Hi all,
I started with trying to solve ticket 5705, incorect ellipse reading
when extrusion is [0,0,-1].
As always the easiest solution was looked last, that is RTFM. If you
read dxf reference from autodesk you will see that everything is
explained very well. Not all entities use OCS (object coordinate
system, which is derived from extrusion vector). For ellipse its
clearly stated, excerpt:
---
Ellipse group codes
Group codes, Description
10 Center point (in WCS). DXF: X value; APP: 3D point
20, 30 DXF: Y and Z values of center point (in WCS)
11 Endpoint of major axis, relative to the center (in WCS).
21, 31 DXF: Y and Z values of endpoint of major axis, relative to the
center (in WCS)
---
Currently dxf driver blindly applies coordinate transformations to all
supported entities, which is incorrect.
Note that angles need to be corrected with respect to OCS (right hand
rule with counterclockwise direction).
RTFM, bye
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