Now initilize VTXBUFF_ACCRETION to 0.0, and accretion now works as expected.

src/standalone/model/host_memory.cc

@@ -71,7 +71,7 @@ acmesh_create(const AcMeshInfo& mesh_info)
     return mesh;
 }
 
-static void
+void
 vertex_buffer_set(const VertexBufferHandle& key, const AcReal& val, AcMesh* mesh)
 {
     const int n = acVertexBufferSize(mesh->info);

src/standalone/model/host_memory.h

@@ -48,6 +48,8 @@ extern const char* init_type_names[]; // Defined in host_memory.cc
 
 AcMesh* acmesh_create(const AcMeshInfo& mesh_info);
 
+void vertex_buffer_set(const VertexBufferHandle& key, const AcReal& val, AcMesh* mesh);
+
 void acmesh_clear(AcMesh* mesh);
 
 void acmesh_init_to(const InitType& type, AcMesh* mesh);