245 lines
9.1 KiB
Python
245 lines
9.1 KiB
Python
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import os
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import shutil
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def read_obj(file_path):
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"""读取OBJ文件，返回顶点、纹理坐标、法线、面的列表和MTL文件名"""
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vertices = [] # v
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tex_coords = [] # vt
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normals = [] # vn
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faces = [] # f
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face_materials = [] # 每个面对应的材质名称
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mtl_file = None # mtl文件名
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current_material = None # 当前使用的材质
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with open(file_path, 'r') as file:
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for line in file:
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if line.startswith('#') or not line.strip():
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continue
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parts = line.strip().split()
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if not parts:
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continue
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if parts[0] == 'mtllib': # MTL文件引用
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mtl_file = parts[1]
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elif parts[0] == 'usemtl': # 材质使用
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current_material = parts[1]
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elif parts[0] == 'v': # 顶点
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vertices.append([float(parts[1]), float(parts[2]), float(parts[3])])
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elif parts[0] == 'vt': # 纹理坐标
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tex_coords.append([float(parts[1]), float(parts[2])])
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elif parts[0] == 'vn': # 法线
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normals.append([float(parts[1]), float(parts[2]), float(parts[3])])
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elif parts[0] == 'f': # 面
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# 处理面的索引 (v/vt/vn)
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face_v = []
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face_vt = []
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face_vn = []
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for p in parts[1:]:
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indices = p.split('/')
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face_v.append(int(indices[0]))
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if len(indices) > 1 and indices[1]:
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face_vt.append(int(indices[1]))
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if len(indices) > 2:
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face_vn.append(int(indices[2]))
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faces.append((face_v, face_vt, face_vn))
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face_materials.append(current_material) # 记录这个面使用的材质
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return vertices, tex_coords, normals, faces, face_materials, mtl_file
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def read_mtl(mtl_path: str) -> tuple:
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"""读取MTL文件内容
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Returns:
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tuple: (文件内容列表, 材质名称列表)
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"""
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content = []
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material_names = []
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with open(mtl_path, 'r') as f:
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content = f.readlines()
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for line in content:
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if line.startswith('newmtl'):
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material_names.append(line.strip().split()[1])
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return content, material_names
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def update_mtl_content(content: list, model_id: int) -> tuple:
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"""更新MTL文件内容，修改材质名称和纹理文件路径
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Returns:
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tuple: (更新后的内容, 更新后的材质名称列表)
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"""
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updated_lines = []
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updated_material_names = []
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current_material = None
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for line in content:
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if line.startswith('newmtl'):
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# 为材质名称添加前缀
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parts = line.strip().split()
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material_name = parts[1]
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current_material = f"grid_{model_id}_{material_name}"
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updated_material_names.append(current_material)
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updated_lines.append(f"newmtl {current_material}\n")
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elif line.startswith('map_'):
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# 更新纹理文件路径
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parts = line.strip().split()
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texture_file = os.path.basename(parts[-1])
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parts[-1] = f"grid_{model_id}_{texture_file}"
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updated_lines.append(' '.join(parts) + '\n')
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else:
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updated_lines.append(line)
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return updated_lines, updated_material_names
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def merge_mtl_files(mtl1_path: str, mtl2_path: str, output_path: str) -> tuple:
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"""合并两个MTL文件
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Returns:
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tuple: (第一个模型的材质名称列表, 第二个模型的材质名称列表)
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"""
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# 读取两个MTL文件
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content1, materials1 = read_mtl(mtl1_path)
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content2, materials2 = read_mtl(mtl2_path)
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# 更新两个MTL的内容
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updated_content1, updated_materials1 = update_mtl_content(content1, 0)
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updated_content2, updated_materials2 = update_mtl_content(content2, 1)
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# 合并并写入新的MTL文件
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with open(output_path, 'w') as f:
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f.writelines(updated_content1)
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f.write('\n') # 添加分隔行
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f.writelines(updated_content2)
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return updated_materials1, updated_materials2
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def write_obj(file_path, vertices, tex_coords, normals, faces, face_materials, mtl_file=None):
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"""将顶点、纹理坐标、法线和面写入到OBJ文件"""
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with open(file_path, 'w') as file:
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# 写入MTL文件引用
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if mtl_file:
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file.write(f"mtllib {mtl_file}\n")
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# 写入顶点
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for v in vertices:
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file.write(f"v {v[0]} {v[1]} {v[2]}\n")
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# 写入纹理坐标
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for vt in tex_coords:
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file.write(f"vt {vt[0]} {vt[1]}\n")
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# 写入法线
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for vn in normals:
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file.write(f"vn {vn[0]} {vn[1]} {vn[2]}\n")
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# 写入面（按材质分组）
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current_material = None
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for face, material in zip(faces, face_materials):
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# 如果材质发生变化，写入新的usemtl
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if material != current_material:
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file.write(f"usemtl {material}\n")
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current_material = material
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face_str = "f"
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for j in range(len(face[0])):
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face_str += " "
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face_str += str(face[0][j])
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if face[1]:
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face_str += f"/{face[1][j]}"
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else:
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face_str += "/"
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if face[2]:
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face_str += f"/{face[2][j]}"
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else:
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face_str += "/"
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file.write(face_str + "\n")
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def translate_vertices(vertices, translation):
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"""平移顶点"""
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return [[v[0] + translation[0], v[1] + translation[1], v[2] + translation[2]] for v in vertices]
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def copy_mtl_and_textures(src_dir: str, dst_dir: str, model_id: int):
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"""复制MTL文件和相关的纹理文件，并重命名避免冲突
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Args:
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src_dir: 源目录（包含MTL和纹理文件）
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dst_dir: 目标目录
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model_id: 模型ID，用于重命名
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"""
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# 复制并重命名纹理文件
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for file in os.listdir(src_dir):
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if file.lower().endswith('.png'):
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src_file = os.path.join(src_dir, file)
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new_name = f"grid_{model_id}_{file}"
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dst_file = os.path.join(dst_dir, new_name)
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shutil.copy2(src_file, dst_file)
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print(f"复制纹理文件: {file} -> {new_name}")
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def merge_objs(obj1_path, obj2_path, output_path):
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"""合并两个OBJ文件"""
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print(f"开始合并OBJ模型:\n输入1: {obj1_path}\n输入2: {obj2_path}")
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# 读取两个obj文件
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vertices1, tex_coords1, normals1, faces1, face_materials1, mtl1 = read_obj(obj1_path)
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vertices2, tex_coords2, normals2, faces2, face_materials2, mtl2 = read_obj(obj2_path)
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# 固定平移量(0, 1000, 0)
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translation = (0, 1000, 0)
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# 平移第二个模型的顶点
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vertices2_translated = translate_vertices(vertices2, translation)
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# 计算偏移量
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v_offset = len(vertices1)
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vt_offset = len(tex_coords1)
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vn_offset = len(normals1)
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# 合并顶点、纹理坐标和法线
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all_vertices = vertices1 + vertices2_translated
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all_tex_coords = tex_coords1 + tex_coords2
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all_normals = normals1 + normals2
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# 调整第二个模型的面索引和材质名称
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all_faces = faces1.copy()
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all_face_materials = face_materials1.copy()
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for face, material in zip(faces2, face_materials2):
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new_face_v = [f + v_offset for f in face[0]]
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new_face_vt = [f + vt_offset for f in face[1]] if face[1] else []
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new_face_vn = [f + vn_offset for f in face[2]] if face[2] else []
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all_faces.append((new_face_v, new_face_vt, new_face_vn))
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# 为第二个模型的材质名称添加前缀
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all_face_materials.append(f"grid_1_{material}")
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# 为第一个模型的材质添加前缀
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all_face_materials[:len(faces1)] = [f"grid_0_{mat}" for mat in face_materials1]
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# 创建输出子目录
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output_dir = os.path.dirname(output_path)
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os.makedirs(output_dir, exist_ok=True)
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# 复制并重命名两个模型的纹理文件
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src_dir1 = os.path.dirname(obj1_path)
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src_dir2 = os.path.dirname(obj2_path)
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copy_mtl_and_textures(src_dir1, output_dir, 0)
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copy_mtl_and_textures(src_dir2, output_dir, 1)
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# 合并MTL文件并获取材质名称
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src_mtl1 = os.path.join(src_dir1, mtl1)
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src_mtl2 = os.path.join(src_dir2, mtl2)
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dst_mtl = os.path.join(output_dir, "merged_model.mtl")
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merge_mtl_files(src_mtl1, src_mtl2, dst_mtl)
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# 写入合并后的obj文件
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write_obj(output_path, all_vertices, all_tex_coords, all_normals,
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all_faces, all_face_materials, "merged_model.mtl")
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print(f"模型合并成功，已保存至: {output_path}")
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if __name__ == "__main__":
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# 测试参数
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obj1_path = r"G:\ODM_output\1009\grid_0_0\project\odm_texturing\odm_textured_model_geo.obj"
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obj2_path = r"G:\ODM_output\1009\grid_0_1\project\odm_texturing\odm_textured_model_geo.obj"
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output_dir = r"G:\ODM_output\1009\merge_test"
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# 创建输出目录
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os.makedirs(output_dir, exist_ok=True)
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output_path = os.path.join(output_dir, "merged_test.obj")
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# 执行合并
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merge_objs(obj1_path, obj2_path, output_path)
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