Light Settings

参考

面板:Properties ‣ Light and Shader Editor ‣ Sidebar ‣ Settings

Next to lighting from the background and any object with an emission shader, lights are another way to add light into the scene. The difference is that they are not directly visible in the rendered image, and can be more easily managed as objects of their own type.

Common

Light settings for all renderers.

Cycles

采样
For the branch path tracing integrator, this specifies the number of direct light samples per AA sample. Point lights might need only one sample, while area lights typically need more.
最多反弹次数
Maximum number of times light from the light is allowed to bounce. Limited by scene-wide bounce settings.
投射阴影
By disabling this option, light from lights will not be blocked by objects in between. This can speed up rendering by not having to trace rays to the light source.
多重重要性采样
By default lights use only direct light sampling. For area lights and sharp glossy reflections, however, this can be noisy, and enabling this option will enable indirect light sampling to be used in addition to reduce noise.

日光入口

Area lights can also function as light portals to help sample the environment light, and significantly reduce noise in interior scenes. Note that rendering with portals is usually slower, but as it converges more quickly, less samples are required.

Light portals work by enabling the Portal option, and placing areas lights in windows, door openings, and any place where light will enter the interior.

在户外场景中,大多数光线不会反弹太多,只能飞向天空,因此,光线入口无助于户外场景。

../../_images/render_cycles_lamps_portals2.jpg
../../_images/render_cycles_lamps_portals.jpg

Jay Hardy的白色房间模型。