From ebf3a952d89c38adacfb1ff8d36dbd7732597338 Mon Sep 17 00:00:00 2001
From: zhouhang95 <765229842@qq.com>
Date: Thu, 29 Aug 2024 15:37:46 +0800
Subject: [PATCH] abc-not-flip-lines

---
 projects/Alembic/GetAlembicPrim.cpp      | 8 ++++----
 zeno/include/zeno/funcs/PrimitiveUtils.h | 2 +-
 zeno/src/nodes/neo/PrimFlipFaces.cpp     | 6 +++---
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/projects/Alembic/GetAlembicPrim.cpp b/projects/Alembic/GetAlembicPrim.cpp
index a8304e82a8..667c943df6 100644
--- a/projects/Alembic/GetAlembicPrim.cpp
+++ b/projects/Alembic/GetAlembicPrim.cpp
@@ -159,7 +159,7 @@ struct GetAlembicPrim : INode {
             prim = get_alembic_prim(abctree, index);
         }
         if (get_input2<bool>("flipFrontBack")) {
-            primFlipFaces(prim.get());
+            primFlipFaces(prim.get(), true);
         }
         if (get_input2<bool>("triangulate")) {
             zeno::primTriangulate(prim.get());
@@ -198,7 +198,7 @@ struct AllAlembicPrim : INode {
         }
         auto outprim = zeno::primMerge(prims->getRaw<PrimitiveObject>());
         if (get_input2<bool>("flipFrontBack")) {
-            primFlipFaces(outprim.get());
+            primFlipFaces(outprim.get(), true);
         }
         if (get_input2<int>("triangulate") == 1) {
             zeno::primTriangulate(outprim.get());
@@ -297,7 +297,7 @@ struct AlembicPrimList : INode {
         for (auto &prim: new_prims->arr) {
             auto _prim = std::dynamic_pointer_cast<PrimitiveObject>(prim);
             if (get_input2<bool>("flipFrontBack")) {
-                primFlipFaces(_prim.get());
+                primFlipFaces(_prim.get(), true);
             }
             if (get_input2<bool>("splitByFaceset") && get_input2<bool>("killDeadVerts")) {
                 primKillDeadVerts(_prim.get());
@@ -457,7 +457,7 @@ struct ImportAlembicPrim : INode {
                 outprim = get_alembic_prim(abctree, index);
             }
         }
-        primFlipFaces(outprim.get());
+        primFlipFaces(outprim.get(), true);
         if (get_input2<bool>("triangulate")) {
             zeno::primTriangulate(outprim.get());
         }
diff --git a/zeno/include/zeno/funcs/PrimitiveUtils.h b/zeno/include/zeno/funcs/PrimitiveUtils.h
index 2fca7e1614..39585e683d 100644
--- a/zeno/include/zeno/funcs/PrimitiveUtils.h
+++ b/zeno/include/zeno/funcs/PrimitiveUtils.h
@@ -16,7 +16,7 @@ ZENO_API void primPolygonate(PrimitiveObject *prim, bool with_uv = true);
 ZENO_API void primSepTriangles(PrimitiveObject *prim, bool smoothNormal = true, bool keepTriFaces = true);
 //ZENO_API void primSmoothNormal(PrimitiveObject *prim, bool isFlipped = false);
 
-ZENO_API void primFlipFaces(PrimitiveObject *prim);
+ZENO_API void primFlipFaces(PrimitiveObject *prim, bool only_face = false);
 ZENO_API void primCalcNormal(PrimitiveObject *prim, float flip = 1.0f, std::string nrmAttr = "nrm");
 //ZENO_API void primCalcInsetDir(PrimitiveObject *prim, float flip = 1.0f, std::string nrmAttr = "nrm");
 
diff --git a/zeno/src/nodes/neo/PrimFlipFaces.cpp b/zeno/src/nodes/neo/PrimFlipFaces.cpp
index 44bbd6a711..e37b0bd6fb 100644
--- a/zeno/src/nodes/neo/PrimFlipFaces.cpp
+++ b/zeno/src/nodes/neo/PrimFlipFaces.cpp
@@ -10,8 +10,8 @@
 
 namespace zeno {
 
-ZENO_API void primFlipFaces(PrimitiveObject *prim) {
-    if (prim->lines.size())
+ZENO_API void primFlipFaces(PrimitiveObject *prim, bool only_face) {
+    if (!only_face && prim->lines.size())
         parallel_for_each(prim->lines.begin(), prim->lines.end(), [&] (auto &line) {
             std::swap(line[1], line[0]);
         });
@@ -47,7 +47,7 @@ ZENO_API void primFlipFaces(PrimitiveObject *prim) {
 struct PrimFlipFaces : zeno::INode {
     virtual void apply() override {
         auto prim = get_input<PrimitiveObject>("prim");
-        primFlipFaces(prim.get());
+        primFlipFaces(prim.get(), false);
         set_output("prim", std::move(prim));
     }
 };