Iris-Mechanism Skylight

8-Blade Aperture • Ammo.js Hinge Constraints • Sunlight Simulation • r = f(θ) • OBJ / GLB / STL

← Back to Index

Iris Geometry

Blade Count 8

Outer Ring Radius 3.0

Blade Length 2.8

Blade Width 1.4

Blade Thickness 0.08

Ring Thickness 0.25

Actuator Control

Aperture θ (°) 0

Motor Speed 2.0

Motor Impulse 5.0

Auto-Animate Open/Close

Animation Speed 1.0

Sunlight

Sun Elevation (°) 60

Sun Azimuth (°) 45

Sun Intensity 2.0

Sun Color

Shadow Map Size 2048

Iris Aperture Skylight — 3D

Blades: — • Aperture r: — • θ: 0° • Tris: —

Aperture Metrics

Aperture Radius r

—

units

Open Area

—

units²

Light Transmission

—

Blade Count	—
Outer Ring R	—
Blade Angle θ	—
Min Aperture r	—
Max Aperture r	—
Total Triangles	—
Hinge Constraints	—
Physics Bodies	—

Shadow Analysis

Sun Elevation	—
Sun Azimuth	—
Shadow Area	—
Penumbra Factor	—

Mathematics

Aperture Radius: r(θ) = R − L · sin(θ)
where R = outer ring radius, L = blade length, θ = rotation angle

Open Area: A(θ) = π · r(θ)²
Transmission: T = A(θ) / A(0) × 100%

Blade Motion: Each blade pivots on btHingeConstraint
Actuator: Single motor variable drives all 8 hinges simultaneously
Constraint: Overlapping blades rotate without clipping via phase offset = 2π/N

Export

Ready. Configure iris and click Build.