CesiumForUnreal打包失败

wszty · March 30, 2025, 1:22pm

用的是UE5.2，Cesium版本是2.5.0。突然出现如下的打包失败，正在寻求帮助：
UATHelper: 打包 (Windows): LogInit: Display: LogShaderCompilers: Warning: Failed to compile Material /CesiumForUnreal/Materials/M_CesiumBaseMaterial.M_CesiumBaseMaterial (MI:/CesiumForUnreal/Materials/Instances/MI_CesiumThreeOverlaysAndClippingAndWater.MI_CesiumThreeOverlaysAndClippingAndWater) for platform PCD3D_SM6, Default Material will be used in game.
UATHelper: 打包 (Windows): Shader is using too many Samplers: 17 (only 16 supported)
UATHelper: 打包 (Windows): LogInit: Display: LogShaderCompilers: Warning: Failed to compile Material /CesiumForUnreal/Materials/M_CesiumBaseMaterial.M_CesiumBaseMaterial (MI:/CesiumForUnreal/Materials/Instances/MI_CesiumThreeOverlaysAndClippingAndWater.MI_CesiumThreeOverlaysAndClippingAndWater) for platform PCD3D_SM5, Default Material will be used in game.
PackagingResults: Warning: Cooking a material resource (in M_CesiumBaseMaterial hierarchy) that doesn’t have a valid ShaderMap! Shadermap pointer is null.
PackagingResults: Warning: Cooking a material resource (in M_CesiumBaseMaterial hierarchy) that doesn’t have a valid ShaderMap! Shadermap pointer is null.
PackagingResults: Error: Unknown Cook Failure

janine · April 2, 2025, 3:29pm

Hi @wszty,

I am using UE5.2 and Cesium version 2.5.0. Suddenly the following packaging failure occurred and I am looking for help:

Are you using your own materials in your project? Or are you only using the ones that are provided through the plugin?

Either way, the log is saying that a shader is using too many samplers, which can happen if a material has many textures. Can you try the suggestion in the Github issue below and let us know if it helps?

github.com/CesiumGS/cesium-unreal

Consider setting texture sampler sources to Shared:Wrap

opened 09:38PM - 10 Jun 21 UTC

argallegos

enhancement performance

In the CesiumGlTFFunction and CesiumRasterOverlay material functions, we use a l…ot of Texture Sample nodes, which means that we are by default at 10/16 texture samplers for the M_CesiumOverlay material and 12/16 for M_CesiumOverlayWater. This definitely limits future materials that we or users may need to create. If we set the Sampler Source on each Texture Sample to Shared:Wrap, we can significantly reduce the texture samplers to 3/16 for the overlay material and 4/16 for the water material. ![image](https://user-images.githubusercontent.com/39537389/121599698-6ef90380-ca11-11eb-9bd2-3e848cfd7fba.png) From my preliminary testing, it hasn't changed the appearance of tilesets at all. In addition, it doesn't look like there are really known issues that arise from doing this. One user in [this thread](https://forums.unrealengine.com/t/downsides-to-using-shared-texture-sampler-source/89759#post967276) posted that Shared: Wrap doesn't work with Metal, which may cause trouble for mac builds. We should definitely test this out, and figure out if there are any other drawbacks of changing the Sampler Source to this. If not, this would be a helpful change. If you want to test this out, I've set the materials to use Shared: Wrap in the[ reduce-tex-samples branch](https://github.com/CesiumGS/cesium-unreal/tree/reduce-tex-samples).

Thank you!

wszty · April 8, 2025, 8:21am

感谢您的解答，但是set the Sampler Source on each Texture Sample to Shared:Wrap并没有修复此告警。场景中存在一些其他告警修复后打包成功了

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CesiumForUnreal打包失败

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