Added fog and implemented a simple skybox.

1 files changed, 9 insertions, 8 deletions

diff --git a/terrain.cpp b/terrain.cpp
index 359cb84..35aef58 100644
--- a/terrain.cpp
+++ b/terrain.cpp
@@ -507,16 +507,17 @@ void Terrain::raise(float x, float z, float radius, float focus, float strength,
 }
 
 void Terrain::update(float x, float z) {
+	const int chunk_dist_threshold = chunk_size*4;
 	std::set<std::pair<int, int> > chunk_indices;
-	int i = x - 100;
+	int i = x - chunk_dist_threshold;
 	i -= i % chunk_size;
-	for(; i < x + 100; i += chunk_size) {
-		int j = z - 100;
+	for(; i < x + chunk_dist_threshold; i += chunk_size) {
+		int j = z - chunk_dist_threshold;
 		j -= j % chunk_size;
-		for(; j < z + 100; j += chunk_size) {
-			float a = i - x;
-			float b = j - z;
-			if(sqrtf(a*a + b*b) < 100)
+		for(; j < z + chunk_dist_threshold; j += chunk_size) {
+			float a = i - x + chunk_size/2;
+			float b = j - z + chunk_size/2;
+			if(sqrtf(a*a + b*b) < chunk_dist_threshold)
 				chunk_indices.insert(std::pair<int, int>(i, j));
 		}
 	}
@@ -525,7 +526,7 @@ void Terrain::update(float x, float z) {
 		if(ind_it != chunk_indices.end()) {
 			chunk_indices.erase(ind_it);
 		}
-		if((*it)->distance(x, z) > 100) {
+		if((*it)->distance(x, z) > chunk_dist_threshold) {
 			it = chunks.erase(it);
 		}
 	}