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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