M2.5: ShaderMaterial + texture resolution + fog; multi-skeleton verified

- m2_material: Metin2-style ShaderMaterial. blend_mix shader (opaque /
  alpha-blend / alpha-test-cutout via `mode` uniform) + blend_add shader
  (additive glow). modulate(tex, COORD) * COLOR, diffuse_lambert.
- Metin2Model: material_mode prop ("metin2" ShaderMaterial | "standard");
  _resolve_texture does filename-convention + case-insensitive dir scan of
  *.dds (face/hair keyword slots, stem match, fallback); set_surface_texture
  override; guess_blend heuristic (hair->cutout, cape->alpha, effect->add).
  Texture cache. Fixed opaque path to NOT alpha-discard (was hiding bodies).
- harness: AABB-based camera framing, engine depth fog (MTGODOT_FOG=1),
  MTGODOT_ANIM_T fixed-pose capture (needs explicit anim reload first),
  MTGODOT_AUTOSHOT batch screenshot.

Verified: warrior 5/5 surfaces textured under the shader (t=9 dance pose,
lit, fogged). assassin 17/17 textured via dir scan. shaman_lord (gr2 v7)
renders. Screenshots test/golden/m25-*.png, m2c-t*.png.

Gap (M2.5 gate not closed): libgr2 POD API exposes no material/texture-name/
blend data, so multi-slot -> texture/blend mapping is heuristic only. Needs
a libgr2 material API (gr2_material.cpp walking the type tree) — same gap as
xrender-poc M1 T5. Documented in docs/GODOT-POC-PLAN.md §M2.5 T2.5.6.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WaHYEY9rwLWt21PULiYjeJ

README.md

@@ -19,16 +19,22 @@
 
 ## 现状
 
-- [~] **M0'** — 脚手架（macOS）。本机已验证：
-  - **T0.1** GDExtension 加载、`Metin2Model` 注册成功
-    （`[mtgodot] Metin2Model registered OK`）。
-  - **T0.2** `libgr2` 链接进扩展且可调用：`probe_gr2(warrior_cheongrin.gr2)
-    → gr2 OK: format_version=6 sections=8`。
-  - **T0.3** Godot 4.7 工程（orbit 相机 + `DirectionalLight3D` 阴影 +
-    `WorldEnvironment` procedural sky + 占位 cube）经 Metal Forward+ 出画
-    （`test/golden/m0-scaffold.png`）。
-  - **T0.4** `export_presets.cfg`（macOS）就位；实际 `export` 待安装 4.7.1
-    导出模板（`godot --headless --install-export-templates`）。
+- [x] **M0'** — 脚手架。GDExtension 加载 + `Metin2Model` 注册 + `libgr2` 链接可调用
+  + Godot 4.7 工程经 Metal Forward+ 出画。T0.4 实际 `export` 待装 4.7.1 导出模板。
+- [x] **M1** — 静态渲染。`gr2` → `Skeleton3D` + `ArrayMesh` + `Skin` + 材质。
+  `warrior_cheongrin`（75 骨 / 5 表面 / 3324 顶点）正立、朝 +Z、贴图正确
+  （`test/golden/m1-bindpose.png`）。多骨架：`warrior_lord`(v6,74)、`assassin`(v6,95,17 表面)、
+  `shaman_lord`(**v7**,93) 均正确加载渲染。
+- [x] **M2** — 骨骼动画。`Metin2AnimPlayer` `_process` 里 `gr2::sample_pose`（跨文件）
+  → `Skeleton3D.set_bone_global_pose`，Godot GPU 蒙皮。`dance01`（28.3s / 74 track）
+  播放，`selfcheck` 25 采样 0 NaN，t=2/9/16/23 姿势各异（`test/golden/m2c-*.png`）。
+- [~] **M2.5** — 材质与观感保真。`ShaderMaterial`（modulate tex×COLOR×light、
+  opaque/alpha/alpha-test/add 四模式）+ 目录扫描贴图解析 + 方向光阴影 + procedural sky
+  + 引擎雾（`test/golden/m25-*.png`）。**门禁未闭**：多材质槽 → 贴图/混合的精确映射需
+  给 libgr2 加材质 API（见 `docs/GODOT-POC-PLAN.md` §M2.5 T2.5.6 差距清单）。
+- [ ] **中期评审** — 待 M2.5 门禁 + 对拍报告
+
+对拍（与 `xrender-poc` bgfx demo / oracle 逐帧）尚未接线，是中期评审前的下一步。
 
 ---
 

docs/GODOT-POC-PLAN.md

@@ -294,5 +294,17 @@ mtgodot-poc/
 ## 选型变更记录
 
 - 2026-08-29 · 范围收敛为 **Phase 1 = macOS only**；新增 **M2.5 材质与观感保真** 作为 Phase 1 核心门禁；动画 A/B 决策推迟到 Phase 2；Godot 版本钉死 4.7.1 / godot-cpp 4.7。
-- *(待 M1 T1.3 填写：贴图走 `.dds` 原生导入 还是运行时 `dds_loader`)*
-- *(待 M2.5 T2.5.6 填写：材质无法 1:1 还原项清单)*
+- 2026-08-29 · **M1 T1.3**：贴图走 **运行时 `dds_loader`**（`src/dxt.cpp`，端口自 xrender-poc）。理由：Godot 4 的 `Image.load()` 不支持 `.dds`，且资产从 `res://` 外的绝对路径加载（`.gr2` 走 `.gdignore` 同理）。DXT1/3/5 + BGRA8，level 0 + `generate_mipmaps()`。
+- 2026-08-29 · **动画方案**：确认走 **B 方案** —— `_process` 里 `gr2::sample_pose` → `Skeleton3D.set_bone_global_pose(i, gr2_to_godot(world[i]))`，Godot GPU 蒙皮 `skin_matrix = global_pose(i) * bind_pose(i)` 恒等于 gr2 deformer 矩阵（`gr2_bridge.h` 有推导）。A 方案（烘 `Animation`）仍推迟到 Phase 2 按多角色 CPU 采样决定。
+- 2026-08-29 · **坐标/单位**：`gr2_to_godot()` = gr2 行主序 Mat4 的 4×4 转置 → Godot `Transform3D`；Z-up cm → Y-up m（`rotate(-90°,X)` + `scale(0.01)`）放在 `Metin2Model` 节点自身 transform（`make_conv`）。warrior/warrior_lord/assassin/shaman_lord 实测 `flip_z=false`、`flip_winding=false`、`unit_scale=0.01` 正立、朝 +Z、无镜像。
+
+### M2.5 T2.5.6 — 材质无法 1:1 还原 / 待办项清单
+
+| 项 | 现状 | 影响 | 出路 |
+|---|---|---|---|
+| **libgr2 POD API 不暴露材质数据** —— 只有 `material_count`/`texture_count`，无材质名、无贴图文件名、无 texture-stage op、无 `D3DBLEND_*`/alpha-test 标志 | 贴图靠**文件名约定 + 目录大小写不敏感扫描**（`_resolve_texture`）；blend 靠**表面名关键字启发式**（`guess_blend`：hair→alpha-test、cape/skirt→alpha、effect/glow→add，其余 opaque） | warrior 5/5、assassin 17/17、shaman 1/1 表面命中贴图，但**多材质槽 → 具体贴图/混合的精确映射做不到**；换皮/多贴图变体、精确 alpha-test 阈值、MODULATE2X/ADDSIGNED 等 stage op 无法复现 | **需要给 libgr2 加材质 API**（新文件 `gr2_material.cpp`，走类型树取 `Materials[].Name` + `Maps[].Texture.FromFileName` + shader/blend hint）。这也正是 xrender-poc M1 T5「多 stage 材质对拍待 oracle」的同一缺口，两条 route 共用修法。 |
+| **顶点色** | `gr2::Vertex` POD 无 color 字段；shader 已留 `COLOR` 通道，默认白 | Metin2 PC 模型基本不用顶点色，影响小；特效/地形会用 | libgr2 若暴露则 `build_mesh` 补 `ARRAY_COLOR` |
+| **`TriGroup.material_index` 未接线** | libgr2 已解析每个三角组的 material_index，但 `build_mesh` 目前一个 gr2 mesh = 一个 surface（未按 material_index 再拆分） | 单 mesh 内多材质的模型会用同一张贴图 | `build_mesh` 按 `tri_groups` 的 material_index 分 surface（有材质 API 后一起做） |
+| **ShaderMaterial 静态 `Shader` 退出泄漏** | `shader_for()` 用 function-static `Ref<Shader>`，Godot 退出时报 "1 shader never freed" | 仅退出时一条 warning，无功能影响 | 改成每材质自持 Shader，或注册 cleanup |
+| **alpha 排序 corner case** | 半透明/additive 用 `render_priority` 粗排，未做逐三角/OIT | 多层半透明部件可能穿插 | 记录，不追求 100%（Phase 2 M2.5 打磨） |
+| **法线未做逆转置** | 走 Godot GPU 蒙皮，其法线处理与 Granny runtime 的「上 3×3 不逆转置」近似不完全一致 | 非均匀缩放骨骼下法线略有差异；warrior 类资产无明显问题 | Phase 2 逐帧对拍时量化 |

extension/CMakeLists.txt

@@ -25,6 +25,7 @@ add_library(mtgodot SHARED
     src/metin2_model.cpp
     src/metin2_anim.cpp
     src/gr2_bridge.cpp
+    src/m2_material.cpp
     src/dxt.cpp
 )
 target_compile_features(mtgodot PRIVATE cxx_std_20)

extension/src/m2_material.cpp

@@ -0,0 +1,95 @@
+#include "m2_material.h"
+
+#include <godot_cpp/classes/shader.hpp>
+#include <godot_cpp/classes/shader_material.hpp>
+#include <godot_cpp/classes/texture2d.hpp>
+#include <godot_cpp/variant/color.hpp>
+
+using namespace godot;
+
+namespace mtgodot {
+namespace {
+
+// blend_mix shader: covers opaque (mode 0, alpha-scissor) and alpha (mode 1).
+const char *SRC_MIX = R"(shader_type spatial;
+render_mode blend_mix, depth_draw_opaque, cull_disabled, diffuse_lambert, specular_disabled;
+
+uniform sampler2D albedo_tex : source_color, filter_linear_mipmap, repeat_enable;
+uniform bool use_texture = true;
+uniform vec4 modulate : source_color = vec4(1.0);
+uniform float alpha_scissor : hint_range(0.0, 1.0) = 0.5;
+uniform int mode = 0; // 0 opaque | 1 alpha-blend | 2 alpha-test (cutout)
+
+void fragment() {
+	vec4 c = use_texture ? texture(albedo_tex, UV) : vec4(1.0);
+	c *= modulate * COLOR;
+	if (mode == 2 && c.a < alpha_scissor) {
+		discard;
+	}
+	ALBEDO = c.rgb;
+	ALPHA = (mode == 1) ? c.a : 1.0;
+}
+)";
+
+// blend_add shader: additive glow (effects, enchant overlays).
+const char *SRC_ADD = R"(shader_type spatial;
+render_mode blend_add, depth_draw_opaque, depth_test_disabled, cull_disabled, unshaded;
+
+uniform sampler2D albedo_tex : source_color, filter_linear_mipmap, repeat_enable;
+uniform bool use_texture = true;
+uniform vec4 modulate : source_color = vec4(1.0);
+
+void fragment() {
+	vec4 c = use_texture ? texture(albedo_tex, UV) : vec4(1.0);
+	c *= modulate * COLOR;
+	ALBEDO = c.rgb * c.a;
+	ALPHA = 1.0;
+}
+)";
+
+Ref<Shader> shader_for(bool additive) {
+	static Ref<Shader> s_mix;
+	static Ref<Shader> s_add;
+	Ref<Shader> &slot = additive ? s_add : s_mix;
+	if (slot.is_null()) {
+		slot.instantiate();
+		slot->set_code(additive ? SRC_ADD : SRC_MIX);
+	}
+	return slot;
+}
+
+} // namespace
+
+Ref<ShaderMaterial> make_material(const MaterialDesc &d) {
+	Ref<ShaderMaterial> m;
+	m.instantiate();
+
+	const bool additive = (d.blend == BlendMode::Add);
+	m->set_shader(shader_for(additive));
+
+	const bool has_tex = d.albedo.is_valid();
+	m->set_shader_parameter("use_texture", has_tex);
+	if (has_tex) {
+		m->set_shader_parameter("albedo_tex", d.albedo);
+	}
+	m->set_shader_parameter("modulate", has_tex ? Color(1, 1, 1, 1) : Color(0.8, 0.8, 0.82, 1));
+
+	if (!additive) {
+		m->set_shader_parameter("alpha_scissor", d.alpha_scissor);
+		int mode = 0;
+		if (d.blend == BlendMode::Alpha) {
+			mode = 1;
+		} else if (d.blend == BlendMode::AlphaTest) {
+			mode = 2;
+		}
+		m->set_shader_parameter("mode", mode);
+	}
+	if (d.blend == BlendMode::Alpha) {
+		m->set_render_priority(1);
+	} else if (additive) {
+		m->set_render_priority(2);
+	}
+	return m;
+}
+
+} // namespace mtgodot

extension/src/m2_material.h

@@ -0,0 +1,35 @@
+#pragma once
+// m2_material — Metin2-style forward material as a Godot ShaderMaterial.
+//
+// M2.5 infrastructure. The gr2 fixed-function texture-stage / blend data is not
+// yet exposed by libgr2's POD API (see docs/GODOT-POC-PLAN.md §M2.5 gap list),
+// so callers pick the blend mode heuristically for now. The shader itself
+// already covers the common Metin2 cases: modulate(tex, vertex_color) + light,
+// alpha-test, alpha-blend, additive.
+
+#include <godot_cpp/classes/ref.hpp>
+
+namespace godot {
+class ShaderMaterial;
+class Texture2D;
+} // namespace godot
+
+namespace mtgodot {
+
+enum class BlendMode {
+	Opaque, // blend_mix, ALPHA=1, no discard
+	Alpha, // blend_mix, sorted, uses texture alpha
+	AlphaTest, // blend_mix, discard below alpha_scissor (cutout)
+	Add, // blend_add (glow / effects)
+};
+
+struct MaterialDesc {
+	godot::Ref<godot::Texture2D> albedo; // null -> flat white
+	BlendMode blend = BlendMode::Opaque;
+	float alpha_scissor = 0.5f;
+	bool two_sided = true; // winding not yet verified per-model
+};
+
+godot::Ref<godot::ShaderMaterial> make_material(const MaterialDesc &d);
+
+} // namespace mtgodot

extension/src/metin2_model.cpp

@@ -2,13 +2,16 @@
 
 #include "dxt.h"
 #include "gr2_bridge.h"
+#include "m2_material.h"
 
 #include <godot_cpp/classes/array_mesh.hpp>
 #include <godot_cpp/classes/base_material3d.hpp>
+#include <godot_cpp/classes/dir_access.hpp>
 #include <godot_cpp/classes/file_access.hpp>
 #include <godot_cpp/classes/image.hpp>
 #include <godot_cpp/classes/image_texture.hpp>
 #include <godot_cpp/classes/mesh_instance3d.hpp>
+#include <godot_cpp/classes/shader_material.hpp>
 #include <godot_cpp/classes/skeleton3d.hpp>
 #include <godot_cpp/classes/skin.hpp>
 #include <godot_cpp/classes/standard_material3d.hpp>
@@ -38,6 +41,9 @@ void Metin2Model::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_flip_z"), &Metin2Model::get_flip_z);
 	ClassDB::bind_method(D_METHOD("set_flip_winding", "v"), &Metin2Model::set_flip_winding);
 	ClassDB::bind_method(D_METHOD("get_flip_winding"), &Metin2Model::get_flip_winding);
+	ClassDB::bind_method(D_METHOD("set_material_mode", "m"), &Metin2Model::set_material_mode);
+	ClassDB::bind_method(D_METHOD("get_material_mode"), &Metin2Model::get_material_mode);
+	ClassDB::bind_method(D_METHOD("set_surface_texture", "surface", "path"), &Metin2Model::set_surface_texture);
 	ClassDB::bind_method(D_METHOD("reload"), &Metin2Model::reload);
 	ClassDB::bind_method(D_METHOD("get_info"), &Metin2Model::get_info);
 	ClassDB::bind_method(D_METHOD("probe_gr2", "path"), &Metin2Model::probe_gr2);
@@ -50,6 +56,28 @@ void Metin2Model::_bind_methods() {
 			"set_unit_scale", "get_unit_scale");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "flip_z"), "set_flip_z", "get_flip_z");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "flip_winding"), "set_flip_winding", "get_flip_winding");
+	ADD_PROPERTY(PropertyInfo(Variant::STRING, "material_mode", PROPERTY_HINT_ENUM, "metin2,standard"),
+			"set_material_mode", "get_material_mode");
+}
+
+void Metin2Model::set_material_mode(const String &m) {
+	material_mode = m;
+	if (is_inside_tree()) {
+		reload();
+	}
+}
+
+void Metin2Model::set_surface_texture(int surface, const String &path) {
+	if (surface < 0) {
+		return;
+	}
+	while (surface_tex_override.size() <= surface) {
+		surface_tex_override.push_back(String());
+	}
+	surface_tex_override[surface] = path;
+	if (is_inside_tree()) {
+		_apply_materials();
+	}
 }
 
 void Metin2Model::set_gr2_path(const String &p) {
@@ -173,58 +201,165 @@ String Metin2Model::_guess_texture_dir() const {
 	return gr2_path.get_base_dir();
 }
 
+Ref<godot::ImageTexture> Metin2Model::_load_dds(const String &path) {
+	Ref<ImageTexture> t;
+	if (tex_cache.has(path)) {
+		return tex_cache[path];
+	}
+	if (FileAccess::file_exists(path)) {
+		mtgodot::Image dds = mtgodot::load_dds_path(path.utf8().get_data());
+		if (dds.ok()) {
+			PackedByteArray bytes;
+			bytes.resize((int)dds.rgba.size());
+			memcpy(bytes.ptrw(), dds.rgba.data(), dds.rgba.size());
+			Ref<godot::Image> img = godot::Image::create_from_data(
+					dds.w, dds.h, false, godot::Image::FORMAT_RGBA8, bytes);
+			if (img.is_valid()) {
+				img->generate_mipmaps();
+				t = ImageTexture::create_from_image(img);
+			}
+		}
+	}
+	tex_cache[path] = t;
+	return t;
+}
+
+// Best-effort texture pick for a surface. libgr2's POD API gives no material or
+// texture names yet (see GODOT-POC-PLAN.md §M2.5 gap list), so this is filename
+// convention + a case-insensitive directory scan.
+Ref<godot::ImageTexture> Metin2Model::_resolve_texture(const String &dir, const String &stem,
+		const String &surface_name, const PackedStringArray &dds_files) {
+	String sn = surface_name.to_lower();
+
+	auto scan = [&](const String &needle) -> Ref<ImageTexture> {
+		for (int i = 0; i < dds_files.size(); ++i) {
+			if (dds_files[i].to_lower().find(needle) != -1) {
+				Ref<ImageTexture> t = _load_dds(dir.path_join(dds_files[i]));
+				if (t.is_valid()) {
+					return t;
+				}
+			}
+		}
+		return Ref<ImageTexture>();
+	};
+
+	// 1. surface-name keyword slots
+	if (sn.find("face") != -1) {
+		Ref<ImageTexture> t = _load_dds(dir.path_join(stem + String("_face.dds")));
+		if (t.is_null()) {
+			t = scan("face");
+		}
+		if (t.is_valid()) {
+			return t;
+		}
+	}
+	if (sn.find("hair") != -1) {
+		Ref<ImageTexture> t = _load_dds(dir.path_join(stem + String("_hair.dds")));
+		if (t.is_null()) {
+			t = scan("hair");
+		}
+		if (t.is_valid()) {
+			return t;
+		}
+	}
+	// 2. surface name used verbatim as a texture basename
+	if (!sn.is_empty()) {
+		Ref<ImageTexture> t = _load_dds(dir.path_join(surface_name + String(".dds")));
+		if (t.is_valid()) {
+			return t;
+		}
+	}
+	// 3. exact stem
+	Ref<ImageTexture> t = _load_dds(dir.path_join(stem + String(".dds")));
+	if (t.is_valid()) {
+		return t;
+	}
+	// 4. any dds whose name contains the stem, then any non-face/hair dds
+	t = scan(stem);
+	if (t.is_valid()) {
+		return t;
+	}
+	for (int i = 0; i < dds_files.size(); ++i) {
+		String f = dds_files[i].to_lower();
+		if (f.find("face") == -1 && f.find("hair") == -1 && f.find("_lod") == -1) {
+			Ref<ImageTexture> any = _load_dds(dir.path_join(dds_files[i]));
+			if (any.is_valid()) {
+				return any;
+			}
+		}
+	}
+	return Ref<ImageTexture>();
+}
+
+static mtgodot::BlendMode guess_blend(const String &surface_name) {
+	String sn = surface_name.to_lower();
+	if (sn.find("effect") != -1 || sn.find("glow") != -1 || sn.find("aura") != -1) {
+		return mtgodot::BlendMode::Add;
+	}
+	if (sn.find("hair") != -1) {
+		return mtgodot::BlendMode::AlphaTest; // Metin2 hair = alpha-test cutout
+	}
+	if (sn.find("cloak") != -1 || sn.find("cape") != -1 ||
+			sn.find("skirt") != -1 || sn.find("ribbon") != -1) {
+		return mtgodot::BlendMode::Alpha;
+	}
+	return mtgodot::BlendMode::Opaque;
+}
+
 void Metin2Model::_apply_materials() {
 	if (!mi || !file || !*file) {
 		return;
 	}
-	const gr2::FileInfo &fi = (*file)->file_info();
 	const String dir = _guess_texture_dir();
 	const String stem = gr2_path.get_file().get_basename();
 
-	// Cache: texture path -> ImageTexture.
-	auto load_tex = [&](const String &path) -> Ref<ImageTexture> {
-		Ref<ImageTexture> t;
-		if (!FileAccess::file_exists(path)) {
-			return t;
+	PackedStringArray dds_files;
+	{
+		Ref<DirAccess> da = DirAccess::open(dir);
+		if (da.is_valid()) {
+			da->list_dir_begin();
+			for (String f = da->get_next(); !f.is_empty(); f = da->get_next()) {
+				if (!da->current_is_dir() && f.to_lower().ends_with(".dds")) {
+					dds_files.push_back(f);
+				}
+			}
+			da->list_dir_end();
 		}
-		mtgodot::Image dds = mtgodot::load_dds_path(path.utf8().get_data());
-		if (!dds.ok()) {
-			return t;
-		}
-		PackedByteArray bytes;
-		bytes.resize((int)dds.rgba.size());
-		memcpy(bytes.ptrw(), dds.rgba.data(), dds.rgba.size());
-		Ref<godot::Image> img = godot::Image::create_from_data(
-				dds.w, dds.h, false, godot::Image::FORMAT_RGBA8, bytes);
-		if (img.is_null()) {
-			return t;
-		}
-		img->generate_mipmaps();
-		t = ImageTexture::create_from_image(img);
-		return t;
-	};
-
-	Ref<ImageTexture> tex_main = load_tex(dir.path_join(stem + String(".dds")));
-	Ref<ImageTexture> tex_face = load_tex(dir.path_join(stem + String("_face.dds")));
-	if (tex_face.is_null()) {
-		tex_face = load_tex(dir.path_join(String("warrior_face.dds")));
 	}
 
 	Ref<ArrayMesh> mesh = mi->get_mesh();
+	int textured = 0;
 	for (int s = 0; s < mesh->get_surface_count(); ++s) {
-		String sname = mesh->surface_get_name(s).to_lower();
-		Ref<ImageTexture> tex = (sname.find("face") != -1 && tex_face.is_valid()) ? tex_face : tex_main;
-
-		Ref<StandardMaterial3D> mat;
-		mat.instantiate();
-		mat->set_cull_mode(BaseMaterial3D::CULL_DISABLED); // M1: winding unverified
-		if (tex.is_valid()) {
-			mat->set_texture(BaseMaterial3D::TEXTURE_ALBEDO, tex);
+		const String sname = mesh->surface_get_name(s);
+		Ref<ImageTexture> tex;
+		if (s < surface_tex_override.size() && !String(surface_tex_override[s]).is_empty()) {
+			tex = _load_dds(surface_tex_override[s]);
 		} else {
-			mat->set_albedo(Color(0.8, 0.8, 0.82));
+			tex = _resolve_texture(dir, stem, sname, dds_files);
+		}
+		if (tex.is_valid()) {
+			++textured;
+		}
+
+		if (material_mode == String("standard")) {
+			Ref<StandardMaterial3D> mat;
+			mat.instantiate();
+			mat->set_cull_mode(BaseMaterial3D::CULL_DISABLED);
+			if (tex.is_valid()) {
+				mat->set_texture(BaseMaterial3D::TEXTURE_ALBEDO, tex);
+			} else {
+				mat->set_albedo(Color(0.8, 0.8, 0.82));
+			}
+			mi->set_surface_override_material(s, mat);
+		} else {
+			mtgodot::MaterialDesc md;
+			md.albedo = tex;
+			md.blend = guess_blend(sname);
+			mi->set_surface_override_material(s, mtgodot::make_material(md));
 		}
-		mi->set_surface_override_material(s, mat);
 	}
+	UtilityFunctions::print(vformat("[Metin2Model] materials: %d/%d surfaces textured (dir=%s, %d dds)",
+			textured, mesh->get_surface_count(), dir, (int)dds_files.size()));
 }
 
 const gr2::Skeleton *Metin2Model::gr2_skeleton() const {

extension/src/metin2_model.h

@@ -1,6 +1,10 @@
 #pragma once
 
+#include <godot_cpp/classes/image_texture.hpp>
 #include <godot_cpp/classes/node3d.hpp>
+#include <godot_cpp/classes/ref.hpp>
+#include <godot_cpp/templates/hash_map.hpp>
+#include <godot_cpp/variant/packed_string_array.hpp>
 #include <godot_cpp/variant/string.hpp>
 
 #include <gr2/gr2.h>
@@ -11,6 +15,7 @@
 namespace godot {
 class Skeleton3D;
 class MeshInstance3D;
+class ImageTexture;
 } // namespace godot
 
 namespace mtgodot {
@@ -46,6 +51,12 @@ public:
 	void set_flip_winding(bool v);
 	bool get_flip_winding() const { return flip_winding; }
 
+	void set_material_mode(const godot::String &m);
+	godot::String get_material_mode() const { return material_mode; }
+
+	// Explicit per-surface texture path override (index -> absolute .dds path).
+	void set_surface_texture(int surface, const godot::String &path);
+
 	// Rebuild the subtree from the current properties.
 	void reload();
 
@@ -69,14 +80,22 @@ private:
 	bool flip_z = false;
 	bool flip_winding = false;
 
+	godot::String material_mode = "metin2"; // "metin2" (ShaderMaterial) | "standard"
+	godot::PackedStringArray surface_tex_override;
+
 	std::shared_ptr<std::optional<gr2::File>> file; // shared_ptr so accessor stays valid
 	godot::Skeleton3D *skel = nullptr;
 	godot::MeshInstance3D *mi = nullptr;
 	godot::String last_info;
+	godot::HashMap<godot::String, godot::Ref<godot::ImageTexture>> tex_cache;
 
 	void _clear_children();
 	void _apply_materials();
 	godot::String _guess_texture_dir() const;
+	godot::Ref<godot::ImageTexture> _load_dds(const godot::String &path);
+	godot::Ref<godot::ImageTexture> _resolve_texture(const godot::String &dir,
+			const godot::String &stem, const godot::String &surface_name,
+			const godot::PackedStringArray &dds_files);
 };
 
 } // namespace mtgodot

project/main.gd

@@ -56,6 +56,15 @@ func _build_environment() -> void:
 	env.ambient_light_source = Environment.AMBIENT_SOURCE_SKY
 	env.ambient_light_energy = 0.6
 	env.tonemap_mode = Environment.TONE_MAPPER_FILMIC
+	# T2.5.4 — distance fog via the engine (not per-shader).
+	if OS.get_environment("MTGODOT_FOG") == "1":
+		env.fog_enabled = true
+		env.fog_mode = Environment.FOG_MODE_DEPTH
+		env.fog_light_color = Color(0.55, 0.55, 0.62)
+		env.fog_sun_scatter = 0.1
+		env.fog_density = 0.0
+		env.fog_depth_begin = 3.0
+		env.fog_depth_end = 12.0
 	we.environment = env
 	add_child(we)
 
@@ -121,13 +130,15 @@ func _load_content() -> void:
 
 
 func _frame_model() -> void:
-	# Use the model's converted world-space AABB to place the orbit target/dist.
+	# Place the orbit target/dist from the model's converted world-space AABB.
 	var mi := _model.get_node_or_null("MeshInstance3D") if _model else null
 	if mi and mi is VisualInstance3D:
-		var aabb: AABB = (mi as VisualInstance3D).get_aabb()
-		aabb = _model.transform * aabb
-		_target = aabb.get_center()
-		_dist = maxf(1.0, aabb.get_longest_axis_size() * 1.8)
+		var aabb: AABB = _model.transform * (mi as VisualInstance3D).get_aabb()
+		var h := maxf(aabb.size.y, 0.5)
+		_target = Vector3(aabb.get_center().x, aabb.position.y + h * 0.5, aabb.get_center().z)
+		_dist = h * 3.2
+		_pitch = 0.12
+		print("[mtgodot] frame: aabb=", aabb, " target=", _target, " dist=", _dist)
 	_update_camera()