From c76931ebfd762730c2f27ae93763e190b2dcda8b Mon Sep 17 00:00:00 2001
From: nokonoko1203 <healtheworld.1203@gmail.com>
Date: Thu, 14 Dec 2023 11:24:12 +0900
Subject: [PATCH] assign vertex ids buffer

---
 nusamai-gltf/examples/object_to_gltf.rs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/nusamai-gltf/examples/object_to_gltf.rs b/nusamai-gltf/examples/object_to_gltf.rs
index bc6435485..7c35ef72c 100644
--- a/nusamai-gltf/examples/object_to_gltf.rs
+++ b/nusamai-gltf/examples/object_to_gltf.rs
@@ -289,9 +289,11 @@ fn make_gltf_json(triangles: &Triangles) -> String {
 fn make_binary_buffer(triangles: &Triangles) -> Vec<u8> {
     let indices = &triangles.indices;
     let vertices = &triangles.vertices;
+    let vertex_ids = &triangles.vertex_ids;
 
     let mut indices_buf = Vec::new();
     let mut vertices_buf = Vec::new();
+    let mut vertex_ids_buf = Vec::new();
 
     // glTFのバイナリはリトルエンディアン
     for index in indices {
@@ -306,7 +308,14 @@ fn make_binary_buffer(triangles: &Triangles) -> Vec<u8> {
         }
     }
 
-    [&indices_buf[..], &vertices_buf[..]].concat()
+    if let Some(vertex_ids) = vertex_ids {
+        for vertex_id in vertex_ids {
+            vertex_ids_buf
+                .write_u64::<LittleEndian>(*vertex_id)
+                .unwrap();
+        }
+    }
+    [&indices_buf[..], &vertices_buf[..], &vertex_ids_buf[..]].concat()
 }
 
 fn tessellation(