Unity asset pre/postprocessor for applying asset defaults by path.

ProjectAssetPostprocessor.cs

// Drop this script in the Editor directory in your project (creating the Editor directory if it's not there yet)
// Then re-import the assets in the directories covered by this script (right click and reimport)
//
// I would replace my path checking with the path checking from this gist:
//   https://gist.github.com/1842177
//
// The texture settings for icons might want to use some of his settings combined with mine as well


using UnityEngine;
using UnityEditor;
using System.Collections;


class ProjectAssetPostprocessor : AssetPostprocessor
{
	// audio asset preprocessor
	void OnPreprocessAudio()
	{
		// check if it's a music file
		if( assetPath.StartsWith( "Assets/Music" ) )
		{
			PreprocessMusic();
		}
	}
	
	// texture asset preprocessor
	void OnPreprocessTexture()
	{
		// check if it's a platform image (icons, splash, etc.)
		if( assetPath.StartsWith( "Assets/Platform" ) )
		{
			PreprocessPlatformImages();
		}
			
		// check if it's a sprite source image
		if( assetPath.StartsWith( "Assets/Sprites/Sources" ) )
		{
			PreprocessSpriteSource();
		}
		
		// check if it's a sprite texture atlas
		if( assetPath.StartsWith( "Assets/Sprites/Atlases" ) )
		{
			PreprocessSpriteAtlas();
		}
	}

	
	// preprocess music (2D, stream from disc, hardware decoding)
	void PreprocessMusic()
	{
		AudioImporter importer = (AudioImporter)assetImporter;
		
		importer.threeD = false;
		importer.loadType = AudioImporterLoadType.StreamFromDisc;
		importer.hardware = true;
	}

		
	// preprocess platform icons, etc.
	void PreprocessPlatformImages()
	{
		TextureImporter importer = (TextureImporter)assetImporter;
		
		importer.textureType = TextureImporterType.Advanced;
		importer.maxTextureSize = 4096;
		importer.npotScale = TextureImporterNPOTScale.None;
		importer.mipmapEnabled = false;
		importer.isReadable = true;
		importer.textureFormat = TextureImporterFormat.ARGB32;
	}

	
	// preprocess sprite source images (uncompressed, no mips, non-pow2, etc.)
	void PreprocessSpriteSource()
	{
		TextureImporter importer = (TextureImporter)assetImporter;
		
		importer.textureType = TextureImporterType.Advanced;
		importer.maxTextureSize = 4096;
		importer.npotScale = TextureImporterNPOTScale.None;
		importer.mipmapEnabled = false;
		importer.isReadable = true;
		importer.textureFormat = TextureImporterFormat.ARGB32;
	}


	// preprocess sprite texture atlases (uncompressed, mips, POT, filter, etc.)
	void PreprocessSpriteAtlas()
	{
		TextureImporter importer = (TextureImporter)assetImporter;
		
		importer.textureType = TextureImporterType.Advanced;
		importer.maxTextureSize = 4096;
		importer.mipmapEnabled = true;
	//	importer.mipmapFilter = TextureImporterMipFilter.BoxFilter;//.KaiserFilter;
		importer.isReadable = false;
	//	importer.filterMode = FilterMode.Bilinear;
		importer.textureFormat = TextureImporterFormat.ARGB32;
		importer.anisoLevel = 0;
		importer.wrapMode = TextureWrapMode.Clamp;
		importer.mipMapBias = -0.5f;
	}
}