# texelDataWithBottomLeftOrigin(atMipLevel:create:) Returns the texture’s image data for the specified mipmap level, organized such that its first pixel represents the bottom-left corner of the image. ``` func texelDataWithBottomLeftOrigin(atMipLevel level: Int, create: Bool) -> Data? ``` ## Parameters `level` The mipmap level for which to access image data; must be less than or equal to the texture’s [`mipLevelCount`](/documentation/ModelIO/MDLTexture/mipLevelCount) value. `create` If and the texture does not contain image data for the specified mipmap level (that is, the level parameter is greater than the texture’s [`mipLevelCount`](/documentation/ModelIO/MDLTexture/mipLevelCount) value) Model I/O generates image data for that mipmap level. If , this method returns `nil` for mipmap levels where no image data exists. ## Return Value The texture’s image data, or `nil` if data is not available. ## Discussion Mipmapping is a technique that uses multiple sizes of a texture image to increase rendering performance. The image for mipmap level zero matches the size in the [`dimensions`](/documentation/ModelIO/MDLTexture/dimensions) property. Mipmap level 1 is an image at half the original dimensions; level 2 is at quarter size; and so on. If the texture was initialized with image data in top-left-origin format, the first call to this method creates and caches image data in bottom-left-origin format. This method returns `nil` if the texture was not initialized with image data and is not a [`MDLTexture`](/documentation/ModelIO/MDLTexture) subclass capable of loading or generating its own data. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)