> 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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