Culling a custom primitive

CesiumJS
1

1. A concise explanation of the problem you’re experiencing.

I am trying to cull a custom primitive so that it doesn’t show when I rotate the globe. I know this has something to do with setting the bounding volume in the draw command, but I haven’t been able to get it to work.

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

Here is sandcastle example. It shows 2000 lines that are still visible when I rotate the globe.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

I need to make thousands of moving lines for a project to visualize wave data. I can’t just use polylines because it would be too slow and I need to animate them.

4. The Cesium version you’re using, your operating system and browser.

Cesium 1.50.0, Windows 10, Chrome

Thanks for you help

2

I also thought about calculating if the lines should show when I first set the vertices (Using the Occluder). But then I would have to update them every time the map moves so it would be too inefficient.

I still think the best way is to figure out how to get the primitive to cull the lines based on the bounding sphere of earth.

3

It looks like the cullface property works but only for triangles, not for lines. I think Cesium only supports culling for primitives made out of triangles. Does that seem correct?

Triangle example is culled:

Sandcastle

Lines are not:

Sandcastle