Fix quadratic derivative

2018-12-21 11:34:10 -08:00 · 2018-12-21 11:34:10 -08:00 · 5442f81fea
parent 6ed839a14b
commit 5442f81fea
1 changed files with 1 additions and 1 deletions
--- a/utils/tile-svg/src/main.rs
+++ b/utils/tile-svg/src/main.rs
@ -1649,7 +1649,7 @@ impl SolveT for QuadraticAxis {
        lerp(lerp(self.from, self.ctrl, t), lerp(self.ctrl, self.to, t), t)
    }
    fn sample_deriv(&self, t: f32) -> f32 {
-        2.0 * (self.to - 2.0 * self.ctrl + self.from)
+        2.0 * lerp(self.ctrl - self.from, self.to - self.ctrl, t)
    }
 }