Forgecad Image Prompt

---
name: forgecad-image-prompt
description: Write builder-honest AI image prompts from a concrete ForgeCAD model, build brief, HLD, or LLD without hiding how the artifact is built.
forgecad-public: true
---

# Image Prompt

## Scope

Only for artifacts already concrete enough to visualize (a specific `.forge.js` model, build brief, or HLD); route vague briefs to `forgecad-design-spec` first. Read minimum context — entry `.forge.js`, one key helper if it delegates geometry, brief/HLD — and capture what must survive the image model: artifact type and scale, major subassemblies, actuation style, visible mechanisms, material and color cues.

## Core Rule

Image prompts, not concept art: show the final artifact clearly, preserve build and subsystem truth, and keep visible the seams, modules, hardware, and mechanical hierarchy that matter.

Negatives (the only negatives list — reuse it, never restate variants):

- no fake sleek consumer shell, no hidden mechanics
- no over-smoothed geometry, no sci-fi styling
- no CAD-drawing, blueprint, or dimension-arrow pretense
- no cutaway, sectioned, or exploded teaching view unless the user explicitly asks
- no text, labels, or humans

## Prompt Skeleton

Block order: identity → mechanism truth → materials/color truth → pose/state → shot/camera/lighting → negatives. Fill in, don't copy:

```text
A [artifact identity and scale], designed as a real buildable CAD-driven object, not a fantasy concept. [Major subassemblies and mechanism truth]. [Materials, colors, finish, visible hardware]. Show it in [pose / state]. [Shot, camera, background, lighting]. It should look physically buildable and mechanically honest, with visible part boundaries and serviceable architecture. No [negative 1], no [negative 2], no [negative 3].
```

Default shot: `front-left three-quarter hero view, eye-level product camera`. Alternate: `rear-right three-quarter view showing motor placement and belt routing`.

## Modes

Default to ONE honest hero render; add support prompts only when the user asks. Prefer separate single-purpose images over collages or multi-view boards.

| Mode | Job | Signature phrases |
|------|-----|-------------------|
| Honest hero render (default) | Final object clearly, still reads as buildable | `clean premium studio product render`, `physically buildable and mechanically honest` |
| Builder-first mechanical | Teach the build; bias to interfaces, seams, mounted actuators | `clear visibility of interfaces, seams, and subsystem boundaries`, `serious prototype, not a polished consumer shell` |
| Mild exploded | Assembly logic; major modules only, no per-screw chaos. Image-only — the CAD model stays the complete assembled product | `major modules separated by small clean gaps`, `no tiny floating fragments` |
| Workshop prototype realism | Feel like a real first prototype | `visible print lines and honest surface texture`, `uncluttered engineering bench background` |
| End-effector close-up | Wrist/gripper mechanism detail | `close-up on the wrist and end effector showing the mechanism clearly` |

## Writing Rules

- Use real artifact language: base, turntable, shoulder, rails, bearings, gripper, belt, pulley, shaft.
- Prefer visible subsystem truth over poetic adjectives.
- Keep exact dimensions out unless they matter visually and are already known.
- If a detail is uncertain, stay honest at the subsystem level — never invent internals.
- Ask for "physically buildable", "mechanically honest", "visible part boundaries" when central.
- Mention motors, belts, pulleys, shafts, guide rods, fasteners, or service covers only if genuinely part of the artifact.
- A short strong prompt beats a style dump.

## Output Contract

Return: one sentence interpreting the artifact, the primary prompt first (usually the honest hero render), optional support prompts, and a short which-to-try-first note. Never bury the prompts under theory.