unity runtime_error ai_generated true

ArgumentException: TerrainData.SetAlphamaps - 透明度贴图分辨率与地形数据不匹配

ArgumentException: TerrainData.SetAlphamaps - alphamap resolution does not match terrain data

ID: unity/terrain-alphamap-resolution-mismatch

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90%修复率
84%置信度
1证据数
2023-09-20首次发现

版本兼容性

版本状态引入弃用备注
Unity 2021.3 active — — —
Unity 2022.3 active — — —
Unity 2023.1 active — — —

根因分析

传递给TerrainData.SetAlphamaps的透明度贴图（混合贴图）纹理的分辨率与地形配置的透明度贴图分辨率（宽度和高度）不匹配，导致数组维度不一致。

English

The alphamap (splatmap) texture passed to TerrainData.SetAlphamaps has a resolution that does not match the terrain's configured alphamap resolution (width and height), causing an array dimension mismatch.

generic

官方文档

https://docs.unity3d.com/ScriptReference/TerrainData.SetAlphamaps.html

解决方案

  1. 在调用SetAlphamaps之前，确保float数组维度与地形的透明度贴图分辨率匹配：int width = terrainData.alphamapWidth; int height = terrainData.alphamapHeight; int layers = terrainData.alphamapLayers; float[,,] alphamaps = new float[height, width, layers]; 然后填充并赋值。
  2. 如果使用纹理作为源，先读取其像素到2D数组，使用双线性插值重新采样到正确分辨率，然后再转换为3D float数组。
  3. 使用terrainData.GetAlphamaps(0, 0, width, height)获取当前的透明度贴图，仅修改必要的单元格，然后使用相同维度调用SetAlphamaps。

无效尝试

常见但无效的做法:

  1. 95% 失败

    SetAlphamaps expects a 3D float array (float[,,]), not a Texture2D. Resizing a texture does not convert it to the correct data format.

  2. 60% 失败

    While this can work, it alters the terrain's base settings and may affect performance or other scripts that depend on the original resolution.

  3. 90% 失败

    The error prevents alphamap updates, so terrain texturing will be incomplete or incorrect, leading to visual bugs.