mirror of
https://gitlab.com/MisterBiggs/stl-process.git
synced 2025-08-03 12:01:33 +00:00
108 lines
3.6 KiB
Julia
108 lines
3.6 KiB
Julia
using Test
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using stlProcess
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import stlProcess.Properties
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using FileIO
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using MeshIO
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using LinearAlgebra
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function _check_volume(triangles; scale=1)
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"""
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Slow, inaccurate algorithm just used to test the other algorithms
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Reference:
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https://people.eecs.berkeley.edu/~wkahan/VtetLang.pdf
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"""
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volume = 0.0
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for tri in triangles
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a, b, c = tri .* scale
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W = sqrt(sum((a .- b) .^ 2))
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V = sqrt(sum((b .- c) .^ 2))
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U = sqrt(sum((c .- a) .^ 2))
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v = sqrt(sum(a .^ 2))
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u = sqrt(sum(b .^ 2))
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w = sqrt(sum(c .^ 2))
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X = (w - U + v) * (U + v + w)
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Y = (u - V + w) * (V + w + u)
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Z = (v - W + u) * (W + u + v)
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x = (U - v + w) * (v - w + U)
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y = (V - w + u) * (w - u + V)
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z = (W - u + v) * (u - v + W)
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ξ = sqrt(x * Y * Z)
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η = sqrt(y * Z * X)
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ζ = sqrt(z * X * Y)
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λ = sqrt(x * y * z)
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volume += sqrt((ξ + η + ζ - λ) * (λ + ξ + η - ζ) * (η + ζ + λ - ξ) * (ζ + λ + ξ - η)) / (192 * u * v * w)
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end
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return volume
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end
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@testset "3D Models" begin
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I_mat = Matrix(I, 3, 3)
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center = [0, 0, 0]
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models = Dict(
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# Inertia math: https://en.wikipedia.org/wiki/List_of_moments_of_inertia#List_of_3D_inertia_tensors
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# Properties(volume, center_of_gravity, inertia, surface_area, characteristic_length)
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"cube.stl" => Properties(2.0^3, center, I_mat .* 2^2 / 6, 6 * 2^2, 2, [2, 2, 2]), # l = 2
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"sphere.stl" => Properties(4 / 3 * pi, center, I_mat .* 2 / 5, 4π, 2, [2, 2, 2]), # r = 1
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"2_4_8_cuboid.stl" => Properties(
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2 * 4 * 8,
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center,
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diagm([2^2 + 4^2, 8^2 + 2^2, 8^2 + 4^2]) ./ 12,
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2(2 * 4 + 2 * 8 + 4 * 8),
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(2 + 4 + 8) / 3,
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[2, 4, 8],
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), # h, d, w = 2, 4, 8
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# "slender_y.stl" => Properties(
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# 10 * π * 0.1^2,
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# center,
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# diagm([1, 0, 1]) .* (10^2 / 12),
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# 2π * 0.05 * (0.1 + 10),
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# 0.55,#TODO: figure out why this math doesnt work (10 + 0.2 + 0.2) / 3
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# ), # l_z = 10, r = 0.1
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# "cylinder.stl" => Properties(
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# 10 * π * 1^2,
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# center,
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# diagm([(3 + 10^2) / 12, (3 + 10^2) / 12, 1^2 / 2]),
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# 2π * 1 * (1 + 10),
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# 2.24,#TODO: figure out why this math doesnt work (10 + 2 + 2) / 3,
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# ), # l_z = 10, r = 1
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)
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@testset "$model" for (model, control) in models
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path = "test_assets/$model"
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stl = load(path)
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@testset "get_mass_properties for $model" begin
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props = get_mass_properties(stl)
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@test props.volume ≈ control.volume atol = 0.5
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@test props.center_of_gravity ≈ control.center_of_gravity atol = 0.01
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@test eigvals(props.inertia) ≈ eigvals(control.inertia) atol = 0.1
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@test props.surface_area ≈ control.surface_area atol = 0.5
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@test props.characteristic_length ≈ control.characteristic_length atol = 0.5
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@test props.sb_values ≈ control.sb_values atol = 0.01
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end
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@testset "Compare volumes with scaling for $model" begin
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for scale in 1:4
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props = get_mass_properties(stl; scale=scale)
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volume = _check_volume(stl; scale=scale)
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@test props.volume ≈ volume atol = 0.1
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end
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end
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@testset "find_volume" begin
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for scale in [0.5, 1, 1.0, 10, 2 / 3]
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@test fast_volume(stl; scale=find_scale(stl; desired_volume=scale)) ≈ scale
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end
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end
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end
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end |