+#include <simgear/math/sg_types.hxx>
+
+#include <simgear/math/SGMathFwd.hxx>
+#include <simgear/math/SGGeod.hxx>
+#include <simgear/math/SGVec2.hxx>
+
+/**
+ * Traverse the specified fan/strip/list of vertices and attempt to
+ * calculate "none stretching" texture coordinates.
+ * @param b the bucket containing the structure
+ * @param geod_nodes vertices in geodetic coordinates
+ * @param fan integer list of indices pointing into the vertex list
+ * @param scale (default = 1.0) scaling factor
+ * @return list of texture coordinates
+ */
+std::vector<SGVec2f> sgCalcTexCoords( const SGBucket& b, const std::vector<SGGeod>& geod_nodes,
+ const int_list& fan, double scale = 1.0 );