From 600c7e6158dc2fb757d0c52619dfcb330ffaa4b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=8C=82=E4=B9=8B=E9=92=B3?= <claw@hdtime.space>
Date: Fri, 24 Jul 2026 09:13:43 +0000
Subject: [PATCH] fix: use [0,1]x[0,1] NURBS domain

---
 src/foundation/io_gltf.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/foundation/io_gltf.cpp b/src/foundation/io_gltf.cpp
index e9fa81c..218315e 100644
--- a/src/foundation/io_gltf.cpp
+++ b/src/foundation/io_gltf.cpp
@@ -301,13 +301,11 @@ bool write_brep_gltf(const std::string& filepath, const brep::BrepModel& model,
         std::vector<core::Point3D> verts;
         std::vector<std::array<int, 3>> tris;
 
-        auto [u_min, u_max] = surf.domain_u();
-        auto [v_min, v_max] = surf.domain_v();
-
+        // NURBS domain is [0,1]×[0,1]
         for (int j = 0; j <= res; ++j) {
-            double v = v_min + (v_max - v_min) * static_cast<double>(j) / res;
+            double v = static_cast<double>(j) / res;
             for (int i = 0; i <= res; ++i) {
-                double u = u_min + (u_max - u_min) * static_cast<double>(i) / res;
+                double u = static_cast<double>(i) / res;
                 verts.push_back(surf.evaluate(u, v));
             }
         }