Blender 使用 Pov Ray 插件渲染“位置：<未知位置>”和“UnboundLocalError”

Question

我不确定这是最好的地方，但我来了...

我正在尝试使用 Blender 2.79b 的 Pov 射线插件渲染图像。当我这样做时，它只会向我展示一个丑陋的棋盘。

在闲逛之后，我点击了信息选项卡，它向我显示了这条小消息：

Traceback (most recent call last):
  File "C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons\render_povray\render.py", line 4147, in render
    self._export(scene, povPath, renderImagePath)
  File "C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons\render_povray\render.py", line 3837, in _export
    write_pov(self._temp_file_in, scene, info_callback)
  File "C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons\render_povray\render.py", line 3648, in write_pov
    shading.writeMaterial(using_uberpov, DEF_MAT_NAME, scene, tabWrite, safety, comments, uniqueName, materialNames, material)
  File "C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons\render_povray\shading.py", line 251, in writeMaterial
    if(t and t.use and validPath and
UnboundLocalError: local variable 'validPath' referenced before assignment

location: <unknown location>:-1

不幸的是，我并不真正了解 Python（或一般的编码），所以在我更好地理解它之前我不想接触任何东西。

Answer 1

打开文件C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons\render_povray\shading.py并替换行

if material:
    special_texture_found = False
    for t in material.texture_slots:
        if t and t.use and t.texture is not None:
            if (t.texture.type == 'IMAGE' and t.texture.image) or t.texture.type != 'IMAGE':
                validPath=True
        else:
            validPath=False
        if(t and t.use and validPath and
           (t.use_map_specular or t.use_map_raymir or t.use_map_normal or t.use_map_alpha)):
            special_texture_found = True
            continue  # Some texture found

    if special_texture_found or colored_specular_found:
        # Level=1 Means No specular nor Mirror reflection
        povHasnoSpecularMaps(Level=1)

        # Level=3 Means Maximum Spec and Mirror
        povHasnoSpecularMaps(Level=3)

使用来自 Blender 2.8 更新插件的以下代码。确保标识级别与原始文件中的相同。

if material:
    special_texture_found = False
    for t in material.texture_slots:
        if t and t.use and t.texture is not None:
            if (t.texture.type == 'IMAGE' and t.texture.image) or t.texture.type != 'IMAGE':
                #validPath
                if(t and t.use and
                   (t.use_map_specular or t.use_map_raymir or t.use_map_normal or t.use_map_alpha)):
                    special_texture_found = True
                    continue  # Some texture found

    if special_texture_found or colored_specular_found:
        # Level=1 Means No specular nor Mirror reflection
        povHasnoSpecularMaps(Level=1)

        # Level=3 Means Maximum Spec and Mirror
        povHasnoSpecularMaps(Level=3)

代码中的问题是 if-case if (t.texture.type == 'IMAGE' and t.texture.image) or t.texture.type != 'IMAGE': 没有设置 validPath 的 else 情况。如果发生这种情况，则 validPath 未初始化，这会导致您遇到错误。