Added to_matrix() to blendshapes

include/eos/morphablemodel/Blendshape.hpp

@@ -29,6 +29,8 @@
 #include "opencv2/core/core.hpp"
 
 #include <string>
+#include <vector>
+#include <cassert>
 #include <fstream>
 
 namespace eos {
@@ -81,6 +83,24 @@ std::vector<Blendshape> load_blendshapes(std::string filename)
 	return blendshapes;
 };
 
+/**
+ * @brief Copies the blendshapes into a matrix, with each column being a blendshape.
+ *
+ * @param[in] blendshapes Vector of blendshapes.
+ * @return The resulting matrix.
+ */
+cv::Mat to_matrix(const std::vector<Blendshape>& blendshapes)
+{
+	// assert: all blendshapes have to have the same number of rows, and one col
+	assert(blendshapes.size() > 0);
+	cv::Mat blendshapes_as_basis(blendshapes[0].deformation.rows, blendshapes.size(), CV_32FC1);
+	for (int i = 0; i < blendshapes.size(); ++i)
+	{
+		blendshapes[i].deformation.copyTo(blendshapes_as_basis.col(i));
+	}
+	return blendshapes_as_basis;
+};
+
 	} /* namespace morphablemodel */
 } /* namespace eos */