resize and set different size of arrows about vispy HOT 2 OPEN

Because the data is 3D volume, I display it in several slices (Image). So I use a TurntableCamera camera.

from vispy.

1. Unfortunately, I don't think this is implemented and would need to be implemented in both the Python and shader code. The good news is it is probably something that can be copied from the MarkersVisual. The bad news is it might be annoyingly complicated because of the history of the MarkersVisual and handling of scaling (CC @brisvag).

2. Skimming the code I don't think there is anything stopping this from working in the shader code. It looks like it is mostly the python code that is limiting this. Do you get an error when you try passing an array? My guess is this part of the code isn't happy:

3. If I remember correctly the 3D support for the ArrowsVisual is very much a hack. I believe it was written only for 2D space, someone wanted to use it in 3D, so the shader code was naively/easily updated to just not drop the third axis. This doesn't necessarily mean that everything will look good which I think is what's happening in your image in your third point. I'm not sure what can be done about it, but I think there is another issue very similar to this (can't find it right now). My guess is that the calculations for the orientation of the arrow results in a divide by 0 in one of the dimensions and things just get weird after that. See:

from vispy.