Physical Light 物理光

 

Introduction

引言

The Redshift Physical Light is an all-purpose light which can be used to model point, spot and directional lights as well as area lights of various shapes.

红移物理光是一种通用的光，可以用来模拟点，点和方向灯，以及各种形状的区域灯。

 

 

 

General

将军

On

开始

Turns the light on or off.

开灯或关灯。

Light Type

轻便型

Specifies the light type.

指定光的类型。

• Area 面积: A light which has a real physical size and shape. : 有实际物理尺寸和形状的光
• Point 重点: A point light. Simulates a 'bare bulb' light which emits light in all directions from an infinitesimally small point in space. : 点灯。模拟空间中一个无限小的点向各个方向发射光的“裸灯泡”
• Spot 斑点: A spot light. Emits light in a cone-shape. : 聚光灯。发出锥形光线
• Directional 定向的: An 'infinite' or 'distant' light. Simulates a light source which is infinitely far away from the scene. A directional light has no position, only a direction. All rays emitted by a directional light are parallel and have no decay. : 无限或遥远的光。模拟离场景无限远的光源。定向灯没有位置，只有方向。定向光发出的所有射线都是平行的，没有衰变

 

Intensity

强度

Mode

模式

Specifies the color mode.

指定颜色模式。

• Color 颜色: Light color is specified by the : 浅色由Color 颜色 parameter below. 下面的参数
• Temperature 温度: Light color is specified by the : 浅色由Temperature 温度 parameter below. 下面的参数

Color

颜色

Specifies the color of the light using (R,G,B) values.

使用(r，g，b)值指定光线的颜色。

Temperature

温度

Specifies the color of the light using a color temperature value (in Kelvin). Redshift supports color temperatures between 1667K and 25000K. Lower values are 'warmer' or more red, while higher values are 'cooler' or more blue.

使用颜色温度值(开尔文)指定光的颜色。红移支持颜色温度在1667K 和25000K 之间。较低的数值是“较暖”或更多的红色，而较高的数值是“较冷”或更多的蓝色。

Unit Type

单位类别

Specifies the physical units to use for the light intensity.

指定用于光强度的物理单位。

• Image: 图片: use non-physical units. 使用非物理单位
• Luminous Power (lm): 发光功率(lm) : use lumens. The light intensity will not be affected by the area of the light. 使用流明。光线强度不会受到光线面积的影响
• Luminance (cd/m^2): 亮度(cd/m ^ 2) : use candela/m^2. 用 candela/m ^ 2
• Radiant Power (W): 辐射功率(w) : use Watts. The light intensity will not be affected by the area of the light. 使用美国瓦茨。光线强度不会受到光线面积的影响
• Radiance (W/sr/m^2): 辐射率(w/sr/m ^ 2) : use Watts/steradian/m^2. 用 Watts/steradian/m ^ 2

Luminous Efficacy (lm/w)

发光效率(lm/w)

Specifies how many lumens are emitted per Watt. Only relevant when using Radiant Power or Radiance unit types.

指定每瓦发出多少流明。只有在使用辐射功率或辐射单位类型时才有用。

Intensity Multiplier

强度倍增器

Specifies the intensity of the light or the number of physical units (see above).

指定光的强度或物理单位的数量(见上文)。

Exposure

曝光

Specifies an f-stop value that allows you to intuitively increase/decrease the light's intensity when matching to a plate, or rendering large/tiny scenes without using hugh/miniscule Intensity Multiplier numbers. A value of 0.0 means the intensity does not change.

指定一个 f-stop 值，该值允许您在匹配底片时直观地增加/减少光线的强度，或者在渲染大/小场景时不使用休/微小的强度倍数。值为0.0意味着强度不变。

For example, an Exposure value of 1.0 means the light doubles in intensity and a value by 2.0 means the light quadruples in intensity, etc.

例如，曝光值为1.0意味着光强度翻倍，2.0意味着光强度翻四倍，等等。

Ray Contribution

See Common Redshift Light Parameters.

参见常见红移光参数。

Decay 腐烂

Type 类型

Specifies the decay of the light;

指定光的衰减;

• Inverse-square 逆平方
• None 没有
• Linear 线性

Decay Type in Detail

衰变类型的细节

In the example below the light source in the bottom right has its decay type switched between the 3 different types. Inverse square is physically accurate based on the light's size and intensity. Linear demonstrates how you can specify the start and stop falloff to control exactly where the light starts to be visible and then decays to nothing. None turns off decay entirely.

在下面的例子中，右下角的光源的衰变类型在三种不同类型之间进行了切换。反平方是物理上精确的基础上的光的大小和强度。线性演示了如何指定开始和停止衰减来精确控制光线开始可见然后衰减为零的位置。没有一种能完全阻止衰变。

Falloff Start 下降开始

Specifies the distance from the light at which linear fall-off occurs.

指定线性衰减发生时与光线的距离。

Falloff Stop 下降停止

Specifies the distance from the light at which linear fall-off ends.

指定线性下降结束时与光线的距离。

Area 面积

Shape 形状

Specifies the physical shape of the area light;

指定区域灯的物理形状;

• Rectangle 长方形
• Disc 圆盘
• Sphere 球体
• Cylinder 汽缸
• Mesh  网格

Mesh 网格

See Mesh Lights for info on how to use them.

如何使用网眼灯的信息。

Visible 可见的

Controls the primary visibility of the light.

控制光的主要可见性。

Below shows a rectangular light with visibility enabled on the left and disabled on the right. Note that there is no difference in the light distribution here. However lights with visibility enabled will cast shadows from other lights in the scene.

下面显示的是一个矩形灯，左边可见，右边禁用。注意，这里的光分布没有什么不同。然而，能见度开启的灯光会从场景中的其他灯光投射阴影。

Bi-directional 双向的

Enables bi-directional lighting such that light is emitted on both sides of the shape. Only valid for Rectangle and Disc area shapes.

使双向照明，使光线在形状的两侧发射。仅对“矩形”和“圆盘”区域形状有效。

Below shows a rectangular light with Bi-directional disabled on the left and enabled on the right. Note how the light comes out of both sides with bi-directional enabled.

下面显示了一个矩形的光与双向禁用的左侧和启用的权利。注意光线是如何通过双向激活从两边射出的。

Normalize Intensity

正常化强度

Removes the area of the light from the lighting calculation. Enabling this option prevents the light intensity from changing when the size of the light changes.

从照明计算中移除光的面积。启用此选项可防止当光线大小改变时光线强度发生变化。

Spread

传播

Enables directionality control for Rectangle and Disc area lights, similar to a barn door effect or spot light. The lower the Spread, the more the light is concentrated in the direction of the light normal. A Spread value of 1.0 is the default, physically correct lighting behavior, while a value of 0.0 makes the light almost a directional light.

可以对矩形和圆盘区域的灯进行方向控制，类似于仓门效果或聚光灯。扩散越小，光线越集中在光线法向方向上。传播值1.0是默认的，物理上正确的照明行为，而0.0的值使光线几乎是方向性的。

Samples

样本

Specifies the number of ray samples to use for the area light. More samples will produce smoother lighting and shadows. Generally, the larger and more intense an area light is, the more samples it needs to produce noise-free results.

指定用于区域照明的射线样本数。更多的样品将产生更平滑的光照和阴影。一般来说，面积越大，光线越强，产生无噪声结果所需的样品就越多。

Spot

斑点

Cone Angle 锥角

Specifies the angle of the spot light cone.

指定聚光灯锥的角度。

Below shows three physical lights set to 'spot' with cone angle values smallest on the left to largest on the right:

下面显示了三个物理光源被设置为“点”，圆锥角值从左到右从小到大:

Fall-Off Angle 落差角

Specifies the angle over which light falls off at the edge of the spot light cone. Smaller values will produce a sharper edge.

指定光线落在聚光灯锥边缘的角度。数值越小，边缘越锋利。

Below shows three physical lights set to 'spot' with falloff angle values smallest on the left to largest on the right:

下面显示了三个物理灯光设置为点与衰减角值最小的左侧最大的权利:

Shadow

阴影

See Common Redshift Light Parameters.

参见常见红移光参数。

Volume

音量

See Common Redshift Light Parameters.

参见常见红移光参数。

Photon

光子

See Common Redshift Light Parameters.

参见常见红移光参数。