Merge pull request #69 from kotofurumiya/fix/rotation-y-direction

Fix clockwise rotations in rotateY() and setRotationY().

Author: johnmccutchan

lib/src/vector_math/matrix4.dart

@@ -807,14 +807,14 @@ class Matrix4 {
   Matrix4 rotateY(double angle) {
     double cosAngle = Math.cos(angle);
     double sinAngle = Math.sin(angle);
-    var t1 = storage[0] * cosAngle + storage[8] * sinAngle;
-    var t2 = storage[1] * cosAngle + storage[9] * sinAngle;
-    var t3 = storage[2] * cosAngle + storage[10] * sinAngle;
-    var t4 = storage[3] * cosAngle + storage[11] * sinAngle;
-    var t5 = storage[0] * -sinAngle + storage[8] * cosAngle;
-    var t6 = storage[1] * -sinAngle + storage[9] * cosAngle;
-    var t7 = storage[2] * -sinAngle + storage[10] * cosAngle;
-    var t8 = storage[3] * -sinAngle + storage[11] * cosAngle;
+    var t1 = storage[0] * cosAngle + storage[8] * -sinAngle;
+    var t2 = storage[1] * cosAngle + storage[9] * -sinAngle;
+    var t3 = storage[2] * cosAngle + storage[10] * -sinAngle;
+    var t4 = storage[3] * cosAngle + storage[11] * -sinAngle;
+    var t5 = storage[0] * sinAngle + storage[8] * cosAngle;
+    var t6 = storage[1] * sinAngle + storage[9] * cosAngle;
+    var t7 = storage[2] * sinAngle + storage[10] * cosAngle;
+    var t8 = storage[3] * sinAngle + storage[11] * cosAngle;
     storage[0] = t1;
     storage[1] = t2;
     storage[2] = t3;
@@ -1348,11 +1348,11 @@ class Matrix4 {
     double s = Math.sin(radians);
     storage[0] = c;
     storage[1] = 0.0;
-    storage[2] = s;
+    storage[2] = -s;
     storage[4] = 0.0;
     storage[5] = 1.0;
     storage[6] = 0.0;
-    storage[8] = -s;
+    storage[8] = s;
     storage[9] = 0.0;
     storage[10] = c;
     storage[3] = 0.0;

lib/src/vector_math_64/matrix4.dart

@@ -807,14 +807,14 @@ class Matrix4 {
   Matrix4 rotateY(double angle) {
     double cosAngle = Math.cos(angle);
     double sinAngle = Math.sin(angle);
-    var t1 = storage[0] * cosAngle + storage[8] * sinAngle;
-    var t2 = storage[1] * cosAngle + storage[9] * sinAngle;
-    var t3 = storage[2] * cosAngle + storage[10] * sinAngle;
-    var t4 = storage[3] * cosAngle + storage[11] * sinAngle;
-    var t5 = storage[0] * -sinAngle + storage[8] * cosAngle;
-    var t6 = storage[1] * -sinAngle + storage[9] * cosAngle;
-    var t7 = storage[2] * -sinAngle + storage[10] * cosAngle;
-    var t8 = storage[3] * -sinAngle + storage[11] * cosAngle;
+    var t1 = storage[0] * cosAngle + storage[8] * -sinAngle;
+    var t2 = storage[1] * cosAngle + storage[9] * -sinAngle;
+    var t3 = storage[2] * cosAngle + storage[10] * -sinAngle;
+    var t4 = storage[3] * cosAngle + storage[11] * -sinAngle;
+    var t5 = storage[0] * sinAngle + storage[8] * cosAngle;
+    var t6 = storage[1] * sinAngle + storage[9] * cosAngle;
+    var t7 = storage[2] * sinAngle + storage[10] * cosAngle;
+    var t8 = storage[3] * sinAngle + storage[11] * cosAngle;
     storage[0] = t1;
     storage[1] = t2;
     storage[2] = t3;
@@ -1348,11 +1348,11 @@ class Matrix4 {
     double s = Math.sin(radians);
     storage[0] = c;
     storage[1] = 0.0;
-    storage[2] = s;
+    storage[2] = -s;
     storage[4] = 0.0;
     storage[5] = 1.0;
     storage[6] = 0.0;
-    storage[8] = -s;
+    storage[8] = s;
     storage[9] = 0.0;
     storage[10] = c;
     storage[3] = 0.0;