Heightmaps
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Format: We recommend EXR for highest quality.
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File Size: The maximum allowed file size for heightmaps is 15MB per file. This limitation is due to automatic compression isn't available at the moment. This limitation will increase in the future.
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Texture Size: Maximum size of 4K (4096x4096).
note
Similar to other texture files, we recommend adhering to the power of two rule when creating heightmaps. You can learn more here