VRML Export Rotation/Offset Incorrect

[Mark Gifford]

Platform: Windows 7 x64, KiCAD build: kicad-2010-12-23-BZR2684_stable_branch-RC3b

If a footprint has a 3D model with non-zero offset or rotation specified, the exported board VRML will have incorrect rotation and offset values for that 3D model and they come out crooked. For instance, if a part has a 3D rotation of 90 degrees specified, the board VRML will rotate that part 9 degrees. 180 degrees specified results in an 18 degree rotation. It is off by a factor of ten for rotation. Possibly due to the code in lines 1060-1065 of export_vrml.cpp?? The offset is also incorrect. It appears that the 3D part offset is not applied to the VRML output at all. However, scaling works correctly....

To reproduce the problem:

Simply place a footprint and edit the 3d setting to apply a 90 degree rotation. Then export the VRML and view it in Blender or freeWrl viewer.

See attached picture for KiCAD 3D view (left) versus VRML Export (right)

[jean-pierre charras (jp-charras)]

Fix committed in testing branch

[Mark Gifford (splurt753)]

Almost perfect, but line 1091 need to be changed to this:

        int offsety = - wxRound( vrmlm->m_MatPosition.y * UNITS_3D_TO_PCB_UNITS ); // Y axis is reversed in pcbnew

(All I did was add a negative sign here)

I tested this locally and it works fine. Please update it in the testing branch. Thanks!!

[jean-pierre charras (jp-charras)]

Should be fixed now (even for flipped footprints).

[Mark Gifford (splurt753)]

Yep, that fixed it.

By the way, I also noticed that arc are drawn with an inverted x axis.... :(

I fixed it by changing the "startx + cos" to "startx - cos" in lines 509, 567, and 568

[jean-pierre charras (jp-charras)]

Le 20/01/2011 07:04, Mark Gifford a écrit :
> Yep, that fixed it.
>
> By the way, I also noticed that arc are drawn with an inverted x
> axis.... :(
>
> I fixed it by changing the "startx + cos" to "startx - cos" in lines
> 509, 567, and 568
>

Have you an sample(a footprint reference? )
I am unable to reproduce this issue.

--
Jean-Pierre CHARRAS

[Mark Gifford (splurt753)]

Yeah, just draw a simple arc on either the silkscreen or pcb edges layers and export a VRML (it may happen on other layers too?) Attached is a screenshot of how it comes out using the 2010-12-23 build.... Those corners are supposed to be rounded. Using Blender to view output...

[Robert (birmingham-spider)]

I've just hit this arc bug myself, the arc being on the edges layer.

Application: PCBnew
Version: (2011-01-22 BZR 2754)-stable
Build: wxWidgets 2.9.1 (wchar_t,compiler with C++ ABI 1002,GCC 4.4.0,wx containers,compatible with 2.8)
Platform: Windows XP (build 2600, Service Pack 3), 32 bit, Little endian, wxMSW

[Launchpad Janitor (janitor)]

[Expired for KiCad because there has been no activity for 60 days.]