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WOM1/WOM2 had a single mesh with one texture, which lost the multi-submesh structure of complex M2 models (body+hair+eyes+armor each need different textures and blend modes). WOM3 adds a Batch array: each batch has indexStart/indexCount + a textureIndex into texturePaths + blendMode + flags. Loader is fully backward compatible: WOM1/WOM2 files still load, and WOM3 with no batches block falls back to a single full-mesh batch. fromM2 now extracts batches with materials, and toM2 emits matching M2 batches so the renderer can draw them correctly.