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Won't Fix
Votes
1
Found in
2017.4.0f1
2018.3.0a1
2018.3.7f1
Issue ID
1134777
Regression
No
[2018.3][IL2CPP] Float to int conversion in returns incorrect value
Steps to reproduce:
1. Download attached project
2. Build a Standalone player with IL2CPP backend
Expected results: Angle variable is 45
Actual results: Angle variable is 44
Reproduced with: 2018.3.8f1, 2017.4.21f1
Not reproducible with: 2019.2.0a8, 2019.1.0b5
Example code:
Vector3 Direction = new Vector3(-3.0f, 0.0f, 3.0f);
float angleFloat = Vector3.SignedAngle(Direction, Vector3.forward, Vector3.up);
int angle = (int)angleFloat;
Workaround: for the float to int conversion use Convert.ToInt32()
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Resolution Note:
This is a precision error where IL2CPP calculates the SignedAngle to be 44.9999962 while Mono calculates it to be 45. Casting a float to int will truncate the value.
It is suggested that floats should always be rounded before casting, e.g. Mathf.Round(float), or use a dedicated function such as Convert.ToInt32().