Question 1

Is this a free CrazyBump / Materialize alternative for 2D lights?

Accepted Answer

It covers the common case: generate normal, height and roughness from albedo in the browser (Sobel or optional DeepBump) for Unity 2D Lights and Godot 2D lighting. Open https://gameimagekit.com/en/tool/normal-map — nothing is uploaded.

Question 2

Are my images uploaded to a server?

Accepted Answer

No. Sobel and DeepBump both run locally in your browser — nothing is uploaded. Sobel needs no download; ONNX downloads ~27MB on first use, then the browser cache reuses it.

Question 3

Sobel or ONNX?

Accepted Answer

Pixel art, UI relief and hard-edge sprites: Sobel — instant, no model. Photos, scanned materials, floors and walls: ONNX (DeepBump) follows color more closely, but needs a first-time download and tiled 256 inference on large images. The pixel-art preset switches back to Sobel.

Question 4

Unity or Godot?

Accepted Answer

Unity (including 2D Lights / Shader Graph) uses DirectX normals with an inverted green channel — pick Unity. Godot 2D normal maps are OpenGL — pick Godot. If the preview bump is inverted, toggle “Invert Y (green)”.

Question 5

Can I use this with Unity 2D Lights?

Accepted Answer

Yes. Assign _n.png as the sprite Mask / Normal map (or the URP 2D Lit Normal Map). In Unity set the texture type to Normal map and disable sRGB. Transparent pixels are written as a flat normal with alpha kept.

Question 6

Where do height and roughness come from?

Accepted Answer

Sobel: height defaults to luminance (invert so dark becomes high); roughness from height slope. ONNX: height is integrated from nx/ny, roughness from |n.xy|. Adjust bias and contrast, or invert for Smoothness. Fast approximation, not scanned PBR.

Question 7

How do I keep normals seamless on a tile?

Accepted Answer

Enable wrap-around sampling: Sobel wraps at the edges; ONNX height integration also closes the loop. You can run the Seamless Tile tool on the albedo first, then generate maps here.

Normal / Height / Roughness