backface appears to not work

ParaView Support
1

I am trying to use backface removal in 5.13.1. It appears to not work. Is this user error, or an issue?

  • Pre 6.0.0 master, builtin server, Linux
  • can.exo. Apply
  • Wireframe
  • Advanced. Backface - Cull backface
  • Advanced. Set Backface opacity to 0.01.
    Neither of these seem to work. Should I write this up?
2

In the Wireframe representation, you are showing line segments only - there isn’t a frontface or backface as in the Surface representation because the faces aren’t being shown.

However, there is an option Hidden Line Removal that you can enable to get the effect I think you are looking for. Here’s an example:

image
image1878×1630 480 KB

vs. Wireframe with Hidden Line Removal off:

image
image1878×1630 193 KB

3

Perfect explanation. Thanks. My tutorials were wrong, I will update them when I am working in a few weeks.

4

I thought the backface with wireframe used to work. I thought the wireframe was draw by drawing the polygons with an edge-based rasterizer so front/back was still known.

Maybe the way we do wireframe is different. Maybe the support for this in OpenGL is gone. If this does not work, we should probably at least remove wireframe as an option for the backface representation.

5

What I remember is what you state. However, really what I am looking for was Hidden Line Removal.

I agree with Ken that if wireframe won’t work with backface, we should remove the option.