/logging/logging.h"
+
+namespace {
+
+using namespace libmv;
+using namespace libmv::resection;
+
+TEST(Resection, ThreeViews) {
+  int nviews = 5;
+  int npoints = 6;
+  NViewDataSet d = NRealisticCamerasFull(nviews, npoints);
+  for (int i = 0; i < nviews; ++i) {
+    Mat4X X(4, npoints);
+    X.block(0, 0, 3, npoints) = d.X;
+    X.row(3).setOnes();
+    const Mat2X &x = d.x[i];
+    Mat34 P;
+    Resection(x, X, &P);
+    Mat34 P_expected = d.P(i);
+
+    // Because the P matrices are homogeneous, it is necessary to be tricky
+    // about the scale factor to make them match.
+    P_expected *= 1/P_expected.array().abs().sum();
+    P *= 1/P.array().abs().sum();
+    if (!((P(0, 0) > 0 && P_expected(0, 0) > 0) ||
+          (P(0, 0) < 0 && P_expected(0, 0) < 0))) {
+      P *= -1;
+    }
+
+    EXPECT_MATRIX_NEAR(P_expected, P, 1e-9);
+  }
+}
+
+}  // namespace