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improve merge(meshes) #199

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Merged
SimonDanisch merged 1 commit into from
Jul 18, 2023
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improve merge(meshes) #199

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16 changes: 11 additions & 5 deletions src/meshes.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -228,17 +228,23 @@ function Base.merge(meshes::AbstractVector{<:Mesh})
elseif length(meshes) == 1
return meshes[1]
else
m1 = meshes[1]
ps = copy(coordinates(m1))
fs = copy(faces(m1))
ps = reduce(vcat, coordinates.(meshes))
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@jkrumbiegel jkrumbiegel Jul 11, 2023

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couldn't this all be written with a single allocated vector for ps and fs, and writing to that in the loop? We should know all lengths

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@JonasIsensee JonasIsensee Jul 12, 2023

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It surely could.
This was just faster than the more elaborate allocate+loop versions I tested.

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@JonasIsensee JonasIsensee Jul 18, 2023

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Is that an acceptable answer to merge this ? ;)

fs = reduce(vcat, faces.(meshes))
idx = length(faces(meshes[1]))
offset = length(coordinates(meshes[1]))
for mesh in Iterators.drop(meshes, 1)
append!(fs, map(f -> f .+ length(ps), faces(mesh)))
append!(ps, coordinates(mesh))
N = length(faces(mesh))
for i = idx .+ (1:N)
fs[i] = fs[i] .+ offset
end
idx += N
offset += length(coordinates(mesh))
end
return Mesh(ps, fs)
end
end


"""
pointmeta(mesh::Mesh; meta_data...)

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