build_obj_and_foot/libs/foot_mark_seam.py

import bpy
import bmesh


def active_object(obj):
    bpy.context.view_layer.objects.active = obj
    obj.select_set(True)


def get_obj_max_foot(workdir,filename,filename_tex):
    # 1.模型导入和初始化
    # 删除当前场景中的所有对象：
    # use_global=False表示只删除当前场景中的对象，而不会影响到其他场景中的对象；confirm=False表示删除时不需要确认。
    bpy.ops.object.delete(use_global=False, confirm=False)
    bpy.ops.import_scene.obj(filepath=filename)  # 导入指定路径的 OBJ 格式模型文件

    bpy.context.scene.unit_settings.scale_length = 0.001  # 将场景的长度单位缩放为0.001，相当于将长度单位从默认的米缩小为毫米
    bpy.context.scene.unit_settings.length_unit = 'CENTIMETERS'  # 将场景的长度单位设置为厘米
    bpy.context.scene.unit_settings.mass_unit = 'GRAMS'  # 将场景的质量单位设置为克

    obj = bpy.context.selected_objects[0]  # 获取了当前选中的对象列表，然后通过 [0] 取得列表中的第一个对象
    bpy.context.view_layer.objects.active = obj  # 将变量 obj 设置为当前活动对象
    obj.select_set(True)  # 将变量 obj 的选择状态设置为 True，表示选中该对象
    pid = obj.name  # 获取该对象的名字

    # 对选定的对象进行对齐操作
    bpy.ops.object.align(align_mode='OPT_1', relative_to='OPT_1', align_axis={'Z'})
    # 设置选中对象的原点，参数1：将原点设置为对象的质心，参数2：使用对象的几何中心作为参考
    bpy.ops.object.origin_set(type='ORIGIN_CENTER_OF_MASS', center='MEDIAN')
    # 将选中对象的位置坐标分别设置为 (0, 0)，即将对象移动到世界坐标系的原点位置
    obj.location[0] = 0
    obj.location[1] = 0
    bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)  # 将选中对象的位置、旋转和缩放应用到对象的数据中

    # 2.选择要复制的对象
    obj_duplicate = obj.copy()
    obj_duplicate.data = obj.data.copy()
    bpy.context.collection.objects.link(obj_duplicate)
    # obj_duplicate.location.x += 5.0
    bpy.ops.object.select_all(action='DESELECT')  # 取消选中全部对象

    # 3.处理复制的对象的脚底缝合边
    # 选中复制对象
    bpy.context.view_layer.objects.active = obj_duplicate
    obj_duplicate.select_set(True)

    selected_obj = bpy.context.active_object  # 获取当前选中的对象
    bpy.context.view_layer.objects.active = selected_obj  # 将对象转换到编辑模式

    # 切换到3D视图编辑模式
    bpy.context.area.type = 'VIEW_3D'
    bpy.ops.object.mode_set(mode='EDIT')
    bpy.ops.mesh.select_all(action='SELECT')  # 选择所有的边

    # 切换到UV编辑器
    bpy.context.area.type = 'IMAGE_EDITOR'
    pid_img = f"{pid}Tex1.jpg"
    bpy.ops.image.open(filepath=filename_tex, directory=workdir,
                       files=[{"name": pid_img, "name": pid_img}], relative_path=True,
                       show_multiview=False)
    bpy.context.area.ui_type = 'UV'
    bpy.ops.uv.select_all(action='SELECT')  # 选择所有UV贴图顶点
    # 标记所有沿孤岛的边为缝合边
    bpy.ops.uv.seams_from_islands()
    bpy.context.area.type = 'VIEW_3D'
    bpy.ops.object.mode_set(mode='OBJECT')

    # 获取世界坐标系下z轴接近0的顶点的索引
    z_zero_vertex_indices = []
    for i, vertex in enumerate(selected_obj.data.vertices):
        world_vertex = selected_obj.matrix_world @ vertex.co
        if abs(world_vertex.z) < 0.2:
            z_zero_vertex_indices.append(i)
    # 将对象转换回对象模式
    bpy.ops.object.mode_set(mode='OBJECT')
    # 创建一个新的顶点组，并将z_zero_vertices中的顶点添加到该顶点组中
    vg = selected_obj.vertex_groups.new(name="z_zero_vertices")
    for index in z_zero_vertex_indices:
        vg.add([index], 1.0, 'REPLACE')
    # 将选中的顶点设置为活动顶点
    bpy.ops.object.mode_set(mode='EDIT')
    bpy.ops.mesh.select_all(action='DESELECT')
    bpy.ops.object.vertex_group_select()  # 选中待处理的顶点
    bpy.ops.mesh.mark_seam(clear=True)  # 取消所选区域内的缝合边
    bpy.ops.mesh.region_to_loop()  # 选择选定面周围的边界边!!!
    bpy.ops.mesh.select_mode(type="EDGE")  # 转换为线模式
    bpy.ops.mesh.mark_seam(clear=False)  # 标记所选的线为缝合边

    # 选中脚底顶点组
    bpy.ops.uv.select_all(action='DESELECT')
    bpy.ops.object.vertex_group_set_active(group='z_zero_vertices')  # 设置活动顶点组
    bpy.ops.object.vertex_group_select()  # 选择分配给活动顶点组的所有顶点
    bpy.ops.uv.unwrap()

    # 处理贴图脚底部分孤岛，其他孤岛保持不变
    # (1)反选模型顶点，方便贴图固定不需要处理的区域
    bpy.ops.mesh.select_all(action='INVERT')
    bpy.context.area.type = 'IMAGE_EDITOR'  # 切换到贴图模式
    bpy.context.area.ui_type = 'UV'
    bpy.ops.uv.pin(clear=False)
    bpy.ops.object.vertex_group_set_active(group='z_zero_vertices')  # 设置活动顶点组
    bpy.ops.object.vertex_group_select()  # 选择分配给活动顶点组的所有顶点
    # (2)脚底部位UV展开，平均孤岛比例，重新排列孤岛
    bpy.ops.uv.select_all(action='SELECT')
    bpy.ops.uv.average_islands_scale()
    bpy.ops.uv.pack_islands(margin=0.001)

    bpy.context.area.type = 'VIEW_3D'
    bpy.ops.object.mode_set(mode='OBJECT')

    # 4. 烘焙模式，参数设置
    bpy.ops.object.select_all(action='DESELECT')  # 取消选中全部对象
    # # 选中原始对象
    bpy.context.view_layer.objects.active = obj
    obj.select_set(True)
    # 选中复制对象
    bpy.context.view_layer.objects.active = obj_duplicate
    obj_duplicate.select_set(True)
    bpy.context.scene.render.engine = 'CYCLES'
    bpy.context.scene.cycles.device = 'GPU'
    bpy.context.scene.cycles.preview_samples = 1
    bpy.context.scene.cycles.samples = 1
    bpy.context.scene.cycles.bake_type = 'DIFFUSE'
    bpy.context.scene.render.bake.use_pass_direct = False
    bpy.context.scene.render.bake.use_pass_indirect = False
    bpy.context.scene.render.bake.use_selected_to_active = True
    bpy.context.scene.render.bake.cage_extrusion = 0.01
    bpy.ops.object.bake(type='DIFFUSE')  # 开始 Bake

    # 5. 导出模型和贴图
    bpy.ops.object.select_all(action='DESELECT')  # 取消选中全部对象
    # 选中复制对象
    bpy.context.view_layer.objects.active = obj_duplicate
    obj_duplicate.select_set(True)
    bpy.ops.wm.obj_export(filepath=filename, export_selected_objects=True)
    bpy.context.area.type = 'IMAGE_EDITOR'  # 切换到
    bpy.ops.image.save_as(filepath=filename_tex)
    bpy.context.area.type = 'TEXT_EDITOR'  # 切换到文本编辑器


if __name__ == '__main__':
    workdir = 'E:\\117080\\print_model'
    #    filename = f'{workdir}\\117080_12cm_x1.obj'
    filename = f'{workdir}\\117080.obj'
    filename_tex = f'{workdir}\\117080Tex1.jpg'
    save_obj = f"{workdir}\\bake\\117080Tex1.obj"
    save_tex = f"{workdir}\\bake\\117080Tex1.jpg"

    get_obj_max_foot()