Feature: Enable Sketches object visible in web view

[amrit3701]

[amrit3701]

First solution

On investigation I found, OBJ support Line segment element. With this we can load sketch object to online viewer. However, current Arch ImportOBJ.py not exporting 2D objects, it only supports shapes which have faces.

I created below OBJ file manually, added a rectangle:

# FreeCAD v0.20 build2 Arch module
# http://www.freecadweb.org
mtllib sketch_drawing.mtl
o Extrude
usemtl color_cccccc
v 0.0 0.0 0.0
v 100.0 0.0 0.0
v 100.0 100.0 0.0
v 0.0 100.0 0.0
l 1 2 2 3 3 4 4 1

After adding support of line segments to 3D viewer, this is how above OBJ file looks like:

We need to update Arch ImportOBJ module code to support 2D objects.

For line segment, we simply add edge start and last vertexes to OBJ and then add l (line) element.

For Curves, first we need to find points on curve by discretize method, and then create line segments.

>>> pts = w.discretize(10)
>>> for i, j in zip(pts[:9], pts[1:]):
... 	Draft.makeLine(i, j)

With this we can load any type of 2D shape to 3D web viewer.

Second solution:

Extrude the 2D sketch object using Part Extrude feature. Set extrude face length to 0.1 um. So with naked eye it looks like line but in actual it's a face object.

http://ec2-54-234-132-150.compute-1.amazonaws.com:8080/share/64ba8baa7d037ab99acfa774

[sliptonic]

Pros and cons?
The second one seems like a work-around rather than doing it right

[amrit3701]

I am trying third party DXF loader. If it works, then FC lamdba will generate two file OBJ and DXF. OBJ for 3D shapes and DXF for 2D shape. Then in viewer will load both file on same scene.

https://github.com/gdsestimating/three-dxf

[amrit3701]

FC-worker PR: Ondsel-Development/FC-Worker#1

[amrit3701]

Ondsel-server PR: #83

[sliptonic]

Feature: Enable Sketches object visible in web view