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CMYK halftone print screens

In your harnessGodot shaderMIT

Reproduce colour printing: the image is split into cyan, magenta, yellow and black, each printed as dots on its own rotated grid with dot size following the ink amount, then composited on paper.

Render of CMYK halftone print screens
The render its check recorded in Godot 4.7.2, 256 by 256 pixels.

What it takes and gives

Shader type
spatial
Render modes
unshaded, cull_disabled, depth_test_disabled, depth_draw_never, skip_vertex_transform, fog_disabled
Parameters
screen_texture (sampler2D), dot_spacing (float = 7), dot_softness (float = 0.8), paper_color (vec4 = 0.97, 0.95, 0.9, 1), ink_strength (float = 1), monochrome (bool = no)
Use it on
A MeshInstance3D with a 2 x 2 QuadMesh, material.tres as its material override and a large extra cull margin, as in demo.tscn.
Result
The scene printed as overlapping cyan, magenta, yellow and black dot screens on cream paper.
Renderers
compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
Placement
res://baltor/godot_shaders/post_halftone_dots/

Limits. Dots sample the ink at each pixel, not at the cell centre, so dot edges follow image edges slightly. The RGB to CMYK conversion is the naive formula without colour management. Dot spacing is in screen pixels. The pass reads Godot's screen texture after opaque geometry, so transparent objects drawn after it are not processed and its order among other transparent passes is not controlled.

Details

Kind
Godot shader
Engine
Godot 4.3 or later
Files
11 files, 174.9 KB
Licence
MIT
Declared effects
reads files, runs commands
Checked with
Godot 4.7.2, opengl3 compatibility (Mesa llvmpipe, Xvfb)
Checks
contract static, engine run, engine log clean, shader in scene, capture written, render not uniform, shader changes pixels
Techniques
CMYK separation, Rotated halftone screens at traditional angles, Dot area proportional to ink, Subtractive compositing
Tags
godot shader, spatial, post-process, halftone, cmyk, print, comic, full-screen
Identity
library.supply.creative_originals.32e23b2d4352099303e40624.6450c388b39175a3
Version
6450c388b39175a3ab13ea96624790d7f211fc35148b3d0786d9e7263799c76c

The version is the SHA-256 of the item your harness downloads; every file in it names its own checksum.

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