previewDirectionalSprites

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Preview Directional Sprites: a few frames of a 3D model in a style, from each direction asked for, to check a style before rendering. Takes the same model, animation, camera and style fields as createDirectionalSprites. The response (synchronous, not a job) has one preview per direction, in the order asked, each with `frame_urls` - the frames as images (4 for an animated model, 1 for a still one) - and `render_3d`, the style and settings as rendered, which createDirectionalSprites takes back as they are. Free (no credits), and nothing is saved to your generations; the frame images are kept for 7 days. A preview takes several seconds. You run one preview at a time: starting another while one is still running cancels the older one, which then answers 204 with no body. Preview one or two directions while trying styles and render only once the look is right.