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Radial lens distortion with auto fit

In your harnessGodot shaderMIT

Bend the image like a real lens with the Brown-Conrady radial model: barrel or pincushion distortion from two coefficients, an automatic zoom that hides empty corners, and an optional dark rim.

Render of Radial lens distortion with auto fit
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), k1 (float = 0.22), k2 (float = 0.06), auto_fit (bool = yes), zoom (float = 1), edge_darkening (float = 0.3)
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 bulging outward with bent straight lines and slightly darker corners.
Renderers
compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
Placement
res://baltor/godot_shaders/post_lens_distortion/

Limits. Sampling the already rendered frame loses resolution at the centre when zoomed. Tangential (decentring) distortion is not modelled. 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, 78.3 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
Brown-Conrady radial distortion polynomial, Automatic fit scale from the corner radius
Tags
godot shader, spatial, post-process, lens distortion, barrel, pincushion, camera, full-screen
Identity
library.supply.creative_originals.e132db6a86bbd456cf570415.4f3f0e6fa7ead573
Version
4f3f0e6fa7ead5733ae065694e6e53715cc65c1be55ef8638f424c81138a7671

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

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