6.6 KiB
2D Lights Properties
Creating a Light
Create a 2D Light GameObject by going to GameObject > Light > 2D and selecting one of the five available types:
- Freeform: You can edit the shape of this Light type with a spline editor.
- Sprite: You can select a Sprite to create this Light type.
- Parametric: You can use a n-sided polygon to create this his type of 2D Light.
- Point: You can control the inner and outer radius, direction and angle of this Light type.
- Global: This 2D Light affects all rendered Sprites on all targeted sorting layers.
The following are the common properties used by the different Light types.
| Property | Function |
|---|---|
| Light Type | Select the type of Light you want the selected Light to be. The available types are Freeform, Sprite, Parametric, Point, and Global. |
| Alpha Blend On Overlap | Select this option to blend the selected Light with Lights below it based on their alpha values. |
| Light Order *unavailable for Global Lights | Enter a value here to specify the rendering order of this Light relative to other Lights on the same sorting layer(s). Lights with lower values are rendered first, and negative values are valid. |
| Blend Style | Select the blend style used by this Light. Different blend styles can be customized in the 2D Renderer Asset. |
| Color | Use the color picker to set the color of the emitted light. |
| Intensity | Enter the desired brightness value of the Light. The default value is 1. |
| Use Normal Map | Select this to enable the Light to interact with a Sprite's normal map Textures. |
| Distance * available when Use Normal Map is checked | Enter the desired distance (in Unity units) between the Light and the lit Sprite. This does not Transform the position of the Light in the Scene. |
| Quality | Select either Accurate or Fast to adjust the accuracy of the lighting calculations used. |
| Volume Opacity | Use the slider to select the opacity of the volumetric lighting. The value scales from 0 (transparent) to 1 (opaque). |
| Target Sorting Layers | Select the sorting layers that this Light targets and affects. |
Alpha Blend on Overlap
This property controls the way in the selected Light interacts with other rendered Lights. You can toggle between the two modes by enabling or disabling this property. The effects of both modes are shown in the examples below:
 |
 |
|---|---|
| Alpha Blend on Overlap disabled (defaults to Additive blending) | Alpha Blend on Overlap enabled |
When Alpha Blend on Overlap disabled, the Light is blended with other Lights additively, where the pixel values of intersecting Lights are added together. This is the default Light blending behavior.
When Alpha Blend on Overlap is enabled, Lights are blended together based on their alpha values. This can be used to completely overwrite one Light with another where they intersect, but the render order of the Lights is also dependent on the Light Order of the different Lights.
Light Order
The Light Order value determines the position of the Light in the Render queue relative to other Lights that target the same sorting layer(s). Lower numbered Lights are rendered first, with higher numbered Lights rendered above those below. This especially affects the appearance of blended Lights when Alpha Blend on Overlap is enabled.
Intensity
Light intensity are available to all types of Lights. Color adjusts the lights color, while intensity allows this color to go above 1. This allows lights which use multiply to brighten a sprite beyond its original color.
Use Normal Map
All lights except for global lights can be toggled to use the normal maps in the sprites material. When enabled, Distance and Accuracy will be visible as new properties.
 |
 |
|---|---|
| __Use Normal Map: __Disabled | Use Normal Map: Enabled |
Distance
Distance controls the distance between the light and the surface of the Sprite, changing the resulting lighting effect. This distance does not affect intensity, or transform the position of the Light in the Scene. The following examples show the effects of changing the Distance values.
 |
 |
 |
|---|---|---|
| Distance: 0.5 | Distance: 2 | Distance: 8 |
Quality
Light quality allows the developer to choose between performance and accuracy. When choosing performance, artefacts may occur. Smaller lights and larger distance values will reduce the difference between fast and accurate.
Volume Opacity
Volumetric lighting is available to all Light types. Use the Volume Opacity slider to control the visibility of the volumetric light. At a value of zero, no Light volume is shown while at a value of one, the Light volume appears at full opacity.
Target Sorting Layers
Lights only light up the Sprites on their targeted sorting layers. Select the desired sorting layers from the drop-down menu for the selected Light. To add or remove sorting layers, refer to the Tag Manager - Sorting Layers for more information.