给手术床的上面添加浅绿色皮革材质，其余部分使用乳白色喷漆的亚光金属材质。轮子使用黑色橡胶材质。给出上述材质的着色代码。

以下是一个简单的Python脚本，用于在Blender中为手术床添加材质：

import bpy

# 获取手术床对象
bed_obj = bpy.data.objects["Cube"]

# 创建乳白色喷漆材质
white_paint = bpy.data.materials.new(name="White Paint")
white_paint.use_nodes = True
white_paint.node_tree.nodes.remove(white_paint.node_tree.nodes.get("Diffuse BSDF"))
white_paint.node_tree.nodes.remove(white_paint.node_tree.nodes.get("Material Output"))
white_paint_node = white_paint.node_tree.nodes.new(type="ShaderNodeBsdfPrincipled")
white_paint_node.inputs[0].default_value = (0.8, 0.8, 0.8, 1)
white_paint_node.inputs[12].default_value = 0.2
white_paint_output = white_paint.node_tree.nodes.new(type="ShaderNodeOutputMaterial")
white_paint.node_tree.links.new(white_paint_node.outputs[0], white_paint_output.inputs[0])

# 创建浅绿色皮革材质
green_leather = bpy.data.materials.new(name="Green Leather")
green_leather.use_nodes = True
green_leather.node_tree.nodes.remove(green_leather.node_tree.nodes.get("Diffuse BSDF"))
green_leather.node_tree.nodes.remove(green_leather.node_tree.nodes.get("Material Output"))
green_leather_node = green_leather.node_tree.nodes.new(type="ShaderNodeBsdfPrincipled")
green_leather_node.inputs[0].default_value = (0.4, 0.8, 0.6, 1)
green_leather_node.inputs[5].default_value = 0.4
green_leather_node.inputs[7].default_value = 0.6
green_leather_output = green_leather.node_tree.nodes.new(type="ShaderNodeOutputMaterial")
green_leather.node_tree.links.new(green_leather_node.outputs[0], green_leather_output.inputs[0])

# 创建黑色橡胶材质
black_rubber = bpy.data.materials.new(name="Black Rubber")
black_rubber.use_nodes = True
black_rubber.node_tree.nodes.remove(black_rubber.node_tree.nodes.get("Diffuse BSDF"))
black_rubber.node_tree.nodes.remove(black_rubber.node_tree.nodes.get("Material Output"))
black_rubber_node = black_rubber.node_tree.nodes.new(type="ShaderNodeBsdfPrincipled")
black_rubber_node.inputs[0].default_value = (0.05, 0.05, 0.05, 1)
black_rubber_node.inputs[4].default_value = 1
black_rubber_node.inputs[5].default_value = 1
black_rubber_output = black_rubber.node_tree.nodes.new(type="ShaderNodeOutputMaterial")
black_rubber.node_tree.links.new(black_rubber_node.outputs[0], black_rubber_output.inputs[0])

# 床主体使用乳白色喷漆材质
bed_obj.data.materials.append(white_paint)

# 轮子使用黑色橡胶材质
for wheel in bed_obj.children:
    if wheel.name.startswith("Cylinder"):
        wheel.data.materials.append(black_rubber)

# 床上的支架使用乳白色喷漆材质
for support in bed_obj.children:
    if support.name.startswith("Cylinder") and support.name != "Cylinder":
        support.data.materials.append(white_paint)

# 床上的顶部使用浅绿色皮革材质
top = bed_obj.data.polygons[4]
top.material_index = 1
bed_obj.data.materials.append(green_leather)

以上代码创建了三个材质：乳白色喷漆、浅绿色皮革和黑色橡胶。手术床主体使用了乳白色喷漆材质，轮子使用了黑色橡胶材质，床上的支架使用了乳白色喷漆材质，而床上的顶部使用了浅绿色皮革材质。您可以根据自己的需求调整每个材质的颜色和属性。