Tower shots start at the tower top (arrow battlements, cannon muzzle, magic orb)

Effects now carry start/end heights; leftover 2D height offsets that moved
projectiles and hit sparks sideways on the map are removed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/render3d.rs

@@ -1099,11 +1099,7 @@ impl R3d {
 // ------------------------------------------------------------------ towers
 
 pub fn tower_height(t: &Tower) -> f32 {
-    match t.kind {
-        TowerKind::Arrow => 1.0 + 0.3 * (t.level - 1) as f32,
-        TowerKind::Cannon => 0.6 + 0.15 * (t.level - 1) as f32,
-        TowerKind::Magic => 1.2 + 0.3 * (t.level - 1) as f32,
-    }
+    t.top()
 }
 
 fn shade_c(r: u8, g: u8, b: u8, f: f32) -> Color {
@@ -1301,11 +1297,11 @@ fn draw_fx(f: &Fx, t: f32) {
     let p = (f.t / f.max).clamp(0.0, 1.0);
     let c = rgba(f.col);
     let a = |alpha: f32| Color::new(c.r, c.g, c.b, alpha);
-    let at = vec3(f.x, 0.4, f.y);
+    let at = vec3(f.x, f.h, f.y);
     match f.kind {
         0 => {
-            let from = vec3(f.x, 0.45, f.y);
-            let to = vec3(f.x2, 0.45, f.y2);
+            let from = vec3(f.x, f.h, f.y);
+            let to = vec3(f.x2, f.h2, f.y2);
             let head = from.lerp(to, p);
             let tail = from.lerp(to, (p - 0.35).max(0.0));
             line3(tail, head, 0.06, a(0.8));