# MeshIO, BasicGeometry, AbstractPlotting -- type mismatchs and incompatibility

**URL:** <https://discourse.julialang.org/t/meshio-basicgeometry-abstractplotting-type-mismatchs-and-incompatibility/46850>\
**Category:** Visualization\
**Created:** [September 18, 2020, 2:24pm UTC](https://discourse.julialang.org/t/meshio-basicgeometry-abstractplotting-type-mismatchs-and-incompatibility/46850 "2020-09-18T14:24:28Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Allan\_Baker](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/allan_baker/32/42645_2.png) [@Allan\_Baker](https://discourse.julialang.org/u/Allan_Baker)\
**Post date:** [September 18, 2020, 2:24pm UTC](https://discourse.julialang.org/t/meshio-basicgeometry-abstractplotting-type-mismatchs-and-incompatibility/46850/1 "2020-09-18T14:24:28Z")

</div>

I had some Julia code that loaded in OBJ format files into Meshes and then plotted them with mesh! or wireframe! using Makie, etc. I stored the obj after loading in a struct where the obj mesh type had to be set to: `GeometryBasics.FaceMesh{3,Float32,GeometryBasics.GLTriangleElement}` to make it work.

I updated to Julia 1.5.1 and in this same package, the BasicGeometry and AbstractGeometry started conflicting with each other over Point3f0, so I had to fully qualify those as BasicGeometry.Point3f0. I don’t know why those were no longer compatible.

But I can’t get past this error with the Mesh not being able to identify the MeshIO type:

I define the object based on the error I got which was:  
`GeometryBasics.Mesh{3,Float32,GeometryBasics.Ngon{3,Float32,3,GeometryBasics.Point{3,Float32}},FaceView{GeometryBasics.Ngon{3,Float32,3,GeometryBasics.Point{3,Float32}}}}`

So in my code, I have, among other lines of code:

```julia
using FileIO
using AbstractPlotting
using GeometryBasics
...
const ObjMeshType = GeometryBasics.Mesh{3,Float32,GeometryBasics.Ngon{3,Float32,3,GeometryBasics.Point{3,Float32}},FaceView{GeometryBasics.Ngon{3,Float32,3,GeometryBasics.Point{3,Float32}}}}
#const ObjMeshType = GeometryBasics.GLNormalMesh
#const ObjMeshType = GeometryBasics.FaceMesh{3,Float32,GeometryBasics.GLTriangleElement}

struct GraphicObject
        filename::String
        obj::ObjMeshType #Loaded with load
        [...]
end

```

I get the following abnoxious error, which I don’t understand because I’ve told it the mesh type.

```julia
  GeometryBasics.Mesh{3,Float32,GeometryBasics.Ngon{3,Float32,3,GeometryBasics.Point{3,Float32}},FaceView{GeometryBasics.Ngon{3,Float32,3,GeometryBasics.Point{3,Float32}}}} to an object of type and the error message seems to be telling me something else.
  GeometryBasics.AbstractMesh{GeometryBasics.Ngon{Dim,Float32,3,GeometryBasics.PointMeta{Dim,Float32,GeometryBasics.Point{Dim,Float32},(:normals,),Tuple{GeometryBasics.Vec{3,Float32}}}}} where Dim

```

The structure GraphObject initializes the obj field with a load(filename) to an OBJ file.

Any thoughts on how to debug this?

Best Regards,  
Allan Baker