The "attribute test" of particle angle change.

[cgdvs]

HI，Tyson!

The "attribute test" of particle angle change.

If the particle rotates 90 degrees (or local coordinates) in the z-axis direction, how to test the output?

I tried "spin."_ I found "spin"_ Z "only tests the value, not the angle change. So how do we test the output "particle angle" change test?

thx

[tyFlow]

You can do this with the Script operator. I've attached a file showing how.

The key is to measure the dot product of your normalized vectors, then calculate the acos of that dot and then multiply by the radian-to-degree constant, to get the angle between them.

[cgdvs]

Thank you for your papers. I'll study hard. By the way, will this particle angle test be added to the property test operator in the future?

[tyFlow]

Perhaps at some point.

[cgdvs]

Thank you. I'm looking forward to it!