Merge pull request simbleau#58 from Canleskis/perf-impr

Refactor force calculation
kotlin2018 · Aug 9, 2022 · f5feeab · f5feeab
2 parents 7ad9911 + 252226e
commit f5feeab
Showing 1 changed file with 4 additions and 7 deletions.
diff --git a/src/sim/physics.rs b/src/sim/physics.rs
@@ -57,17 +57,14 @@ impl PhysicsContext {
             let mut force = Vec2::ZERO;
             for other in &self.bodies {
                 if body != other {
-                    let sqr_dist = (other.position(self) - body.position(self))
-                        .length_squared();
-                    let force_dir = (other.position(self)
-                        - body.position(self))
-                    .normalize();
-                    force += force_dir
+                    let dir = other.position(self) - body.position(self);
+                    let sqr_dist = dir.length_squared();
+                    force += dir
                         * UNIVERSAL_GRAVITY
                         * GRAVITY_AMPLIFIER
                         * body.mass(self)
                         * other.mass(self)
-                        / sqr_dist;
+                        / (sqr_dist * sqr_dist.sqrt());
                 }
             }