Cutouts fixed

stupid copying :-)

envelope.asy

@@ -60,9 +60,9 @@ real llbb = dot(llba, corners[2]);
 pair llta = (1, -1);
 real lltb = dot(llta, corners[2]);
 pair lrba = (1, -1);
-real lrbb = dot(llba, corners[0]);
+real lrbb = dot(lrba, corners[0]);
 pair lrta = (1, 1);
-real lrtb = dot(llta, corners[0]);
+real lrtb = dot(lrba, corners[0]);
 
 pair lineinters(pair l1a, real l1b, pair l2a, real l2b) {
 	// For some reason, solve does not like having the matrices right in the