X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fmath%2Fvector.hxx;h=b4cbb2f304a27ece653afd354694aa843b32f95a;hb=6a7c2000027cd22eea603e936ddbad1a5bfc8b04;hp=cec24236dc8fc0b472b85a1ceef64c1dbe6907f7;hpb=dcb95d131bc6aef1abe25d1f415e309f06e52436;p=simgear.git

diff --git a/simgear/math/vector.hxx b/simgear/math/vector.hxx
index cec24236..b4cbb2f3 100644
--- a/simgear/math/vector.hxx
+++ b/simgear/math/vector.hxx
@@ -38,7 +38,17 @@
 
 
 /**
- * Map a vector onto a plane.
+ * calculate the projection, p, of u along the direction of d.
+ * @param p (out) the projection
+ * @param u (in) the vector to be projected
+ * @param d (in) the direction onto which we project
+ */
+void sgProjection(sgVec3 p, const sgVec3 u, const sgVec3 d);
+void sgProjection(sgdVec3 p, const sgdVec3 u, const sgdVec3 d);
+
+
+/**
+ * Map i.e. project a vector onto a plane.
  * @param normal (in) normal vector for the plane
  * @param v0 (in) a point on the plane
  * @param vec (in) the vector to map onto the plane