fix : normal transformation instead of normal rotation

src/Mesh/babylon.groundMesh.ts

@@ -101,8 +101,7 @@
                 this._computeHeightQuads();
             }
             var facet = this._getFacetAt(x, z);
-            world.getRotationMatrixToRef(tmpMat);       // just rotates the normals
-            Vector3.TransformCoordinatesFromFloatsToRef(facet.x, facet.y, facet.z, tmpMat, ref);
+            Vector3.TransformNormalFromFloatsToRef(facet.x, facet.y, facet.z, world, ref);
             return this;
         }
 

src/Mesh/babylon.mesh.ts

@@ -1937,8 +1937,7 @@
          */
         public getFacetNormalToRef(i: number, ref: Vector3) {
             var localNorm = (this.getFacetLocalNormals())[i];
-            (this.getWorldMatrix()).getRotationMatrixToRef(Tmp.Matrix[0]);
-            Vector3.TransformCoordinatesToRef(localNorm, Tmp.Matrix[0], ref);
+            Vector3.TransformNormalToRef(localNorm, this.getWorldMatrix(), ref);
             return this;
         }
         /** 

src/Particles/babylon.solidParticleSystem.ts

@@ -663,10 +663,9 @@
                             this._normal.y = this._fixedNormal32[idx + 1];
                             this._normal.z = this._fixedNormal32[idx + 2];
 
-                            this._w = (this._normal.x * this._rotMatrix.m[3]) + (this._normal.y * this._rotMatrix.m[7]) + (this._normal.z * this._rotMatrix.m[11]) + this._rotMatrix.m[15];
-                            this._rotated.x = ((this._normal.x * this._rotMatrix.m[0]) + (this._normal.y * this._rotMatrix.m[4]) + (this._normal.z * this._rotMatrix.m[8]) + this._rotMatrix.m[12]) / this._w;
-                            this._rotated.y = ((this._normal.x * this._rotMatrix.m[1]) + (this._normal.y * this._rotMatrix.m[5]) + (this._normal.z * this._rotMatrix.m[9]) + this._rotMatrix.m[13]) / this._w;
-                            this._rotated.z = ((this._normal.x * this._rotMatrix.m[2]) + (this._normal.y * this._rotMatrix.m[6]) + (this._normal.z * this._rotMatrix.m[10]) + this._rotMatrix.m[14]) / this._w;
+                            this._rotated.x = ((this._normal.x * this._rotMatrix.m[0]) + (this._normal.y * this._rotMatrix.m[4]) + (this._normal.z * this._rotMatrix.m[8]) + this._rotMatrix.m[12]);
+                            this._rotated.y = ((this._normal.x * this._rotMatrix.m[1]) + (this._normal.y * this._rotMatrix.m[5]) + (this._normal.z * this._rotMatrix.m[9]) + this._rotMatrix.m[13]);
+                            this._rotated.z = ((this._normal.x * this._rotMatrix.m[2]) + (this._normal.y * this._rotMatrix.m[6]) + (this._normal.z * this._rotMatrix.m[10]) + this._rotMatrix.m[14]);
 
                             this._normals32[idx] = this._cam_axisX.x * this._rotated.x + this._cam_axisY.x * this._rotated.y + this._cam_axisZ.x * this._rotated.z;
                             this._normals32[idx + 1] = this._cam_axisX.y * this._rotated.x + this._cam_axisY.y * this._rotated.y + this._cam_axisZ.y * this._rotated.z;