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godot shaders

Inverted hull outline pass

Draw a solid ink outline around a mesh by rendering its back faces pushed out along the normals, as a next pass on any existing material, with optional distance scaling so the line keeps a similar width on screen.

Recorded render of Inverted hull outline pass

What this component contains

  • ATTRIBUTION.md
  • LICENSE
  • README.md
  • component.json
  • demo.tscn
  • inspect_shader.py
  • material.tres
  • outline_inverted_hull.gdshader
  • preview.png
  • test_package.py
  • verification/native.json

How it works

Shader type
spatial
Render modes
unshaded, cull_front, shadows_disabled, fog_disabled
Parameters
outline_color (vec4 = 0.04, 0.03, 0.07, 1), thickness (float = 0.015), distance_scaling (float = 0.6), max_thickness (float = 0.08)
Use it on
A mesh with smooth normals and an existing base material; set `material.tres` as that material's `next_pass`.
Result
The mesh with a solid dark contour around its silhouette and along outer edges.
Renderers
compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
Placement
res://baltor/godot_shaders/outline_inverted_hull/

Recorded checks

godot 4.7.2.stable.official.ed1daf0bf

  • contract_static
  • engine_run
  • engine_log_clean
  • shader_in_scene
  • capture_written
  • render_not_uniform
  • shader_changes_pixels

Limits to consider

Hard-edged meshes (split normals, for example a BoxMesh) show gaps at the corners because each face moves along its own normal; use smoothed normals for those. Width is in object units, so non-uniform scale changes it. Inner creases are not outlined. The hull can poke through nearby geometry.