Discussion:
[kicad-users] Layout - some wrl files do not appear
dan-meeks@austin.rr.com [kicad-users]
2017-03-09 03:39:06 UTC
Permalink
When I assign a 3D model to a footprint, sometimes they show up and sometimes they don't. I can open the 3D model using FreeCad, and it looks just fine. But in the footprint editor, the 3D view just shows the PCB with no 3D model. I have tried scaling larger, just in case it came in at a very small size, but still nothing. It's happened several times. These are models that I d/l from the web, no idea what they were originally drawn with, but as I say I can import it in FreeCad and it looks just fine. Any ideas?
Thanks
dan-meeks@austin.rr.com [kicad-users]
2017-03-09 04:05:28 UTC
Permalink
Sorry - I think I may have figured this one out finally. I had to scale this one up by 450x and then it looks like the right size. That's probably been the issue all along. previously I tried scaling up by 10x and still didn't see anything, but until now I didn't try anything larger.
Cirilo Bernardo cirilo_bernardo@yahoo.com [kicad-users]
2017-03-09 07:53:54 UTC
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What version of kicad? The 4.x series has some severe limitations in parsing VRML files; many problems will simply disappear in 5.x.  Unfortunately it's not reasonable to back-port the 3D code from 5.x to 4.x, but on the bright side we might get 5.x in a few months.
VRML files on the net vary wildly. Some use m as the output unit as recommended in the VRML specification and must be magnified by 397, others use inches, some use mm, kicad uses 0.1inches for historical reasons, and so on.  KiCad 5.x will be able to use IGES and STEP models - since those models are intended for mechanical data exchange, they preserve the design units and simply appear the correct size in kicad.  If you want VRML models which are the correct size, the best tool to use is Maurice's StepUp tools which use FreeCAD to convert STEP models to VRML models which KiCad can use. (https://sourceforge.net/projects/kicadstepup/)
- Cirilo


From: "dan-***@austin.rr.com [kicad-users]" <kicad-***@yahoogroups.com>
To: kicad-***@yahoogroups.com
Sent: Thursday, March 9, 2017 2:39 PM
Subject: [kicad-users] Layout - some wrl files do not appear

  When I assign a 3D model to a footprint, sometimes they show up and sometimes they don't. I can open the 3D model using FreeCad, and it looks just fine. But in the footprint editor, the 3D view just shows the PCB with no 3D model. I have tried scaling larger, just in case it came in at a very small size, but still nothing. It's happened several times. These are models that I d/l from the web, no idea what they were originally drawn with, but as I say I can import it in FreeCad and it looks just fine. 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