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Showing content from https://docs.unity3d.com/Manual/sprite/placeholder/../../class-LightmapParameters.html below:

Manual: Lightmap Parameters Asset Inspector window reference

Lighting Settings Asset Inspector window reference

Debug Draw Modes for lighting reference

Lightmap Parameters Asset Inspector window referenceSwitch to Scripting Properties

When you click on a LightmapA pre-rendered texture that contains the effects of light sources on static objects in the scene. Lightmaps are overlaid on top of scene geometry to create the effect of lighting. More info See in Glossary Parameters Asset in the Project windowA window that shows the contents of your Assets folder (Project tab) More info See in Glossary, the InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info See in Glossary window displays the values defined in that Asset. The parameters and their descriptions are listed in the table below.

Realtime GI

These parameters configure Enlighten Realtime Global Illumination.

See render pipeline feature comparison for more information about support for EnlightenA lighting system by Geomerics used in Unity for Enlighten Realtime Global Illumination. More info See in Glossary Realtime Global IlluminationA group of techniques that model both direct and indirect lighting to provide realistic lighting results. See in Glossary across render pipelinesA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info See in Glossary.

Property Function Resolution This value scales the Realtime Resolution value in the Scene tab of the Lighting Window (menu: Window > Rendering > Lighting > SceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info See in Glossary) to give the final resolution of the lightmap in texels per unit of distance. Cluster Resolution The ratio of the cluster resolution (the resolution at which the light bounces are calculated internally) to the final lightmap resolution. See documentation on GI Visualizations in the Scene view for more information. Irradiance Budget This value determines the precision of the incoming light data used to light each texel in the lightmap. Each texelâs lighting is obtained by sampling a âviewâ of the Scene from the texelâs position. Lower values of irradiance budget result in a more blurred sample. Higher values increase the sharpness of the sample. A higher irradiance budget improves the lighting, but this increases run-time memory usage and might increase CPU usage. Irradiance Quality Use the slider to define the number of rays that are cast and used to compute which clusters affect a given output lightmap texel. Higher values offer visual improvements in the lightmap, but increase precomputing time in the Unity Editor. The value does not affect runtime performance. Modelling Tolerance This value controls the minimum size of gaps in MeshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info See in Glossary geometry that allows light to pass through. Make this value lower to allow light to pass through smaller gaps in your environment. Edge Stitching If enabled, this property indicates that UV charts in the lightmap should be joined together seamlessly, to avoid unwanted visual artifacts. Is Transparent If enabled, the object appears transparent during the Global Illumination calculations. Back-faces do not contribute to these calculations, and light travels through the surface. This is useful for invisible emissive surfaces. System Tag A group of objects whose lightmap Textures are combined in the same lightmap atlas is known as a âsystemâ. The Unity Editor automatically defines additional systems and their accompanying atlases if all the objects canât be fitted into a single atlas. However, it is sometimes useful to define separate systems yourself (for example, to ensure that objects inside different rooms are grouped into one system per room). Change the System Tag number to force new system and lightmap creation. The exact numeric sequence values of the tag are not significant. Baked GI

These parameters configure lightmapping.

See render pipeline feature comparison for more information about support for lightmapping across render pipelines.

Property Function Anti-aliasing Samples Determines the number of sub-texel positions to use when sampling a lightmap texel. Set the value above 1 to use supersampling to improve lightmap quality and reduce artifacts related to aliasing.
â¢A value of 1 disables super sampling.
â¢A value of 4 provides 2x2 supersampling. This is the default value which removes most aliasing artifacts.
â¢A value of 16 provides 4x4 supersampling. Use these values to remove artifacts, like jagged edges in direct lighting. This can happen when you use baked shadows.

Note: A higher anti-aliasing sample value uses more memory. This means that if you use a high sample number in a large Scene with large lightmap texture sizes, the lightmap bake might not complete.

Backface Tolerance Specifies the percentage of front-facing geometry sampling ray hits a texel must have for Unity to consider it valid. This makes it possible for Unity to invalidate a texel if too many of the rays cast from it hit backfaces (e.g. if the texel is inside geometry). A value of 1.0 means that Unity considers a texel invalid when any of its rays hits a backface, for example. When a texel is invalid, Unity clones valid values from surrounding texels to prevent artifacts. Lower this value to solve lighting problems caused by backface samples. Use the Texel Validity Scene View Draw Mode to adjust this value. Pushoff Pushes ray origins away from geometry along the normal based on the value you specify in modelling units. Unity applies this value to all baked lightmaps. It affects direct light, indirect light, and baked ambient occlusionA method to approximate how much ambient light (light not coming from a specific direction) can hit a point on a surface. See in Glossary. Adjust this setting to reduce self-occlusion and self-shadowing artifacts. Baked Tag Groups specific sets of objects in atlases. As with the System Tag, the exact numeric value is not significant. Unity never puts GameObjectsThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObjectâs functionality is defined by the Components attached to it. More info See in Glossary with different Baked Tag values in the same atlas. However, there is no guarantee that objects with the same tag end up in the same atlas because there may be too many objects with that tag to fit into one atlas. See image A (below) for an example of this. You do not need to set this value when you use the multi-scene bake API because Unity groups automatically in that case. You can use Baked Tag to replicate some of the behavior of the Lock Atlas option. See Baked Tags: Details for more information. Limit Lightmap Count Applies a limit to the number of lightmaps that Unity can use to pack together GameObjects with the same Baked Global Illumination settings. When you enable this limit, a related setting appears called Max Lightmaps. That setting determines the lightmap limit. The Lightmapping Settings define the size of these lightmaps.

Unity considers GameObjects to have the same Baked Global Illumination settings if they have equal values for Anti-aliasing Samples, Pushoff, Baked Tag, and Backface Tolerance. This means that Unity might pack together GameObjects associated with different Lightmap Parameter Assets.

To pack GameObjects into a set number of lightmaps, Unity scales down UV layouts until all fit within the specified number of lightmaps. This process may reduce lightmap resolution.

Baked AO

These parameters configure Baked Ambient Occlusion.

Property Function Quality The number of rays cast when evaluating baked ambient occlusion (AO). A higher numbers of rays increases AO quality but also increases bake time. Anti-aliasing Samples The number of samples to take when doing anti-aliasing of AO. A higher number of samples increases the AO quality but also increases the bake time. General GI Property Function Backface Tolerance The percentage of rays shot from an output texel that must hit front faces for the lighting system to consider them usable. This allows Unity to invalidate a texel if too many of the rays cast from it hit back faces ( (for example, if the texel is inside some geometry). The lighting system clones valid values from the surrounding texels to avoid unintended artifacts.

If Backface Tolerance is 0.0, the lighting system rejects the texel only if it sees nothing but backfaces. If it is 1.0, the lighting system rejects the ray origin if it has even one ray that hits a backface.

LightmapParameters

Lighting Settings Asset Inspector window reference

Debug Draw Modes for lighting reference

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