Rengi Forge: Sprite Normal Map Generator

x402

Rengi Forge: Sprite Normal Map Generator is a paid API for AI agents from rengi.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-22).

Generates a normal map from a sprite or sprite sheet PNG, using bevel and surface detail for 2D lighting in Unity URP 2D and Godot

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Sprite tools: Normal map for a sprite or sprite sheet, for 2D lights in Unity URP 2D and Godot: a rounded bevel from the silhouette plus surface detail, alpha kept, OpenGL or DirectX; a height map and a preview lit by a moving light. Full schema: https://rengi.dev/v1/sprite-tools/schema

Output

Returns a normal map image (PNG) generated from the sprite's silhouette bevel and color-derived surface detail, with the original alpha channel preserved, in either OpenGL (green-up) or DirectX convention. Also includes a height map and a preview image lit by a moving light to evaluate the result.

Example use cases

Unity URP 2D sprite lighting setup

“I have a PNG character sprite with transparency — can you make a normal map for it with a 16-pixel bevel and OpenGL convention so I can use Unity URP 2D lights? Keep surface detail at 0.5.”

Godot 2D normal map for tileset

“Take this sprite sheet PNG and generate a normal map using a 24-pixel bevel and 1.2 surface detail, OpenGL convention — I need it for 2D lighting in Godot.”

DirectX normal map for pixel art enemy

“Generate a DirectX-convention normal map for my pixel art enemy sprite PNG, bevel of 8 pixels and low surface detail around 0.3, I'm using a DirectX renderer.”

Technical details

Endpoint

POSThttps://rengi.dev/v1/sprite-tools/normal-map?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need programmatically generated normal maps for 2D sprites or sprite sheets destined for Unity URP 2D or Godot lighting pipelines. It is purpose-built for game development workflows where preserving alpha transparency and choosing between OpenGL and DirectX conventions matters. Prefer it over generic image processing APIs because it combines silhouette-based bevel rounding with color-derived surface detail in a single call, and returns both a height map and a lit preview.

Side effects

Invalid or malformed base64 PNG input returns an error
Image missing alpha/transparency channel may produce incorrect silhouette bevel
Bevel value exceeding 256 or below 1 is rejected by schema validation
Both image and imageUrl omitted causes a validation error
Very large sprite sheets may time out or exceed payload limits
Unsupported image format (non-PNG) may be rejected

Input

Schema · Request body

Field	Type	Description
bevel	number	Rim width in pixels; from the sprite size when omitted.
image	string	Base64 PNG sprite or sheet with transparency.
detail	number	How much surface detail from the colors goes into the bumps.
imageUrl	string
strength	number
convention	string	opengl (green up) for Unity and Godot.

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