Replaced the collision detection with a check of the angle

[hair] / src / hair.cc

diff --git a/src/hair.cc b/src/hair.cc
index b99d133..b2eb4a0 100644 (file)
--- a/src/hair.cc
+++ b/src/hair.cc
@@ -187,6 +187,19 @@ void Hair::update(float dt)
                hair[i].velocity += ((-hair[i].velocity * DAMPING) + accel) * dt;
                Vec3 new_pos = hair[i].pos + hair[i].velocity * dt;
 
+               /* collision detection with the head */
+               Vec3 normal = xform.upper3x3() * hair[i].spawn_dir;
+               Vec3 root = xform * hair[i].spawn_pt;
+               Vec3 dir = new_pos - root;
+               
+               normal.normalize();
+
+               /* angle that will cause the hair to be rendered inside the head */
+               float d = dot(dir, normal);
+               if(d < 0) {
+                       new_pos += -d * normal;
+               }
+
                hair[i].pos = handle_collision(new_pos);
 
                dbg_force = force;