Reduce server FOV with forward speed

This causes blocks in front of the player to be rendered sooner and blocks in the periphal view (that would soon be out of view) a bit later. Overall this leads to smoother rendering as the player is moving around.
minetest · Oct 26, 2017 · 0732bf7 · 0732bf7
1 parent 166ded4
commit 0732bf7
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/src/clientiface.cpp b/src/clientiface.cpp
@@ -125,7 +125,7 @@ void RemoteClient::GetNextBlocks (
 	if (playerspeed.getLength() > 1.0f * BS)
 		playerspeeddir = playerspeed / playerspeed.getLength();
 	// Predict to next block
-	v3f playerpos_predicted = playerpos + playerspeeddir*MAP_BLOCKSIZE*BS;
+	v3f playerpos_predicted = playerpos + playerspeeddir * (MAP_BLOCKSIZE * BS);
 
 	v3s16 center_nodepos = floatToInt(playerpos_predicted, BS);
 
@@ -196,6 +196,14 @@ void RemoteClient::GetNextBlocks (
 	s16 wanted_range = sao->getWantedRange() + 1;
 	float camera_fov = sao->getFov();
 
+	// cos(angle between velocity and camera) * |velocity|
+	// Limit to 0.0f in case player moves backwards.
+	f32 dot = rangelim(camera_dir.dotProduct(playerspeed), 0.0f, 300.0f);
+
+	// Reduce the field of view when a player moves and looks forward.
+	// limit max fov effect to 50%, 60% at 20n/s fly speed
+	camera_fov = camera_fov / (1 + dot / 300.0f);
+
 	const s16 full_d_max = std::min(m_max_send_distance, wanted_range);
 	const s16 d_opt = std::min(m_block_optimize_distance, wanted_range);
 	const s16 d_blocks_in_sight = full_d_max * BS * MAP_BLOCKSIZE;