Merge branch 'master' into new_config_system

1 files changed, 5 insertions, 2 deletions

diff --git a/tools/viz/survive_viewer.js b/tools/viz/survive_viewer.js
index 56ef47f..075e56a 100644
--- a/tools/viz/survive_viewer.js
+++ b/tools/viz/survive_viewer.js
@@ -49,6 +49,9 @@ function add_lighthouse(idx, p, q) {
 	}
 
 function recolorTrackers(when) {
+    if(ctx == undefined)
+	return;
+    
 	for (var key in angles) {
 		var colors = [];
 
@@ -143,7 +146,7 @@ function redrawCanvas(when) {
 						ang[0][1] < when[key] - visible_tolerance)
 						continue;
 
-					var half_fov = 1.0472 * 2 / 5.;
+					var half_fov = 1.0472 * 2.;
 					var x = ang[0][0] / half_fov * canvas.width / 2 + canvas.width / 2;
 					var y = -ang[1][0] / half_fov * canvas.height / 2 + canvas.height / 2;
 
@@ -501,6 +504,6 @@ function animate() {
 	}
 
 function render() {
-	var use_fpv = $("#fpv")[0].checked;
+	var use_fpv = $("#fpv").length > 0 && $("#fpv")[0].checked;
 	renderer.render(scene, use_fpv ? fpv_camera : camera);
 }