Zero if normalize fail

physics.jai

@@ -27,6 +27,11 @@ normalize :: (v: Vector2) -> Vector2 #must {
     normalize(*v);
     return v;
 }
+normalize_or_zero :: inline (using _v: Vector2) -> Vector2 #must {
+    v := _v;
+    normalize_or_zero(*v);
+    return v;
+}
 negative :: (v: Vector2) -> Vector2 #must {
     return xy(-v.x, -v.y);
 }
@@ -111,8 +116,12 @@ apply_impulse_at_point :: (using r: *Rect, impulse: Vector2, point_world_space:
     {
     apply_force_at_point(r, impulse / TIMESTEP, point_world_space);
 } else {
-    vel += impulse / r.mass;
-    angle_vel += length(impulse) * (cross(point_world_space - pos, normalize(impulse))/moment_of_inertia(r));
+    if !static
+    {
+        vel += impulse / r.mass;
+        angle_vel += length(impulse) * (cross(point_world_space - pos, normalize_or_zero(impulse))/moment_of_inertia(r));
+        if isnan(angle_vel) Debug.breakpoint();
+    }
 }
 }
 // everything needed to resolve the collision
@@ -134,7 +143,6 @@ perp :: (v: Vector2) -> Vector2
 handle_collision :: (m: Manifold, dt: float) {
     a := m.a;
     b := m.b;
-    if m.count == 0 return;
     for 0..m.count-1
     {
         total_momentum: float = length(a.vel) * a.mass + length(b.vel) * b.mass;
@@ -142,6 +150,7 @@ handle_collision :: (m: Manifold, dt: float) {
         //impulse_strength += m.depths[it] * 3.0;
         impulse_strength += total_momentum / 2.0;
 
+        // the momentum would be unused if put into static
         if a.static || b.static impulse_strength *= 2.0;
 
         impulse := m.normal * impulse_strength;

tooling.ahk

@@ -8,9 +8,10 @@ SetWorkingDir, %A_ScriptDir%
 ^Esc::return 
 
 ^b::
-Runwait, build_physics.bat
 SetTitleMatchMode, 2
 WinActivate Visual
+Send, {Shift down}{F5}{Shift up}
+Runwait, build_physics.bat
 Sleep 100
 Send, {F5}
 Send, {Ctrl down}{Shift down}{F5}{Ctrl up}{Shift up}