dungeoncraft/art/generated/soul-core-heart/PROMPTS.md

Soul core heart - generated 3D model

Generated on 2026-11-07 with fal.ai. The prompt was written from the game's procedural soul core (draw_throne and draw_heart in src/render3d.rs): an obsidian stepped throne, four curved spikes with bone tips, iron chains holding a beating crystal heart, and glowing veins.

Step 1: concept image

• Model: fal-ai/flux-2-pro
• Settings: image_size: square_hd (1024x1024), output_format: png, seed: 4711
• Result: concept.png

Prompt:

A single dark-fantasy game prop, the "soul core" of an evil dungeon master, isometric three-quarter front view, full object visible and centered, on a plain neutral light-grey studio background, no floor, no scenery, no text.

The prop: a squat stepped pyramid throne of polished black-purple obsidian, four square tiers getting smaller towards the top. At each of the four corners of the base stands a short obsidian pillar, and from each pillar a thick curved obsidian spike rises and leans slightly outwards, its tip capped with yellowed bone. From near the top of every spike a heavy dark iron chain sags inwards and holds a floating heart.

The heart: a faceted crystal heart of deep blood-red ruby, classic heart shape with two rounded lobes and a pointed bottom, hovering about one heart-height above the top tier, held in the air only by the four chains. It glows from inside with hot red-orange light, a few brighter facets catch the light, faint embers drift upwards from it. Thin glowing red veins run across the obsidian steps from below the heart.

Style: stylized low-to-mid poly game asset, chunky readable silhouette, clean shapes, hand-painted textures, like a strategy game building seen from above. Even soft lighting, sharp focus, the whole prop fits in the frame with margin.

Step 2: image to 3D

• Model: fal-ai/hunyuan-3d/v3.1/pro/image-to-3d
• Input: concept.png (front view only, no extra views)
• Settings: generate_type: Normal (textured), face_count: 100000, enable_pbr: false
• Result: soul-core-heart.glb (about 20 MB, texture baked in; not used by the game yet), preview preview.png

No text prompt is used in this step. The model only sees the concept image.

Notes

• The throne, the chains and the heart are one fused mesh. The heart cannot be animated on its own; for a beating heart, generate it as a separate model (see below).
• In the concept the heart rests on a small glowing pedestal instead of floating freely.