From c4dc1e079feac17dfecbbc7ef05f3bc215eeaa65 Mon Sep 17 00:00:00 2001
From: spatialfree <mail@ethanmerchant.com>
Date: Tue, 3 Dec 2024 02:04:21 -0500
Subject: [PATCH] gun hit test

---
 src/Arts.cs | 59 +++++++++++++++++++++++++++++++++++++++++++++++++----
 src/Mono.cs |  5 -----
 src/VFX.cs  |  6 +++---
 3 files changed, 58 insertions(+), 12 deletions(-)

diff --git a/src/Arts.cs b/src/Arts.cs
index ad96368..7940f1f 100644
--- a/src/Arts.cs
+++ b/src/Arts.cs
@@ -55,6 +55,7 @@ static class Arts
         Matrix m4_world = Mono.world_pose.ToMatrix();
         Hierarchy.Push(m4_world);
 
+        // mesh test
         meshes["Food"].Draw(
             mat_mono,
             Matrix.TRS(
@@ -64,6 +65,7 @@ static class Arts
             )
         );
 
+        // bamboo
         Mesh.Cube.Draw(
             mat_unlit,
             Matrix.TS(
@@ -73,19 +75,30 @@ static class Arts
             Color.Hex(0xB9E7AFFF)
         );
 
+        // unit cube
         Mesh.Cube.Draw(
             mat_unlit,
             Matrix.Identity,
             Color.Hex(0x13180AFF).ToLinear()
         );
 
+        // enemy
+        Vec3 enemy_pos = V.XYZ(SKMath.Sin(Time.Totalf * 1f) * 1.0f, 0.5f, -1.0f);
+        float enemy_rad = 0.5f;
+        Mesh.Sphere.Draw(
+            mat_unlit,
+            Matrix.TS(enemy_pos, enemy_rad * 2.0f),
+            Color.Hex(0x13180AFF).ToLinear()
+        );
+
+        // blade
         Mesh mesh = new();
-        Quat hand_rot = Quat.FromAngles(0, 0, SKMath.Sin(Time.Totalf * 6f) * 30f);
-        Vec3 hand_pos = V.XYZ(SKMath.Sin(Time.Totalf * 1f) * 0.1f, 0.5f, 1.0f);
-        Vec3 tip_pos = hand_pos + hand_rot * V.XYZ(0, 1, 0);
+        Quat blade_ori = Quat.FromAngles(0, 0, SKMath.Sin(Time.Totalf * 6f) * 30f);
+        Vec3 blade_pos = V.XYZ(SKMath.Sin(Time.Totalf * 1f) * 0.1f, 0.5f, 1.0f);
+        Vec3 tip_pos = blade_pos + blade_ori * V.XYZ(0, 1, 0);
         mesh.SetData(
             new Vertex[] {
-                new(    hand_pos, V.XYZ(0,0,1)),
+                new(    blade_pos, V.XYZ(0,0,1)),
                 new(     tip_pos, V.XYZ(0,0,1)),
                 new(last_tip_pos, V.XYZ(0,0,1))
             },
@@ -100,6 +113,44 @@ static class Arts
         );
         last_tip_pos = Vec3.Lerp(last_tip_pos, tip_pos, Time.Stepf / 0.1f);
 
+        // revolver
+        Quat rvolv_ori = Quat.Identity;
+        Vec3 rvolv_pos = V.XYZ(SKMath.Sin(Time.Totalf * 2f) * 0.6f, 0.5f, 0.5f);
+
+        Lines.Add(
+            rvolv_pos,
+            rvolv_pos + rvolv_ori * V.XYZ(0, 0, -10),
+            Color.Hex(0xF9BF05FF).ToLinear(),
+            U.cm
+        );
+
+        if (true) // hit test
+        {
+            Vec3 hit_delta = rvolv_ori.Inverse * (enemy_pos - rvolv_pos);
+            float flat_z = hit_delta.z;
+            hit_delta.z = 0;
+            float hit_mag = hit_delta.Magnitude;
+            bool hit = hit_mag < enemy_rad;
+            if (hit)
+            {
+                Log.Info("" + hit_mag);
+                float hit_dist = flat_z + (Maths.smooth_stop((enemy_rad - hit_mag) / enemy_rad) * enemy_rad);
+                Vec3 hit_pos = rvolv_pos + rvolv_ori * V.XYZ(0, 0, hit_dist);
+                Mesh.Sphere.Draw(
+                    mat_unlit,
+                    Matrix.TS(
+                        hit_pos,
+                        4 * U.cm
+                    ),
+                    Color.White
+                );
+                if (Rig.btn_select.delta == +1)
+                {
+                    VFX.Play(hit_pos);
+                }
+            }
+        }
+
         // particles
         Particle[] particles = VFX.particles;
         for (int i = 0; i < particles.Length; i++)
diff --git a/src/Mono.cs b/src/Mono.cs
index 847f9a8..ca6922c 100644
--- a/src/Mono.cs
+++ b/src/Mono.cs
@@ -64,11 +64,6 @@ static class Mono
                 // orbital_view
                 // box_pose.position = Input.Head.position + Input.Head.orientation * V.XYZ(0, -0 * U.cm, -10 * U.cm);
             }
-
-            if (Rig.btn_select.delta == +1)
-            {
-                VFX.Play(new XYZi(0, 1, 1));
-            }
         }
         else
         {
diff --git a/src/VFX.cs b/src/VFX.cs
index 5e65c8a..7c4771b 100644
--- a/src/VFX.cs
+++ b/src/VFX.cs
@@ -16,14 +16,14 @@ static class VFX
         }
     }
 
-    public static void Play(XYZi pos)
+    public static void Play(Vec3 pos)
     {
         for (int i = 0; i < 8; i++)
         {
             index = (index + 1) % particles.Length;
             Particle particle = particles[index];
-            particle.pos = pos.ToVec3;
-            particle.vel = Quat.FromAngles(Random.Shared.NextSingle() * 360, 0, 0) * Quat.FromAngles(0, Random.Shared.NextSingle() * 360, 0) * Vec3.Forward * 6.0f;
+            particle.pos = pos;
+            particle.vel = Quat.FromAngles(Random.Shared.NextSingle() * 360, 0, 0) * Quat.FromAngles(0, Random.Shared.NextSingle() * 360, 0) * Vec3.Forward * 1.0f;
             particle.ori = Quat.Identity;
             particle.scl = (1.0f / 3) * Maths.smooth_start(Random.Shared.NextSingle());
         }