Changes to Make the normal map of an image, for 2.5D lighting: a lossless WebP of the same size and alpha as the image (transparent pixels are flat), in the OpenGL convention (red = right, green = up, blue = towards the viewer; Unity and Godot read it as is, Unreal expects green flipped). Pixel art gets one normal per art pixel, and the map of a seamless tile tiles the same way. An image you generated on Ludo is read with its type and pixel grid; for any other image pixel art is detected. Free, and limited to 20 calls per 5 minutes, 120 an hour and 1000 a day (HTTP 429 beyond). To get maps with new images or spritesheets, pass save_normals: true to the generation instead. The image is uploaded and validated, and an image larger than 15MB is rejected with HTTP 400. Requires an API key (user scope). The call returns 202 with a job id - poll `GET /assets/jobs/{id}`, honouring poll_after_ms or long-polling with wait=30, until status is succeeded; its result field is exactly the response documented for this operation. Synchronous responses are deprecated but still supported: pass `async: false` to block until the result is ready and receive it as the response body. Synchronous calls run on the same queue: the response carries an X-Ludo-Job-Id header, and a job still running after 15 minutes comes back as 202 with the job instead of an error. Each account may have up to 50 generations queued or running at once via the API; a request beyond that returns 429 (code PENDING_JOBS_LIMIT).