灯光参数的意义 

On - should be obvious

Double-sided - this has effect only on planar maps. It will make them cast light on both sides. 

 

两面都发光。

Transparent - when this is on, the light will not be visible, but will cast light. This can be very useful for interior scenes - you can put transparent lights at the windows, instead of counting just on skylight. 

 

不选中时，灯是可见的。选中时，灯不可见，可以用来模拟天光，窗口的进光

Ingore light normals - by default VRay takes in account the angle between a shadow ray and the light. This produces a noisy image, even in areas that are completely lit (not in shadow). Turning this option on will make VRay ignore this angle and will make the image less noisy (but not physically correct). 

 

默认状态下，vray...（此处不明），这将产生麻点，即使在完全不在阴影中的区域内。勾选中后vray将不考虑这种这种地方，麻点会少点，（但物理上是不正确的）

No decay - by default VRay lights become weaker as the distance * them increases - this is how lights behave in the real world. However, it may not be very convenient to work with. Turning this option on will cause VRay to ignore this distance. You will probably have to adjust the Multiplier if you change this option. Also, it seems that using it causes some artifacts which we will try to fix. 

 

不衰减

Store with irradiance map - this option allows you to store the diffuse illumination * a VRay light in the irradiance map. It may be useful in fly-through animations. 

 

与光照贴图一起保存，对游历动画很有用。

Type and Size I think are clear, with the exception of W size - currently it does nothing, since the two supported types need at most two dimensional parameters.

Subdivs - this controls the quality (graininess) of the shadows. Greater values will produce smoother shadows. The parameter determines the number of samples (per pixel) that VRay will make in order to calculate the shadows (actually, this parameter is the square of the number of samples). VRay may send less (but never more) shadow rays when possible without loss in visual quality. 

 

控制阴影的质量。大点会光滑一点。与采样值的平方成正比。

Low subdivs - this is used instead of Subdivs for irradiance map calculations and also when the level of a ray becomes greater than the degrade depth (see below). Each intersection of a ray with a surface increases its ray level by one. For example reflections typically increase the level of a ray by one, and refractions - by two, since the ray needs to pass through the front and the back surface of the refractive objects. 

 

Degrade depth - this is the ray level after which Low subdivs will be used instead of Subdivs. In the recent version of VRay, sampling is to a large extent handled automatically, so you can * this to a large value without performance loss.