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Computes and stores baked lightmaps for fast global illumination.
The LightmapGI node is used to compute and store baked lightmaps. Lightmaps are used to provide high-quality indirect lighting with very little light leaking. LightmapGI can also provide rough reflections using spherical harmonics if directional is enabled. Dynamic objects can receive indirect lighting thanks to light probes, which can be automatically placed by setting generate_probes_subdiv to a value other than GENERATE_PROBES_DISABLED. Additional lightmap probes can also be added by creating LightmapProbe nodes. The downside is that lightmaps are fully static and cannot be baked in an exported project. Baking a LightmapGI node is also slower compared to VoxelGI.
Procedural generation: Lightmap baking functionality is only available in the editor. This means LightmapGI is not suited to procedurally generated or user-built levels. For procedurally generated or user-built levels, use VoxelGI or SDFGI instead (see Environment.sdfgi_enabled).
Performance: LightmapGI provides the best possible run-time performance for global illumination. It is suitable for low-end hardware including integrated graphics and mobile devices.
Note: Due to how lightmaps work, most properties only have a visible effect once lightmaps are baked again.
Note: If no custom lightmappers are installed, LightmapGI can only be baked when using the Vulkan backend (Forward+ or Mobile), not OpenGL.
BakeQuality BAKE_QUALITY_LOW =
Low bake quality (fastest bake times). The quality of this preset can be adjusted by changing ProjectSettings.rendering/lightmapping/bake_quality/low_quality_ray_count and ProjectSettings.rendering/lightmapping/bake_quality/low_quality_probe_ray_count.
BakeQuality BAKE_QUALITY_MEDIUM =
Medium bake quality (fast bake times). The quality of this preset can be adjusted by changing ProjectSettings.rendering/lightmapping/bake_quality/medium_quality_ray_count and ProjectSettings.rendering/lightmapping/bake_quality/medium_quality_probe_ray_count.
BakeQuality BAKE_QUALITY_HIGH =
High bake quality (slow bake times). The quality of this preset can be adjusted by changing ProjectSettings.rendering/lightmapping/bake_quality/high_quality_ray_count and ProjectSettings.rendering/lightmapping/bake_quality/high_quality_probe_ray_count.
BakeQuality BAKE_QUALITY_ULTRA =
Highest bake quality (slowest bake times). The quality of this preset can be adjusted by changing ProjectSettings.rendering/lightmapping/bake_quality/ultra_quality_ray_count and ProjectSettings.rendering/lightmapping/bake_quality/ultra_quality_probe_ray_count.
GenerateProbes GENERATE_PROBES_DISABLED =
Don't generate lightmap probes for lighting dynamic objects.
GenerateProbes GENERATE_PROBES_SUBDIV_4 =
Lowest level of subdivision (fastest bake times, smallest file sizes).
GenerateProbes GENERATE_PROBES_SUBDIV_8 =
Low level of subdivision (fast bake times, small file sizes).
GenerateProbes GENERATE_PROBES_SUBDIV_16 =
High level of subdivision (slow bake times, large file sizes).
GenerateProbes GENERATE_PROBES_SUBDIV_32 =
Highest level of subdivision (slowest bake times, largest file sizes).
BakeError BAKE_ERROR_OK =
Lightmap baking was successful.
BakeError BAKE_ERROR_NO_SCENE_ROOT =
Lightmap baking failed because the root node for the edited scene could not be accessed.
BakeError BAKE_ERROR_FOREIGN_DATA =
Lightmap baking failed as the lightmap data resource is embedded in a foreign resource.
BakeError BAKE_ERROR_NO_LIGHTMAPPER =
Lightmap baking failed as there is no lightmapper available in this Godot build.
BakeError BAKE_ERROR_NO_SAVE_PATH =
Lightmap baking failed as the LightmapGIData save path isn't configured in the resource.
BakeError BAKE_ERROR_NO_MESHES =
Lightmap baking failed as there are no meshes whose GeometryInstance3D.gi_mode is GeometryInstance3D.GI_MODE_STATIC and with valid UV2 mapping in the current scene. You may need to select 3D scenes in the Import dock and change their global illumination mode accordingly.
BakeError BAKE_ERROR_MESHES_INVALID =
Lightmap baking failed as the lightmapper failed to analyze some of the meshes marked as static for baking.
BakeError BAKE_ERROR_CANT_CREATE_IMAGE =
Lightmap baking failed as the resulting image couldn't be saved or imported by Godot after it was saved.
BakeError BAKE_ERROR_USER_ABORTED =
The user aborted the lightmap baking operation (typically by clicking the Cancel button in the progress dialog).
EnvironmentMode ENVIRONMENT_MODE_DISABLED =
Ignore environment lighting when baking lightmaps.
EnvironmentMode ENVIRONMENT_MODE_SCENE =
Use the scene's environment lighting when baking lightmaps.
Note: If baking lightmaps in a scene with no WorldEnvironment node, this will act like ENVIRONMENT_MODE_DISABLED. The editor's preview sky and sun is not taken into account by LightmapGI when baking lightmaps.
EnvironmentMode ENVIRONMENT_MODE_CUSTOM_SKY =
Use environment_custom_sky as a source of environment lighting when baking lightmaps.
EnvironmentMode ENVIRONMENT_MODE_CUSTOM_COLOR =
float bias =
The bias to use when computing shadows. Increasing bias can fix shadow acne on the resulting baked lightmap, but can introduce peter-panning (shadows not connecting to their casters). Real-time Light3D shadows are not affected by this bias property.
int bounces =
Number of light bounces that are taken into account during baking. Higher values result in brighter, more realistic lighting, at the cost of longer bake times. If set to
0, only environment lighting, direct light and emissive lighting is baked.
The CameraAttributes resource that specifies exposure levels to bake at. Auto-exposure and non exposure properties will be ignored. Exposure settings should be used to reduce the dynamic range present when baking. If exposure is too high, the LightmapGI will have banding artifacts or may have over-exposure artifacts.
bool directional =
true, bakes lightmaps to contain directional information as spherical harmonics. This results in more realistic lighting appearance, especially with normal mapped materials and for lights that have their direct light baked (Light3D.light_bake_mode set to Light3D.BAKE_STATIC). The directional information is also used to provide rough reflections for static and dynamic objects. This has a small run-time performance cost as the shader has to perform more work to interpret the direction information from the lightmap. Directional lightmaps also take longer to bake and result in larger file sizes.
EnvironmentMode environment_mode =
The environment mode to use when baking lightmaps.
GenerateProbes generate_probes_subdiv =
The level of subdivision to use when automatically generating LightmapProbes for dynamic object lighting. Higher values result in more accurate indirect lighting on dynamic objects, at the cost of longer bake times and larger file sizes.
Note: Automatically generated LightmapProbes are not visible as nodes in the Scene tree dock, and cannot be modified this way after they are generated.
bool interior =
true, ignore environment lighting when baking lightmaps.
The LightmapGIData associated to this LightmapGI node. This resource is automatically created after baking, and is not meant to be created manually.
int max_texture_size =
The maximum texture size for the generated texture atlas. Higher values will result in fewer slices being generated, but may not work on all hardware as a result of hardware limitations on texture sizes. Leave max_texture_size at its default value of
16384 if unsure.
BakeQuality quality =
The quality preset to use when baking lightmaps. This affects bake times, but output file sizes remain mostly identical across quality levels.
bool use_denoiser =
true, uses a CPU-based denoising algorithm on the generated lightmap. This eliminates most noise within the generated lightmap at the cost of longer bake times. File sizes are generally not impacted significantly by the use of a denoiser, although lossless compression may do a better job at compressing a denoised image.
Note: The built-in denoiser (OpenImageDenoise) may crash when denoising lightmaps in large scenes. If you encounter a crash at the end of lightmap baking, try disabling use_denoiser.