diff --git a/dust3d.pro b/dust3d.pro
index e798d2e5..36190fca 100644
--- a/dust3d.pro
+++ b/dust3d.pro
@@ -12,10 +12,10 @@ macx {
 }
 
 isEmpty(HUMAN_VERSION) {
-	HUMAN_VERSION = "1.0.0-beta.14"
+	HUMAN_VERSION = "1.0.0-beta.15"
 }
 isEmpty(VERSION) {
-	VERSION = 1.0.0.14
+	VERSION = 1.0.0.15
 }
 
 REPOSITORY_URL = "https://github.com/huxingyi/dust3d"
@@ -25,7 +25,7 @@ REFERENCE_GUIDE_URL = "http://docs.dust3d.org"
 QMAKE_TARGET_COMPANY = Dust3D
 QMAKE_TARGET_PRODUCT = Dust3D
 QMAKE_TARGET_DESCRIPTION = "Dust3D is a cross-platform open-source 3D modeling software"
-QMAKE_TARGET_COPYRIGHT = "Copyright (C) 2018 Dust3D Project. All Rights Reserved."
+QMAKE_TARGET_COPYRIGHT = "Copyright (C) 2018-2019 Dust3D Project. All Rights Reserved."
 
 DEFINES += "PROJECT_DEFINED_APP_COMPANY=\"\\\"$$QMAKE_TARGET_COMPANY\\\"\""
 DEFINES += "PROJECT_DEFINED_APP_NAME=\"\\\"$$QMAKE_TARGET_PRODUCT\\\"\""
diff --git a/thirdparty/simpleuv/simpleuv/triangulate.cpp b/thirdparty/simpleuv/simpleuv/triangulate.cpp
index 52c38b8d..8869fc97 100644
--- a/thirdparty/simpleuv/simpleuv/triangulate.cpp
+++ b/thirdparty/simpleuv/simpleuv/triangulate.cpp
@@ -15,7 +15,7 @@ static QVector3D norm(const QVector3D &p1, const QVector3D &p2, const QVector3D
 
 static float angle360(const QVector3D &a, const QVector3D &b, const QVector3D &direct)
 {
-    auto angle = std::acos(QVector3D::dotProduct(a, b)) * 180.0 / 3.1415926;
+    auto angle = atan2(QVector3D::crossProduct(a, b).length(), QVector3D::dotProduct(a, b)) * 180.0 / 3.1415926;
     auto c = QVector3D::crossProduct(a, b);
     if (QVector3D::dotProduct(c, direct) < 0) {
         angle += 180;