Expose IsZero()

Post by **Major Cooke** » Thu Feb 22, 2018 1:32 pm

Because

if (!vel.IsZero() && Limbs.Size() > 0)

produces

Script error, "PSB.pk3:zs/player/playerfunc.txt" line 120:
Unknown function IsZero

AFADoomer · Post by **AFADoomer** » Thu Feb 22, 2018 3:27 pm

I haven't looked at the code, but, functionally, what's the difference between using !vel.IsZero() and vel.length() here?

Post by **Major Cooke** » Thu Feb 22, 2018 5:15 pm

Performs an unnecessary square root.

Post by **Graf Zahl** » Fri Feb 23, 2018 12:17 am

vel == (0,0,0) will do the job just fine.

Matt · Post by **Matt** » Sat Feb 24, 2018 2:15 am

why does IsZero() exist anyway?

Post by **_mental_** » Sat Feb 24, 2018 2:27 am

Just compare cost of inlined C++ function with cost of calling ZScript one in VM. In C++ the cost is zero but it's not in ZScript.

Post by **Graf Zahl** » Sat Feb 24, 2018 7:17 am

In C++ there are no vector literals so this function was more convenient.

ZDoom