Batches, loops and logic

Run one pipeline over a list with Split Text and Loop, keep part of a list with Slice Items, gather results with Group Items and branch with If-Else.

  • Lesson 4 of 6
  • Checked Nov 11, 2026

About this lesson

Four reference sheets of one character are only useful if they match. In this lesson you chain the four generators of the Anatomy reference sheets workflow, so each sheet is made from the one before, run the whole graph with one shortcut, and then run it for a whole cast with Group Items and a Loop. The model on every generator is GPT Image 2.5 Sunburst. The models and settings in this lesson are as of November 2026.

See moreSee less
  • Run one working pipeline over a list with Split Text and Loop, then filter, gather and branch the results.
  • Build and check the single-item version first: a loop repeats mistakes as faithfully as good work.
  • Cost is linear: ten items cost about ten times one, and the badge shows it before you run.
Step by step in the web app (10 steps)Hide the steps
  1. Open the workflow and make room

    Open Anatomy reference sheets from the Project tab, click Switch to Edit Mode, zoom out and drag the framing rule under the character.

  2. Add Output B, the pencil sketch

    Press Option+I for an Image Generator on GPT Image 2.5 Sunburst and name it 4. Output B - Pencil. Wire 3. Final Prompt B into Prompt, then the character and Output C into its reference input.

    Prompt
    Redraw this character illustration as a traditional graphite pencil sketch on textured off-white paper.
    
    Keep the exact same pose, proportions, silhouette, outfit, camera angle and framing as the source.
    
    PRESERVE EVERY ELEMENT OF THE CHARACTER: capes, cloaks, hoods, belts, straps, armor, gloves, boots, bags, weapons, wings, tails, jewelry and hair must all be drawn, with the same shape, length and placement as in the reference. Do not remove or simplify any part of the design.
    
    Hand-drawn look: confident construction lines, light underdrawing still visible, expressive contour linework, no cross-hatching, a few darker accent strokes for depth, subtle eraser highlights. Monochrome graphite only — no color, no digital gradients, no background scenery, just clean paper.
    
    Style: professional character design study sketch from an artist's sketchbook, figure drawing reference, no text, no watermark.
    
    Output the image in a 9:16 vertical portrait aspect ratio.
    
    If the source image is cropped (bust, half-body, or cut off at any edge), extend it into a COMPLETE FULL-BODY figure: reconstruct the missing torso, hips, legs and feet in a natural continuation of the pose, and frame the whole figure head-to-toe, centered in the 9:16 vertical frame with a small margin of empty space above the head and below the feet. Keep the same character design, proportions, style and camera direction. If the source already shows the full body, keep the pose and framing, just fit it into the 9:16 vertical frame.
  3. Add Output A, the gray sculpt

    Press Option+I again for 4. Output A - Gray Sculpt. Wire 3. Final Prompt A into Prompt and Output B into its reference input.

    Prompt
    Convert this character illustration into a neutral gray digital sculpture — an artist's anatomy/form reference maquette, like a ZBrush sculpt rendered with a matte gray matcap material.
    
    Keep the exact same pose, proportions, silhouette, camera angle and framing as the source.
    
    PRESERVE EVERY ELEMENT OF THE CHARACTER. Do not delete, simplify or omit anything that exists in the source image: capes, cloaks, coats, hoods, scarves, skirts, belts, straps, harnesses, armor pieces, pauldrons, gloves, boots, bags, weapons, tools, wings, tails, horns, jewelry, hair strands and any other accessory or equipment must all be present and sculpted as part of the statue, with the same shape, size, length, flow and placement as in the reference. Sculpt hair and flowing fabric (cape, cloak, coat tails) as solid gray sculpted volumes with the same drape and direction of movement. If an element is unclear in the source, sculpt a plausible version of it rather than removing it. Nothing may be replaced by bare body.
    
    Under the outfit, the body reads as a simple, modest, opaque full-coverage form-fitting bodysuit (long sleeves, full legs, high neckline) sculpted as part of the statue, so the underlying muscle structure and body forms read clearly through smooth, seamless surfacing. Fully clothed, non-revealing, no skin exposure beyond head and hands, no suggestive posing — a museum-style study figurine.
    
    Neutralize only SURFACE APPEARANCE, never geometry: remove all color, hair color, fabric texture, patterns, prints, logos and background detail, and render every element — body, outfit, cape, hair, gear — in one uniform mid-gray clay material with soft studio lighting, gentle specular matcap shading and a subtle rim light, on a plain neutral dark gray backdrop.
    
    Style: professional anatomy study reference, sculpting maquette, clean topology and clearly defined muscle groups and form volumes, no text, no watermark.
    
    Output the image in a 9:16 vertical portrait aspect ratio.
    
    If the source image is cropped (bust, half-body, or cut off at any edge), extend it into a COMPLETE FULL-BODY figure: reconstruct the missing torso, hips, legs and feet in a natural continuation of the pose, and frame the whole figure head-to-toe, centered in the 9:16 vertical frame with a small margin of empty space above the head and below the feet. Keep the same character design, proportions, style and camera direction. If the source already shows the full body, keep the pose and framing, just fit it into the 9:16 vertical frame.
  4. Add Output D, the textured sculpt

    Add 4. Output D - Textured. Wire 3. Final Prompt D into Prompt, then the character and Output A into its reference input.

    Prompt
    Convert this character illustration into a 3D digital sculpture — a fully textured render of the character as a collectible statue / game-ready model, like a ZBrush sculpt with the original color textures and materials applied.
    
    Keep the exact same pose, proportions, silhouette, camera angle and framing as the source.
    
    KEEP THE ORIGINAL COLORS AND TEXTURES. Match the character's palette exactly as seen in the reference: skin tone, hair color, eye color, and every color of the outfit, cape, armor and accessories. Reproduce the material qualities of each part — matte or worn fabric with visible weave, brushed or scratched metal with real specular highlights, glossy leather, rough stone, translucent gems, glowing emissive parts — so each surface reads as its real material, not as clay.
    
    PRESERVE EVERY ELEMENT OF THE CHARACTER. Do not delete, simplify or omit anything that exists in the source image: capes, cloaks, coats, hoods, scarves, skirts, belts, straps, harnesses, armor pieces, pauldrons, gloves, boots, bags, weapons, tools, wings, tails, horns, jewelry, hair strands and any other accessory or equipment must all be present and sculpted, with the same shape, size, length, flow and placement as in the reference. Sculpt hair and flowing fabric as solid volumes with the same drape and direction of movement. If an element is unclear in the source, sculpt a plausible version of it rather than removing it.
    
    The figure is fully clothed and modest — no skin exposure beyond what the outfit already leaves visible, no suggestive posing. A display statue.
    
    Render it as a clean 3D render: crisp sculpted geometry, high-detail surface work, soft neutral studio lighting with a subtle rim light, soft contact shadows, on a plain neutral dark gray backdrop. No painted-illustration look, no 2D shading — it must read as a physical sculpted and painted figure.
    
    Style: professional character turnaround render, collectible figure product shot, no text, no watermark.
    
    Output the image in a 9:16 vertical portrait aspect ratio.
    
    If the source image is cropped (bust, half-body, or cut off at any edge), extend it into a COMPLETE FULL-BODY figure: reconstruct the missing torso, hips, legs and feet in a natural continuation of the pose, and frame the whole figure head-to-toe, centered in the 9:16 vertical frame with a small margin of empty space above the head and below the feet. Keep the same character design, proportions, style and camera direction. If the source already shows the full body, keep the pose and framing, just fit it into the 9:16 vertical frame.
  5. Check the estimate and run everything

    Press Cmd+0, read the estimate next to Run, then press Cmd+Shift+Enter to run every node; it starts with no confirmation. The results stay on the nodes.

  6. Duplicate the workflow for a cast

    Open the ... menu at the top right, choose Duplicate Workflow, and click Switch to Edit Mode in the copy.

  7. Replace the character with two inputs

    Delete 1. Character Illustration, press Shift+I twice, and pick a character in each with Select from Library: the ranger and Queen Pip.

  8. Group the inputs into one list

    Click +, search Group Items and add it. Wire Image 1 and Image 2 into it.

  9. Add a Loop

    Search Loop, add it, wire Group Items 1 into its Input List and click Add Loop End.

  10. Wire the loop

    Wire the Loop's item into the references of Output C, Output B and Output D, and Output D's result into Loop 1 (End). Test one item first with Slice Items; the estimate doubles for two characters.

CoursesLessonsBrowseMy learning