add mesh recipes

Author: SimonDanisch

REQUIRE

@@ -1,3 +1,4 @@
 StaticArrays
 Tables
 StructArrays
+AbstractPlotting # temporary dependency for convenience

src/abstractplotting.jl

@@ -0,0 +1,49 @@
+using AbstractPlotting
+import GeometryTypes
+
+function to_triangle(triangles, tetra)
+    push!(triangles, GeometryTypes.GLTriangle(tetra[1], tetra[2], tetra[3]))
+    push!(triangles, GeometryTypes.GLTriangle(tetra[2], tetra[3], tetra[4]))
+    push!(triangles, GeometryTypes.GLTriangle(tetra[2], tetra[3], tetra[4]))
+    push!(triangles, GeometryTypes.GLTriangle(tetra[3], tetra[1], tetra[4]))
+end
+function to_lines(lines, tetra)
+    push!(lines, tetra[1], tetra[2])
+    push!(lines, tetra[2], tetra[3])
+    push!(lines, tetra[3], tetra[4])
+    push!(lines, tetra[2], tetra[4])
+    push!(lines, tetra[1], tetra[4])
+end
+
+
+function AbstractPlotting.convert_arguments(T::Type{<: AbstractPlotting.Lines}, mesh::AbstractVector{<: GeometryBasics.Tetrahedron})
+    points = GeometryTypes.Point3f0[]
+    for elem in mesh
+        to_lines(points, elem)
+    end
+    return (points,)
+end
+
+function AbstractPlotting.convert_arguments(::Type{<: AbstractPlotting.Mesh}, mesh::GeometryBasics.Mesh{T, N, <: GeometryBasics.Tetrahedron}) where {T, N}
+    points = GeometryTypes.Point3f0.(coordinates(mesh))
+    triangles = GeometryTypes.GLTriangle[]
+    for elem in faces(mesh)
+        to_triangle(triangles, elem)
+    end
+    return (GeometryTypes.GLNormalMesh(points, triangles),)
+end
+
+function AbstractPlotting.convert_arguments(T::Type{<: AbstractPlotting.Wireframe}, mesh::GeometryBasics.Mesh)
+    m = convert_arguments(AbstractPlotting.Mesh, mesh)[1]
+    return convert_arguments(T, m)
+end
+function AbstractPlotting.convert_arguments(p::AbstractPlotting.PointBased, mesh::GeometryBasics.Mesh)
+    return convert_arguments(p, GeometryTypes.Point.(coordinates(mesh)))
+end
+
+function AbstractPlotting.convert_arguments(::Type{<: AbstractPlotting.Mesh}, mesh::GeometryBasics.Mesh)
+    (GeometryTypes.GLNormalMesh(
+        GeometryTypes.Point3f0.(coordinates(mesh)),
+        GeometryTypes.GLTriangle.(faces(mesh))
+    ),)
+end