grid test

tests/include/igl/grid.cpp

@@ -0,0 +1,40 @@
+#include <test_common.h>
+#include <igl/grid.h>
+#include <igl/matlab_format.h>
+
+TEST(grid,3d)
+{
+  Eigen::Vector3i res(3,3,3);
+  Eigen::MatrixXd GV;
+  igl::grid(res,GV);
+  const Eigen::MatrixXd GVgt = 
+    (Eigen::MatrixXd(27,3)<<
+      0,  0,  0,
+    0.5,  0,  0,
+      1,  0,  0,
+      0,0.5,  0,
+    0.5,0.5,  0,
+      1,0.5,  0,
+      0,  1,  0,
+    0.5,  1,  0,
+      1,  1,  0,
+      0,  0,0.5,
+    0.5,  0,0.5,
+      1,  0,0.5,
+      0,0.5,0.5,
+    0.5,0.5,0.5,
+      1,0.5,0.5,
+      0,  1,0.5,
+    0.5,  1,0.5,
+      1,  1,0.5,
+      0,  0,  1,
+    0.5,  0,  1,
+      1,  0,  1,
+      0,0.5,  1,
+    0.5,0.5,  1,
+      1,0.5,  1,
+      0,  1,  1,
+    0.5,  1,  1,
+      1,  1,  1).finished();
+  test_common::assert_eq(GV,GVgt);
+}