make2/apps/blender/auto_qrcode.py

import bpy, sys, os, math, bmesh
# from PIL import Image, ImageDraw, ImageFont

def gen_qrcode(pid):
    fontHeightMax = 40
    fontsize = 1
    qr = qrcode.QRCode()
    qr.border = 2
    qr.add_data(pid)
    img = qr.make_image(fit=True)
    img = img.transform((250, 294), Image.Transform.EXTENT, (0, 0, 250, 294), fillcolor='white')

    cwd = os.path.dirname(os.path.abspath(__file__))
    fontfile = os.path.join(cwd, 'fonts', 'Helvetica.ttf')
    font = ImageFont.truetype(fontfile, fontsize)
    while font.getsize(pid)[1] <= fontHeightMax and font.getsize(pid)[0] <= 240:
        fontsize += 1
        font = ImageFont.truetype(fontfile, fontsize)
    fontsize -= 1

    captionx = (250 - font.getsize(pid)[0]) / 2
    draw = ImageDraw.Draw(img)
    draw.text((captionx, 242), pid, font=font)
    img.show()
    img.save(f'{workdir}{pid}.png')

def auto_rotate(pid):
    # 坐标复位
    obj = bpy.context.selected_objects[0]
    obj.rotation_euler[0] = 0
    bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
    bpy.ops.object.origin_set(type='ORIGIN_CENTER_OF_VOLUME', center='MEDIAN')
    bpy.ops.object.align(align_mode='OPT_1', relative_to='OPT_1', align_axis={'Y', 'Z'})
    bpy.ops.object.transform_apply(location=True, rotation=True, scale=True)
    # bpy.ops.export_scene.obj(filepath=f'{workdir}{pid}_align_yz.obj')

    # 躺平到打印机排版需要的坐标与角度
    obj.rotation_euler = (math.radians(90), math.radians(90), 0)
    bpy.ops.object.transform_apply(rotation=True)
    # bpy.ops.export_scene.obj(filepath=f'{workdir}{pid}_rotate_y90.obj')

    heights = {}
    min_height = 999999
    min_i = 0
    max_height = -999999
    max_i = 0
    
    bpy.ops.object.origin_set(type='ORIGIN_CENTER_OF_VOLUME', center='MEDIAN')
    bpy.ops.object.align(align_mode='OPT_1', relative_to='OPT_3', align_axis={'X', 'Y', 'Z'})

    # 步进精度2旋转X轴到180度，找到Y轴最低点和最高点，其中最低点为打印
    step = 2
    i = 0
    while i <= 180:
        obj.rotation_euler = (math.radians(step), 0, 0)
        bpy.ops.object.transform_apply(rotation=True)
        if obj.dimensions[1] < min_height:
            min_height = obj.dimensions[1]
            min_i = i
        if obj.dimensions[1] > max_height:
            max_height = obj.dimensions[1]
            max_i = i
        heights[i] = (obj.dimensions[0], obj.dimensions[1], obj.dimensions[2])
        print(i, heights[i])
        i += step

    obj.rotation_euler = (0, 0, 0)
    bpy.ops.object.transform_apply(rotation=True)
    obj.rotation_euler = (math.radians(min_i), 0, 0)
    bpy.ops.object.transform_apply(rotation=True)
    bpy.ops.export_scene.obj(filepath=f'{workdir}{pid}.obj')

    # obj.rotation_euler = (0, 0, 0)
    # bpy.ops.object.transform_apply(rotation=True)
    # obj.rotation_euler = (math.radians(max_i), 0, 0)
    # bpy.ops.object.transform_apply(rotation=True)
    # bpy.ops.export_scene.obj(filepath=f'{workdir}{pid}_maxz.obj')
    print(f'最小高度: {min_height} @ {heights[min_i]}min_i:{min_i}' , f'最大高度: {max_height} @ {heights[max_i]}max_i:{max_i}')

def cut_obj(pid):
    # 根据定位用一个面切割模型
    offset = 45.5
    radian = math.radians(90)
    bpy.ops.mesh.primitive_plane_add(size=200, enter_editmode=False, align='WORLD', location=(offset, 0, 0), rotation=(0, radian, 0), scale=(1, 1, 1))

    # 布尔切割，保留交集切面
    bpy.ops.object.modifier_add(type='BOOLEAN')
    bpy.context.object.modifiers["Boolean"].object = bpy.data.objects[pid]
    bpy.context.object.modifiers["Boolean"].operation = 'INTERSECT'
    bpy.context.object.modifiers["Boolean"].solver = 'FAST'
    bpy.ops.object.modifier_apply(modifier="Boolean")

    # 拆分切割面为多个多边形，然后遍历多边形，找到最大的面积
    bpy.ops.mesh.separate(type='LOOSE')

    max_area = 0
    max_obj = None
    for obj in bpy.data.objects:
        if obj.type == 'MESH' and obj.name.startswith('Plane'):
            area = obj.data.polygons[0].area
            if area > max_area:
                max_area = area
                max_obj = obj

    # 选中最大面积的多边形，然后计算中心点
    bpy.ops.object.select_all(action='DESELECT')
    max_obj.select_set(True)
    bpy.context.view_layer.objects.active = max_obj
    bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY')

    return max_obj

def main():
    filename = f'{workdir}{pid}.obj'
    print('正在处理:', filename)
    bpy.ops.import_scene.obj(filepath=filename)

    auto_rotate(pid)
    # gen_qrcode(pid)

    # 脚底切片，查找最大面积，计算中心点，计算坐标位置，怼入二维码贴片
    max_obj = cut_obj(pid)
    bpy.ops.import_scene.obj(filepath=f'{workdir}qr.obj')
    qr_obj = bpy.data.objects['Cube']
    shore_obj = bpy.data.objects['Cube.001']
    # bpy.data.objects['Cube'].origin_set(type='ORIGIN_GEOMETRY')
    # bpy.data.objects['Cube.001'].origin_set(type='ORIGIN_GEOMETRY')
    # bpy.data.objects['Cube.002'].origin_set(type='ORIGIN_GEOMETRY')
    # bpy.data.objects['Cube.003'].origin_set(type='ORIGIN_GEOMETRY')
    bpy.data.objects['Cube'] = (math.radians(90), math.radians(90), 0)
    bpy.data.objects['Cube.001'].rotation_euler = (math.radians(90), math.radians(90), 0)
    bpy.data.objects['Cube.002'].rotation_euler = (math.radians(90), math.radians(90), 0)
    bpy.data.objects['Cube.003'].rotation_euler = (math.radians(90), math.radians(90), 0)
    qr_obj.location = (max_obj.location[0] - qr_obj.dimensions[1] / 2 - shore_obj.dimensions[1]/2, max_obj.location[1], max_obj.location[2])
    shore_obj.location = (qr_obj.location[0] - shore_obj.dimensions[1]/2, max_obj.location[1], max_obj.location[2])
    bpy.data.objects['Cube.002'].location = (shore_obj.location[0], shore_obj.location[1]+0.2, shore_obj.location[2])
    bpy.data.objects['Cube.003'].location = (shore_obj.location[0], shore_obj.location[1]-0.2, shore_obj.location[2])

    bpy.ops.object.transform_apply(rotation=True, location=True, scale=True)


if __name__ == '__main__':
    workdir = '/home/water/Downloads/'
    if len(sys.argv) - (sys.argv.index("--") +1) < 1:
        print("Usage: blender -b -P auto_qrcode.py -- <pid>")
        sys.exit(1)
    pid = sys.argv[sys.argv.index("--") + 1]
    main()