[Interest] [Qt3D] Cylinder Mesh Mod Problem

[Sean Harmer]

Hi,

thanks for finding that. Are you able to push a fix to Qt's gerrit code 
review system please so that it can be reviewed and merged?

Many thanks,

Sean

On 25/01/2016 18:16, Andy wrote:
> > Subject: [Interest] [Qt3D] Cylinder Mesh Mod Problem
> > I am trying to work with and understand the Qt3D geometry and mesh 
> system.
> >
> > Based on Paul's answer to my earlier question I thought I'd start 
> with something simple: a cylinder without the end caps (QCylinderMesh 
> always includes them).
> >
> > I started by taking the QCylinderGeometry/QCylinderMesh code and 
> making it build outside of the Qt5 build system.  Next I removed the 
> code for adding the caps (called discs in the code).
> >
> > The cylinder looks good, but there seems to be an extra vert at 
> (0.0, 0.0, 0.0) and faces created between it and the top ring.  I 
> can't for the life of me figure out where the extra vert is coming 
> from or where those faces are created.
> >
> > I put some example code and a couple of images here:
> >
> > https://github.com/asmaloney/Qt3D-mesh-problem
> >
> > I am using the latest Qt 5.6 git from 22 Jan (SHA 
> 1fcdb6cafcf7621fdea84e28a95934a4a04ea1b7) which uses Qt3D from 21 Jan 
> (SHA 44c743c90cf51eddbf5b0bb3cf957c58fa0ef94f).
> >
> > Any ideas what I'm doing wrong or suggestions on how to figure it out?
> >
> > Thank you for any help/suggestions!
> >
> > - Andy
>
> I've discovered the problem.  There is a bug in QCylinderGeometry's 
> calculation of the cylinder's side indices.  You can see it if you 
> move the camera "inside" a cylinder.  I put an example image here:
>
> https://github.com/asmaloney/Qt3D-mesh-problem
>
> I fixed the example code in the repo.  Two small changes in 
> CylinderIndexDataFunctor::operator () and createSidesIndices() which 
> should be applied to Qt3D's QCylinderGeometry.
>
> - Andy
>
>
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-- 
Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
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