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procedural textures

Galvanized steel spangle

Generate tileable PBR maps of hot-dip galvanized steel: zinc crystals (spangles) that each take their own brightness and roughness, feathered dendrites inside every crystal, and optional dull white zinc corrosion. Use for ducts, railings, buckets, roofing and industrial props.

Recorded render of Galvanized steel spangle

What this component contains

  • ATTRIBUTION.md
  • LICENSE
  • README.md
  • blender_material.py
  • component.json
  • galvanized_spangle.py
  • material.tres
  • pngio.py
  • preview.png
  • test_package.py
  • texkit.py
  • verification/native.json

How it works

Entry point
generate
Maps
albedo, normal, roughness, metallic, height, ao
Parameters
crystals_across, contrast, dendrites, white_rust, hue_shift, saturation, brightness
Presets
default, minimized, weathered, bold_spangle
Tileable
yes
Command line
python galvanized_spangle.py --size 1024 --seed 7 --preset NAME --out DIR [--width W --height H] [--set NAME=VALUE] [--directx-normal] [--orm]
Godot material
material.tres
Blender builder
blender_material.build_material(folder)

Recorded checks

godot 4.7.2.stable.official.ed1daf0bf

  • command_line_generates_declared_maps
  • maps_decode
  • maps_have_declared_size_and_channels
  • maps_tile_without_a_seam
  • normal_vectors_unit_length_facing_out
  • maps_carry_detail
  • godot_imports_the_maps
  • godot_material_template_loads_every_map
  • godot_compatibility_render
  • capture_shows_the_textured_surface
  • blender_builds_the_material

Limits to consider

Each crystal's brightness is baked into albedo and roughness; real spangle changes with the angle of light and view, which fixed maps cannot reproduce. Dendrites are a stylized stripe-and-herringbone pattern. White rust is a flat dielectric overlay. Occlusion is a blurred-height estimate, not ray traced.