X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Flibr2c2%2Fterrain.cpp;h=5a317747e74f96f57f3b598e934ee2e2773a012e;hb=90015ce8f2b5d10135c3386c2771ee29395e3b37;hp=e84c7cdc1c360102a89fb60d92af868363e27d2f;hpb=2220ba2f11705ea9a4e480603d43ab7ed4cf5a89;p=r2c2.git

diff --git a/source/libr2c2/terrain.cpp b/source/libr2c2/terrain.cpp
index e84c7cd..5a31774 100644
--- a/source/libr2c2/terrain.cpp
+++ b/source/libr2c2/terrain.cpp
@@ -132,6 +132,11 @@ Vector Terrain::get_node_position(const NodeCoordinates &c) const
 
 Terrain::NodeCoordinates Terrain::get_closest_node(const Ray &ray) const
 {
+	Transform reverse_trans = Transform::rotation(rotation, Vector(0, 0, -1))*
+		Transform::translation(-position);
+	Ray local_ray = reverse_trans.transform(ray);
+
+	float ts = type.get_tile_size();
 	NodeCoordinates coords;
 	float closest_dist = -1;
 	for(unsigned y=0; y<height; ++y)
@@ -139,17 +144,16 @@ Terrain::NodeCoordinates Terrain::get_closest_node(const Ray &ray) const
 			for(unsigned i=0; i<4; ++i)
 			{
 				NodeCoordinates c(x, y, i);
-				/* XXX This is not very efficient.  Should transform the ray to
-				local coordinate system. */
-				Vector node_pos = get_node_position(c);
-				Vector v = node_pos-ray.get_start();
-				float dist = (v-ray.get_direction()*dot(ray.get_direction(), v)).norm();
+				Vector node_pos((x+0.25+(i%2)*0.5)*ts, (y+0.25+(i/2)*0.5)*ts, get_node_elevation(c));
+				Vector v = node_pos-local_ray.get_start();
+				float dist = (v-local_ray.get_direction()*dot(local_ray.get_direction(), v)).norm();
 				if(closest_dist<0 || dist<closest_dist)
 				{
 					coords = c;
 					closest_dist = dist;
 				}
 			}
+
 	return coords;
 }