This is a list of common problems, their symptoms and solutions.
- 1 Shadowmasks are not baked
- 2 Shadowmasks are baked, but Unity renders real-time shadows instead
- 3 Using a version control system I copied the scene to another PC and it doesn't look right
- 4 Baking same asset in one scene breaks its UVs in another scene
- 5 Denoiser throws error 505 or Unknown error
- 6 I get an “Out of memory” error
- 7 I get a “Can't map texture” error
- 8 After importing Bakery I get errors containing “obsolete” and “UnityUpgradable”
- 9 I get a "Can't load" error
- 10 I get a "Launch timeout" error
- 11 I have an Android project, and lightmaps don't look good
- 12 I get too many lightmaps
- 13 I get jagged shadows
- 14 "Exporting scene - preparing" is taking too long
- 15 Stuck at "Waiting for Unity to initialize the probes..."
- 16 Baked prefabs instantiated at runtime in a build have no lightmaps
- 17 Speedtrees look fine in the editor, but black in builds
- 18 HDRI produces scattered bright spots (fireflies)
- 19 "Adjusting UV padding" happens too often and takes too much time
- 20 Denoiser produces bright edges around geometry/shadows
- 21 Light probes are too bright in Subtractive mode
- 22 Baking produces "Not allowed to access uv2" errors
- 23 Whole scene is very bright or black
- 24 Lightmaps look black or have bad quality in an HDRP scene
- 25 Bakery says "Device is not DX11"
- 26 Bakery doesn't work on my 3070/3080/3090 GPU?
- 27 Denoiser produces grid-like patterns
- 28 I get "rtcRes == RTC_SUCCESS" error
- 29 HDRP project crashes when trying to bake
- 30 Baking any scene crashes with unknown error
- 31 Combined meshes (e.g. using Mesh Combine asset) bake incorrectly
- 32 I get a "Can't create vertex buffer" error
Shadowmasks are not baked
Check following things:
- Bakery's Render Mode is set to Shadowmask.
- Masked lights have both Unity and Bakery light components on them.
- Masked Bakery light components have "Baked contribution" set to "Indirect and shadowmask".
Shadowmasks are baked, but Unity renders real-time shadows instead
You're in Distance Shadowmask mode, it's expected. Read more about the difference:
- To switch between two modes, you can use "Distance Shadowmask" checkbox in Bakery main window.
- If you're on 5.6, go to Window->Lighting->Mixed Lighting->Lighting Mode to switch the mode.
Using a version control system I copied the scene to another PC and it doesn't look right
Make sure you followed version control guidelines.
Baking same asset in one scene breaks its UVs in another scene
The reason here is UV padding adjustment. It modifies the UVs in the asset, so spacing between UV charts is optimal, meaning they never leak over each other and there is no much wasted space. Unity has a manual Pack Margin option on model assets, but it’s limited since it applies the same exact value for all meshes inside the model, while each mesh can get drastically different size in the final lightmap based on its surface area. Therefore Bakery overrides it with automatically calculated per-mesh (instead of per-model) padding. However, because “optimal” varies depending on baking resolution, it can be problematic to reuse the same asset in isolated scenes with different lightmap size. There are multiple ways to solve it:
- Generate your own optimal UVs. UV padding adjustment only applies to models with auto-generated UV layout (aka “Generate Lightmap UVs” checkbox) and never touches custom data.
- Use UV padding: increase only checkbox and first bake the lowest resolution scene, and then the rest.
- Just disable UV padding adjustment. Results will be similar to built-in baking.
- Use two different models for different lightmap resolutions, so each will get the most efficient set of UVs.
- Bake both scenes together.
- Lock UVs using Save UV padding to asset
Denoiser throws error 505 or Unknown error
If you are using a Kepler GPU, try switching to legacy denoiser.
I get an “Out of memory” error
This means rendering needed more video memory from your GPU than it has available.
First, try closing any other graphics-intensive programs (browsers too).
If the problem persists, the most likely reason is that the resolution you selected is unreasonably high for the given scene. Resolution is defined by Texels per Unit (this section also has a list of reference values) or set explicitly in Lightmap Groups. Reducing it will help. You can always selectively use high resolution for important objects via Scale in Lightmap.
If you have terrains in your scene, make sure Terrain optimization is enabled.
If you have a very high amount of painted trees on your terrain, try disabling the Export terrain trees option.
I get a “Can't map texture” error
Typically happens if your system went out of RAM (system memory, not video memory) during the scene export process. Your scene could already be taking too much RAM by itself, not leaving enough free memory for Bakery export.
- Try closing any memory-intensive programs before baking.
- Try reducing Max Resolution from 4096 to 2048.
- If you are baking very highly detailed (millions of triangles) geometry, try excluding some of it from the bake.
- Try disabling Export terrain trees.
- Try enabling Terrain optimization.
This error can also be shown in case of GPU driver crash, in which case Unity editor also won't render anything.
After importing Bakery I get errors containing “obsolete” and “UnityUpgradable”
Before importing Bakery, make sure you don't have any compilation errors in your project.
Restart Unity, reimport the package. Click “I made a backup, go ahead” if Unity asks.
See this page for more details.
It is also known that some versions of Unity Hub have a bug preventing API updater from running.
I get a "Can't load" error
If Bakery says it can't load something, make sure you have enough free disk space on the drive used for temporary data.
Some parts of Bakery can't deal with non-ASCII characters (this is going to be fixed soon). Try naming your scenes and lightmap group assets with ASCII characters. Latin letters and numbers must always work.
I get a "Launch timeout" error
This error can happen if your GPU took more time than it is allowed by Windows TDR.
- Try lowering the value of Tile Size, especially if it's higher than 512, so baking job is split into smaller chunks.
- Depending on the pass being processed, try lowering the Samples value (e.g. GI samples, Skylight samples, etc).
- Reduce geometric complexity of the scene, if tile size/samples don't help.
- Try disabling Terrain Optimization.
- As a last resort, disable TDR registry keys. This will prevent Windows from resetting the driver, but your computer may appear unresponsive during the bake.
I have an Android project, and lightmaps don't look good
Sometimes, when working on Android projects, you may encounter banding artifacts, with gradients having discrete steps of different hue. This is caused by texture compression and HDR encoding Unity uses for this platform, which often turns out to be "Double LDR" (see details). The problem is not exclusive to Bakery and will as well happen with built-in lightmaps.
In Player Settings, set Lightmap Encoding to High Quality.
If your target devices support ASTC compression, make sure it is enabled in Build settings. PVRTC is also a good choice, although it is mostly supported on iOS devices. ETC compression gives poor results for lightmaps.
If above solutions are not enough, select lightmap assets and set texture compression quality to High or None (try both).
Note that setting it to None will use more video memory on the device.
I get too many lightmaps
Possible causes are:
- Texels Per Unit value is high or Max Resolution is low. Bakery packs objects from open scenes into multiple lightmap atlases and packs them as rectangles (in a fashion similar to this) with their size dependent on (surface area * texels per unit). If some object can't fit into existing atlases, a new one is allocated. New atlases are always as large as the Max Resolution parameter, or smaller (but not smaller than Min Resolution), if the estimated surface area of remaining unpacked objects is below some threshold. You can also increase Min Resolution a bit, replacing a bunch of small (but dense) maps with a few large (but possibly with some empty space).
- If you bake multiple open scenes and Split by scene checkbox is on, different scenes will never share the same lightmap, therefore multiplying their count.
- If Terrain optimization is on, terrains will always use a separate lightmap.
Pre-atlasing your scene in your modelling package of choice and using the Original UV mode instead of relying on the auto-atlaser can significantly improve packing effectiveness.
Since v1.71 Bakery prints number of future used lightmaps to console when enabling/refreshing Checker Preview. You can experiment with resolution/density settings until the desired value is printed.
I get jagged shadows
"Exporting scene - preparing" is taking too long
- Try setting Atlas Packer to Default.
- Make sure you use reasonable Texels Per Unit value.
- Make sure your meshes are correctly unwrapped.
Stuck at "Waiting for Unity to initialize the probes..."
There isn't much Bakery can do about the logic of Unity lighting data asset generation (there is no API in the engine to control it at the moment). Try to focus editor window (especially scene view) to wake Unity up.
Baked prefabs instantiated at runtime in a build have no lightmaps
Because Unity technically has no support for prefabs having lightmaps, it can omit lightmapped shader versions from builds, not realizing they are needed. You can fix it by going to Shader stripping settings and enabling lightmap modes you use. Additionally, try disabling Optimize Mesh Data in Player Settings, as Unity may omit UV from the build.
Speedtrees look fine in the editor, but black in builds
Also related to shader stripping. See the prefab solution.
HDRI produces scattered bright spots (fireflies)
This artefact comes from the fact your HDRI has very bright, yet very small parts, typically sun. Rays will miss it often, producing occasional spots when they don't. This problem is well known in many offline ray tracers as well.
- Use Direct Light for the sun
- Remove sun from HDRI (also recommended by Unity)
- Possibly downsample/blur the HDRI
Similar problem may also occur when using very small and very bright emissive surfaces, or similarly small surfaces lit by a very intense light. You can use Light Meshes instead of small emissives to prevent it.
"Adjusting UV padding" happens too often and takes too much time
UV padding adjustment is a feature that optimizes asset UVs based on the size they take in lightmaps. This process will happen for a model if:
- Option is globally enabled.
- Asset has "Generate Lightmap UVs" checkbox enabled. Models with custom UVs are not adjusted.
- Model was not adjusted before or...
- ... its lightmap size has changed.
Therefore it can be triggered for all auto-unwrapped models after their geometry or resolution changes. UV padding adjustment will try to waste less lightmap resolution and reduce texel leaking, but it is not necessary. If you are doing many experimental/draft bakes, you may consider disabling it (set to "Don't change"), then possibly enabling it back for the final quality bake.
Also note that using xatlas as Unwrapper can be notoriously slower comparing to Default.
Denoiser produces bright edges around geometry/shadows
Sometimes you may encounter bright edges or spots at high contrast edges caused by the denoising neural net, most notably OptiX 6 and 7.
- Use OptiX 5 or OpenImageDenoise if you can (denoiser option).
- Try enabling Denoise: Fix bright edges.
- Try setting texture compression to None on lightmap assets.
- Try setting Backface GI to 1, removing dark shadows inside objects. While these shadows are normally not visible, their edges may cause problems for both the denoiser and texture compression.
Light probes are too bright in Subtractive mode
Light occlusion information is not baked into probes. Solution:
- Set your Unity directional light to Mixed mode.
- Enable Occlusion Probes.
Some versions of Unity may need a scene reload to properly apply the Lighting Data Asset.
Baking produces "Not allowed to access uv2" errors
All lightmapped models must have Read/Write enabled on.
Whole scene is very bright or black
- Check if your light intensities are in a reasonable range (< 100).
- Check the same for indirect intensity on all lights. A multiplication of direct and intensity intensity must not go into thousands, otherwise GI algorithm may overflow.
- Check if you don't use assets with High mesh compression. When set to High, Unity mesh compression will completely destroy lightmap UVs, only leaving 8 bits for them. This may produce many lightmapping errors including this one.
Lightmaps look black or have bad quality in an HDRP scene
Bakery should work fine in HDRP, but pre-exposure can be a problem:
"When using physical light unit, the intensity of lights can be really high and cause precision issue and clamping of highlight. To counteract this effect HDRP use pre-exposure."
... meaning many typical HDRP scenes are set up in such a way that all lights have extremely high intensities (>1000) and then shaders divide it back for on-screen display. This peculiar behaviour is unique to HDRP. It is unclear why exactly HDRP authors decided to use huge values without converting them to a reasonable range in advance, as current behaviour may cause various inaccuracies during lighting bake or data conversion due to numeric precision. Bakery specifically does not work well with values like that and may produce aforementioned clamping and other problems. The resulting lightmaps may either look black or have very bad quality. Using sane intensity and exposure values will fix the problem. Note that using lower intensities does not make it less "physical" as units are relative. What was previously 1000 can be treated as 10 if you use a brighter exposure value. It's important to maintain the realistic balance/contrast between different light sources though.
Bakery says "Device is not DX11"
Currently Bakery needs Unity editor to be running in DX11 mode to directly exchange texture data, so make sure your editor's window header says "<DX11>". If it does not, change active graphics API to DX11:
- Go to Player Settings.
- If "Auto Graphics API for Windows" is unchecked, you will see a list of APIs.
- Make sure "Direct3D11" is on top or place it there.
Bakery doesn't work on my 3070/3080/3090 GPU?
1. Please enable RTX mode.
Updated denoiser (both new OptiX version and OpenImageDenoise) as well as automatic hardware detection will be soon released on the Asset Store.
Denoiser produces grid-like patterns
OptiX denoiser might produdce grid-like patterns when fed with very low-precision lightmaps. Low precision is usually caused by either extremely dark or extremely bright lighting. It is recommended to stay within reasonable intensity range (see a similar advice for HDRP above).
- Alternatively use OpenImageDenoise, as it does not produce this pattern.
- This issue also does not affect OptiX 5.1 denoiser ("Legacy denoiser") as its training dataset is in its own DLL, but affects the non-legacy version (OptiX 6.0) and only on driver versions newer than 442.50, as the training datasets are in the driver (explanation from NVIDIA).
I get "rtcRes == RTC_SUCCESS" error
You are using a 3xxx GPU with RTX mode disabled. Enable RTX mode.
HDRP project crashes when trying to bake
Make sure your editor is in DX11 mode. Latest github patch fixes the crash (shows a message asking to enable DX11 instead).
Baking any scene crashes with unknown error
There were some reports that Avast antivirus can block Bakery from running, even though Bakery's executables don't trigger any antivirus (including Avast) when scanned via VirusTotal. Perhaps it just block any executables that were launched 'indirectly', i.e. from another application. In any case, if you have Avast, try adding your project folder to exception list.
Combined meshes (e.g. using Mesh Combine asset) bake incorrectly
Most mesh combining assets have an option to regenerate lightmap UVs. Without it, combined UVs will overlap each other. If you are using Mesh Combine, make sure "Regenerate Lightmap UVs" option is enabled in output settings.
I get a "Can't create vertex buffer" error
This error can happen if the scene has more than ~40 million vertices. It is recommended to reduce geometric complexity of the scene, as tracing it would be too slow anyway. The typical cause of going over this limit is trying to bake with large arrays of trees painted on the terrain. In this case try disabling Export Terrain Trees.