Wavefront OBJ importer for the plotly Dash framework

Dash is a Python framework for building analytical web applications. This library helps you to get 3D ObJ into the framework's 3dmesh graph type

Source is here:

https://github.com/aegis1980/dash-obj-in-3dmesh.git

Also on pypi, installed using:

pip install dash-obj-in-3dmesh

Some notes:

File locations

Put your wavefront obj & mtl file in 'data/obj' directory in the root directory of your Dash app. Alternatively pass a path to:

import_geometry(obj_names : List[str], path = _config.GEOMETRY_DIR)

Geometry

v4.0 Added support importing OBJ files with quads. Dash graph.Mesh3d can only display triangulated meshes. Imported quad are split in mesh_tools.split_quad() into two tris with the fold line on the quad diagonal which produces the least curvature (i.e. the widest angle between the tri normals)
Textures, normals and everything else are ignored - only vertices, faces, materials, groups and object names are parsed and passed to Dash graph as mesh data.
...so to speeden things up strip all that data out of your files pre-deployment

Materials

obj file can have an accompanying materials file, but only basic materials supported in mtl file: e.g:

newmtl diffuse_Green
Ka 0.0000 0.0000 0.0000
Kd 0.0000 1.0000 0.0000
Ks 1.0000 1.0000 1.0000
Tf 0.0000 0.0000 0.0000
d 1.0000
Ns 0.0000

Only the value for Kd is used - so set this as your colour (in modelling software).

Code example

import dash
import dash_obj_in_3dmesh


model_name = "test" #.obj & .mtl files in data/obj

axis_template = {
    "showbackground": False,
    "visible" : False
}

plot_layout = {
    "title": "",
    "margin": {"t": 0, "b": 0, "l": 0, "r": 0},
    "font": {"size": 12, "color": "white"},
    "showlegend": False,
    'uirevision':'same_all_the_time', #this keeps camera position etc the same when data changes.
    "scene": {
        "xaxis": axis_template,
        "yaxis": axis_template,
        "zaxis": axis_template,
        "aspectmode" : "data",
        "camera": {"eye": {"x": 1.25, "y": 1.25, "z": 1.25}},
        "annotations": [],
    },
}

def layout():
 return html.Div([dcc.Graph(
          id="graph",
          figure={
              "data": geometry_tools.import_geometry([model_name]),
              "layout": plot_layout,
          },
          config={"scrollZoom": True}, # activates wheel thingy on mouse to zoom and wotnot
      )])
      
app = Dash()
app.layout = layout

app.run_server()

aegis1980 / dash-obj-in-3dmesh