panUp method
Implementation
void panUp(num distance, Matrix4 objectMatrix) {
if (scope.screenSpacePanning == true) {
v.setFromMatrixColumn(objectMatrix, 1);
} else {
v.setFromMatrixColumn(objectMatrix, 0);
v.cross2(scope.object.up, v);
}
v.scale(distance);
panOffset.add(v);
}