Fixed issues with viewers.

client/src/material-mod/MaterialMod.js

@@ -367,31 +367,11 @@ class StructureViewerWrapper {
     // Determine the periodic indices
     let nPeriodic = 0;
     let periodicIndices = [];
-    let p1 = periodicity[0];
-    let p2 = periodicity[1];
-    let p3 = periodicity[2];
-
-    if (p1 && p2 && p3) {
-        nPeriodic = 3;
-    } else if (!p1 && !p2 && !p3) {
-        nPeriodic = 0;
-    } else {
-        for (let dim = 0; dim < 3; ++dim) {
-            let p1 = periodicity[dim];
-            let p2 = periodicity[(dim+1) % 3];
-            let p3 = periodicity[(dim+2) % 3];
-            if (p1 && !p2 && !p3) {
-                nPeriodic = 1;
-                periodicIndices.push(dim)
-                break;
-            }
-            else if (p1 && p2 && !p3) {
-                nPeriodic = 2;
-                periodicIndices.push(dim);
-                periodicIndices.push((dim+1) % 3);
-                break;
-            }
-        }
+    for (let i = 0; i < 3; ++i) {
+      if (periodicity[i]) {
+        periodicIndices.push(i)
+        ++nPeriodic
+      }
     }
 
     /**
@@ -407,7 +387,6 @@ class StructureViewerWrapper {
         return multiplier
     }
 
-
     // 2D:
     if (nPeriodic == 2) {
       let dim1 = periodicIndices[0]