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Run npx skillmds@latest add lamm-mit/pointcloud-generator in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Pointcloud Generator free to use?

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Who published Pointcloud Generator?

lamm-mit (@lamm-mit) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Pointcloud Generator by lamm-mit — Agent Skill

Name: Pointcloud Generator
Author: lamm-mit

Pointcloud Generator

Generate a colour-coded 3D point cloud (.xyz + .pcd) for bioinspired hierarchical ribbed membrane lattices — Cricket wing harp layer, Cicada tymbal corrugation layer, and multi-scale hierarchical lattice layer. Each structural element is analytically sampled (pure numpy, no LLM, no OpenSCAD) and assigned a distinct RGB colour. Produces ASCII XYZ, PCL v0.7 ASCII PCD, and a 4-panel PNG (isometric, top-XY, side-XZ, side-YZ). Chainable downstream of pointcloud-generator or upstream of fem-analysis.

lamm-mit 6d7d076 3 files · 33.9 KB Updated Sep 17, 2026

File contents

Point Cloud Generator

Generates a 3D point cloud for a Hierarchical Ribbed Membrane Lattice inspired by Gryllus bimaculatus (cricket wing harp) and cicada tymbal geometry.

Three structurally distinct Z-layers are sampled analytically:

Layer	Z offset	Structural feature	Colour
Cricket harp	0 mm	Base membrane + diagonal file ridge + parallel harp veins	grey / red / orange
Cicada tymbal	+1.5 mm	Cosine-graded corrugation ribs (tall centre, zero at edges)	blue
Hierarchical lattice	+3.0 mm	Primary / secondary / tertiary rib scales (3 densities)	dark / mid / light green

Usage

# From inline JSON spec
python3 {baseDir}/scripts/pointcloud_generator.py \
  --spec '{"biological_inspiration":"Cricket wing harp + Cicada tymbal",
           "rib_spacing_mm":2.5,"thickness_mm":0.4,"aspect_ratio":2.5,"num_scales":3}' \
  --output-dir /tmp/pointcloud_out

# From spec file
python3 {baseDir}/scripts/pointcloud_generator.py \
  --spec-file /path/to/spec.json \
  --output-dir /tmp/pointcloud_out

Output JSON (stdout)

{
  "xyz_path":  "/tmp/pointcloud_out/membrane_lattice.xyz",
  "pcd_path":  "/tmp/pointcloud_out/membrane_lattice.pcd",
  "png_path":  "/tmp/pointcloud_out/pointcloud_views.png",
  "total_points": 18348,
  "bounding_box_mm": {"x_min":0,"x_max":50,"y_min":0,"y_max":120,"z_min":-0.07,"z_max":3.80},
  "layers": {
    "cricket_harp":       {"points": 11496, "z_mm": 0.0},
    "cicada_tymbal":      {"points": 3000,  "z_mm": 1.5},
    "hierarchical_lattice":{"points": 3852, "z_mm": 3.0}
  }
}

Output Files

File	Format	Description
`membrane_lattice.xyz`	ASCII `x y z r g b`	Standard XYZ+RGB, one point per line
`membrane_lattice.pcd`	PCL v0.7 ASCII	Compatible with PCL, CloudCompare, Open3D
`pointcloud_views.png`	PNG	4-panel matplotlib figure, dark background

Geometry Parameters (from spec)

Field	Default	Effect
`rib_spacing_mm`	2.5	Primary rib pitch; secondary = ÷3, tertiary = ÷6
`thickness_mm`	0.4	Base membrane thickness; controls Z roughness
`aspect_ratio`	2.5	H = W × aspect_ratio (W fixed at 50 mm)
`num_scales`	3	Number of rib hierarchy levels (2 or 3)

Chaining

# Generate point cloud then run FEM on same spec
PCD=$(python3 skills/pointcloud-generator/scripts/pointcloud_generator.py \
        --spec '{"rib_spacing_mm":2.5,"thickness_mm":0.4}' \
        --output-dir /tmp/out | jq -r '.pcd_path')

python3 skills/fem-analysis/scripts/mechanism_analysis.py \
  --stl /tmp/out/membrane_lattice.xyz \   # FEM reads bounding box from any 3D file
  --topology cricket_harp \
  --rib-spacing-mm 2.5 --rib-height-mm 0.8

Colour Legend

■ grey   (180,180,180)  Base membrane
■ red    (220, 50, 50)  Diagonal file ridge (cricket harp)
■ orange (220,140, 50)  Harp veins (X-parallel)
■ blue   ( 50,100,220)  Cicada tymbal corrugation ribs (graded height)
■ dark ■ (20,120,50)    Primary ribs — level 1 (coarse, 2.5 mm pitch)
■ mid  ■ (80,180,80)    Secondary ribs — level 2 (medium, 0.83 mm pitch)
■ light■ (160,220,160)  Tertiary ribs — level 3 (fine, 0.42 mm pitch)

---name: pointcloud-generatordescription: Generate a colour-coded 3D point cloud (.xyz + .pcd) for bioinspired hierarchical ribbed membrane lattices — Cricket wing harp layer, Cicada tymbal corrugation layer, and multi-scale hierarchical lattice layer. Each structural element is analytically sampled (pure numpy, no LLM, no OpenSCAD) and assigned a distinct RGB colour. Produces ASCII XYZ, PCL v0.7 ASCII PCD, and a 4-panel PNG (isometric, top-XY, side-XZ, side-YZ). Chainable downstream of pointcloud-generator or upstream of fem-analysis.---# Point Cloud GeneratorGenerates a 3D point cloud for a **Hierarchical Ribbed Membrane Lattice** inspired by*Gryllus bimaculatus* (cricket wing harp) and cicada tymbal geometry.Three structurally distinct Z-layers are sampled analytically:| Layer | Z offset | Structural feature | Colour ||---|---|---|---|| Cricket harp | 0 mm | Base membrane + diagonal file ridge + parallel harp veins | grey / red / orange || Cicada tymbal | +1.5 mm | Cosine-graded corrugation ribs (tall centre, zero at edges) | blue || Hierarchical lattice | +3.0 mm | Primary / secondary / tertiary rib scales (3 densities) | dark / mid / light green |## Usage```bash# From inline JSON specpython3 {baseDir}/scripts/pointcloud_generator.py \ --spec '{"biological_inspiration":"Cricket wing harp + Cicada tymbal", "rib_spacing_mm":2.5,"thickness_mm":0.4,"aspect_ratio":2.5,"num_scales":3}' \ --output-dir /tmp/pointcloud_out# From spec filepython3 {baseDir}/scripts/pointcloud_generator.py \ --spec-file /path/to/spec.json \ --output-dir /tmp/pointcloud_out```## Output JSON (stdout)```json{ "xyz_path": "/tmp/pointcloud_out/membrane_lattice.xyz", "pcd_path": "/tmp/pointcloud_out/membrane_lattice.pcd", "png_path": "/tmp/pointcloud_out/pointcloud_views.png", "total_points": 18348, "bounding_box_mm": {"x_min":0,"x_max":50,"y_min":0,"y_max":120,"z_min":-0.07,"z_max":3.80}, "layers": { "cricket_harp": {"points": 11496, "z_mm": 0.0}, "cicada_tymbal": {"points": 3000, "z_mm": 1.5}, "hierarchical_lattice":{"points": 3852, "z_mm": 3.0} }}```## Output Files| File | Format | Description ||---|---|---|| `membrane_lattice.xyz` | ASCII `x y z r g b` | Standard XYZ+RGB, one point per line || `membrane_lattice.pcd` | PCL v0.7 ASCII | Compatible with PCL, CloudCompare, Open3D || `pointcloud_views.png` | PNG | 4-panel matplotlib figure, dark background |## Geometry Parameters (from spec)| Field | Default | Effect ||---|---|---|| `rib_spacing_mm` | 2.5 | Primary rib pitch; secondary = ÷3, tertiary = ÷6 || `thickness_mm` | 0.4 | Base membrane thickness; controls Z roughness || `aspect_ratio` | 2.5 | H = W × aspect_ratio (W fixed at 50 mm) || `num_scales` | 3 | Number of rib hierarchy levels (2 or 3) |## Chaining```bash# Generate point cloud then run FEM on same specPCD=$(python3 skills/pointcloud-generator/scripts/pointcloud_generator.py \ --spec '{"rib_spacing_mm":2.5,"thickness_mm":0.4}' \ --output-dir /tmp/out | jq -r '.pcd_path')python3 skills/fem-analysis/scripts/mechanism_analysis.py \ --stl /tmp/out/membrane_lattice.xyz \ # FEM reads bounding box from any 3D file --topology cricket_harp \ --rib-spacing-mm 2.5 --rib-height-mm 0.8```## Colour Legend```■ grey (180,180,180) Base membrane■ red (220, 50, 50) Diagonal file ridge (cricket harp)■ orange (220,140, 50) Harp veins (X-parallel)■ blue ( 50,100,220) Cicada tymbal corrugation ribs (graded height)■ dark ■ (20,120,50) Primary ribs — level 1 (coarse, 2.5 mm pitch)■ mid ■ (80,180,80) Secondary ribs — level 2 (medium, 0.83 mm pitch)■ light■ (160,220,160) Tertiary ribs — level 3 (fine, 0.42 mm pitch)```

Frequently asked questions