slash hit detection

readme.md

@@ -41,6 +41,29 @@ sdkmanager "platforms;android-33" "build-tools;33.0.0"
 
 ```
 todo
+  spawn enemies in line to player
+  slash with 4 sheathed swords
+    give the player a reason to slash in the different directions
+      swoop in from the different directions in an x
+    lft hand -> rht hip
+    rht hand -> lft hip
+    shoulders either
+  setup environment
+    mesh slopes as a base ground layer?
+  and groundwork for player movement/interactions
+  troubleshoot linux pc/vr stereokit
+
+  embedded blades
+    this helps with the gap in hit detection
+    as the slash part works great, but once the blade is deep within the enemy without the velocity to carry through
+    it could break off/get embedded in the enemy
+
+  stretch cursor is the gun?
+    stretch is the trigger
+    cursor  is the bullet
+    strength/sensitivity calculated on bullet hit
+    with force based movement relative cursor rather than rope swing (*temporary effect)
+
   pitch
     anime slasher with juicy dofs
 
@@ -52,10 +75,15 @@ todo
     stylized visuals
     fun to play daily for a couple weeks or so
 
+  design principles
+    defying gravity(dante style) > zero gravity || gravity
+
   core mechanics
     stretch slash
     revolver
       flick reload
+    joystick dash
+    grind on surfaces
     toylike level editor
       (no details to get bogged down with)
       shape environment

src/Arts.cs

@@ -86,14 +86,63 @@ static class Arts
         );
 
         // bamboo
-        Mesh.Cube.Draw(
-            mat_unlit,
-            Matrix.TS(
-                V.XYZ(0, 1, -5),
-                V.XYZ(0.1f, 2, 0.1f)
-            ),
-            Color.Hex(0xB9E7AFFF)
-        );
+        for (int i = -12; i <= 12; i++)
+        {
+            float z_offset = Noise.s_scalar_x(i) * 2.0f;
+            float x_offset = Noise.s_scalar_x(i + 32) * 0.2f;
+            float x_wind = Maths.smooth_stop(Maths.u_scalar(SKMath.Sin((i * 0.16f) - Time.Totalf)));
+            Vec3[] p = new Vec3[] {
+                V.XYZ(i * 0.3f, 0, -10 + z_offset),
+                V.XYZ(i * 0.3f, 1, -10 + z_offset),
+
+                V.XYZ(i * 0.3f, 4, -10 + z_offset),
+                V.XYZ(i * 0.3f + x_offset + x_wind, 5, -10 + z_offset),
+            };
+
+            // debug bezier points
+            // for (int i = 0; i < p.Length; i++)
+            // {
+            //     Mesh.Sphere.Draw(
+            //         mat_justcolor,
+            //         Matrix.TS(
+            //             p[i],
+            //             2 * U.mm
+            //         ),
+            //         Color.White
+            //     );
+            // }
+
+            // ground bump
+            // Mesh.Sphere.Draw(
+            //     mat_justcolor,
+            //     Matrix.TS(
+            //         box_mount,
+            //         3 * U.mm
+            //     ),
+            //     Color.Hex(0x959493FF).ToLinear()
+            // );
+
+            int steps = 92;
+            Vec3 pastPos = p[0];
+            float pastThc = 0.0f;
+            for (int j = 0; j < steps; j++)
+            {
+                float t = (float)j / (steps - 1);
+                Vec3 a = Vec3.Lerp(p[0], p[1], t);
+                Vec3 b = Vec3.Lerp(p[1], p[2], t);
+                Vec3 c = Vec3.Lerp(p[2], p[3], t);
+                Vec3 pos = Vec3.Lerp(Vec3.Lerp(a, b, t), Vec3.Lerp(b, c, t), t);
+                float thc = (1.0f + Maths.precision((1.0f - t), Maths.lerp(0.1f, 0.2f, Noise.u_scalar_x(i))) * 2.0f) * U.cm * 6.0f;
+                Lines.Add(
+                    pastPos,
+                    pos,
+                    thc != pastThc ? Color.Hex(0x959493FF).ToLinear() : Color.Hex(0xB9E7AFFF).ToLinear(),
+                    thc
+                );
+                pastPos = pos;
+                pastThc = thc;
+            }
+        }
 
         // unit cube
         // Mesh.Cube.Draw(
@@ -104,8 +153,9 @@ static class Arts
 
         // enemy
         Enemy enemy_test = Mono.enemy_types[(int)(Time.Totalf % Mono.enemy_types.Length)];
-        enemy_test.pose.position = V.XYZ(SKMath.Sin(Time.Totalf * 1f) * 1.0f, 0.666f, -3.0f);
-        enemy_test.pose.orientation = Quat.FromAngles(0, Time.Totalf * 30, 0);
+        Quat enemy_orbit = Quat.FromAngles(0, 0, 45) * Quat.FromAngles(0, (Time.Totalf * 30) % 360, 0);
+        enemy_test.pose.position = V.XYZ(0, 0, -3.0f) + enemy_orbit * V.XYZ(0, 0, -3);
+        // V.XYZ(SKMath.Sin(Time.Totalf * 1f) * 1.0f, 0.666f, -3.0f);
         for (int i = 0; i < enemy_test.cols.Count; i++)
         {
             Sphere col = enemy_test.cols[i];
@@ -130,7 +180,7 @@ static class Arts
         Mesh mesh = new();
         Quat blade_ori = Rig.r_hld.orientation;
         Vec3 blade_pos = Rig.r_hld.position;
-        Vec3 tip_pos = blade_pos + blade_ori * V.XYZ(0, 0, 1);
+        Vec3 tip_pos = blade_pos + blade_ori * V.XYZ(0, 0, -1);
         mesh.SetData(
             new Vertex[] {
                 new(    blade_pos, V.XYZ(0,0,1)),
@@ -146,8 +196,51 @@ static class Arts
             Matrix.Identity,
             Color.Hex(0xF9BF05FF).ToLinear()
         );
+        Ray slash_ray = new Ray(tip_pos, Vec3.Direction(tip_pos, last_tip_pos));
+        float ray_dist = Vec3.Distance(tip_pos, last_tip_pos);
         last_tip_pos = Vec3.Lerp(last_tip_pos, tip_pos, Time.Stepf / 0.1f);
 
+        if (true) // hit test
+        {
+            Matrix enemy_m4 = enemy_test.pose.ToMatrix();
+            Ray local_ray = enemy_m4.Inverse.Transform(slash_ray);
+            bool hit = false;
+            float min_dist = ray_dist;
+            Vec3 min_hit_pos = Vec3.Zero;
+            for (int i = 0; i < enemy_test.cols.Count; i++)
+            {
+                Sphere col = enemy_test.cols[i];
+                Vec3 hit_pos = Vec3.Zero;
+                if (col.Intersect(local_ray, out hit_pos))
+                {
+                    float hit_dist = Vec3.Distance(hit_pos, local_ray.position);
+                    if (hit_dist < min_dist)
+                    {
+                        hit = true;
+                        min_dist = hit_dist;
+                        min_hit_pos = hit_pos;
+                    }
+                }
+            }
+            min_hit_pos = enemy_m4.Transform(min_hit_pos);
+
+            if (hit)
+            {
+                Mesh.Sphere.Draw(
+                    mat_unlit,
+                    Matrix.TS(
+                        min_hit_pos,
+                        4 * U.cm
+                    ),
+                    Color.White
+                );
+                if (Rig.btn_select.state)
+                {
+                    VFX.Play(min_hit_pos);
+                }
+            }
+        }
+
         // revolver
         Quat rvolv_ori = Rig.l_aim.orientation;
         Vec3 rvolv_pos = Rig.l_aim.position;
@@ -209,7 +302,7 @@ static class Arts
         for (int i = 0; i < particles.Length; i++)
         {
             Particle particle = particles[i];
-            Mesh.Cube.Draw(
+            Mesh.Sphere.Draw(
                 mat_unlit,
                 Matrix.TRS(
                     particle.pos,

src/Maths.cs

@@ -35,7 +35,10 @@ public static class Maths
     // public static int roundi(float value) => MathF.Round(value)
 
     public static float precision(float x, float p)
-        => round(x * p) / p;
+    {
+        float ps = p < 1.0f ? 1 / p : p;
+        return round(x * ps) / ps;
+    }
 
     public static float smooth_start(float t) => (t * t * t);
     public static float smooth_stop(float t)
@@ -94,6 +97,122 @@ public static class Maths
     }
 }
 
+/// <summary>
+/// SquirrelNoise5 - Squirrel's Raw Noise utilities (version 5)
+/// Converted to C# from original C++ implementation by Squirrel Eiserloh
+/// </summary>
+public static class Noise
+{
+    // Bit noise constants
+    private const uint SQ5_BIT_NOISE1 = 0xd2a80a3f;
+    private const uint SQ5_BIT_NOISE2 = 0xa884f197;
+    private const uint SQ5_BIT_NOISE3 = 0x6C736F4B;
+    private const uint SQ5_BIT_NOISE4 = 0xB79F3ABB;
+    private const uint SQ5_BIT_NOISE5 = 0x1b56c4f5;
+
+    // Constants for higher dimensional noise
+    private const int PRIME1 = 198491317;
+    private const int PRIME2 = 6542989;
+    private const int PRIME3 = 357239;
+
+    /// <summary>
+    /// Fast hash of an int32 into a different (unrecognizable) uint32
+    /// </summary>
+    private static uint GetNoise(int positionX, uint seed)
+    {
+        uint mangledBits = (uint)positionX;
+        mangledBits *= SQ5_BIT_NOISE1;
+        mangledBits += seed;
+        mangledBits ^= (mangledBits >> 9);
+        mangledBits += SQ5_BIT_NOISE2;
+        mangledBits ^= (mangledBits >> 11);
+        mangledBits *= SQ5_BIT_NOISE3;
+        mangledBits ^= (mangledBits >> 13);
+        mangledBits += SQ5_BIT_NOISE4;
+        mangledBits ^= (mangledBits >> 15);
+        mangledBits *= SQ5_BIT_NOISE5;
+        mangledBits ^= (mangledBits >> 17);
+        return mangledBits;
+    }
+
+    // 1D Noise Functions
+    public static uint u_int_x(int x, uint seed = 0)
+    {
+        return GetNoise(x, seed);
+    }
+
+    public static float u_scalar_x(int x, uint seed = 0)
+    {
+        return (float)(GetNoise(x, seed) / (double)uint.MaxValue);
+    }
+
+    public static float s_scalar_x(int x, uint seed = 0)
+    {
+        return (float)((int)GetNoise(x, seed) / (double)int.MaxValue);
+    }
+
+    private static int step;
+    static int stepper
+    {
+        get
+        {
+            step = (step + 1) % 100_000; // [!] magic number
+            return step;
+        }
+    }
+    public static uint u_int => u_int_x(stepper);
+    public static float u_scalar => u_scalar_x(stepper);
+    public static float s_scalar => s_scalar_x(stepper);
+
+    // // 2D Noise Functions
+    // public static uint Get2dNoiseUint(int indexX, int indexY, uint seed = 0)
+    // {
+    //     return GetNoise(indexX + (PRIME1 * indexY), seed);
+    // }
+
+    // public static float Get2dNoiseZeroToOne(int indexX, int indexY, uint seed = 0)
+    // {
+    //     return (float)(Get2dNoiseUint(indexX, indexY, seed) / (double)uint.MaxValue);
+    // }
+
+    // public static float Get2dNoiseNegOneToOne(int indexX, int indexY, uint seed = 0)
+    // {
+    //     return (float)((int)Get2dNoiseUint(indexX, indexY, seed) / (double)int.MaxValue);
+    // }
+
+    // 3D Noise Functions
+    public static uint u_int_xyz(int x, int y, int z, uint seed = 0)
+    {
+        return GetNoise(x + (PRIME1 * y) + (PRIME2 * z), seed);
+    }
+
+    public static float u_scalar_xyz(int x, int y, int z, uint seed = 0)
+    {
+        return (float)(u_int_xyz(x, y, z, seed) / (double)uint.MaxValue);
+    }
+
+    public static float s_scalar_xyz(int x, int y, int z, uint seed = 0)
+    {
+        return (float)((int)u_int_xyz(x, y, z, seed) / (double)int.MaxValue);
+    }
+
+    // // 4D Noise Functions
+    // public static uint Get4dNoiseUint(int indexX, int indexY, int indexZ, int indexT, uint seed = 0)
+    // {
+    //     return GetNoise(indexX + (PRIME1 * indexY) + (PRIME2 * indexZ) + (PRIME3 * indexT), seed);
+    // }
+
+    // public static float Get4dNoiseZeroToOne(int indexX, int indexY, int indexZ, int indexT, uint seed = 0)
+    // {
+    //     return (float)(Get4dNoiseUint(indexX, indexY, indexZ, indexT, seed) / (double)uint.MaxValue);
+    // }
+
+    // public static float Get4dNoiseNegOneToOne(int indexX, int indexY, int indexZ, int indexT, uint seed = 0)
+    // {
+    //     return (float)((int)Get4dNoiseUint(indexX, indexY, indexZ, indexT, seed) / (double)int.MaxValue);
+    // }
+}
+
 public class DeltaBool
 {
     public int delta = 0;

src/Program.cs

@@ -22,6 +22,7 @@ class Program
             disableFlatscreenMRSim = true,
             renderScaling = 2,
             renderMultisample = 0,
+            // mode = AppMode.Simulator,
         };
 
         if (!SK.Initialize(settings))

src/Rig.cs

@@ -33,11 +33,11 @@ static class Rig
             btn_back.Step(Input.Key(Key.MouseRight).IsActive());
 
             r_hld = new Pose(
-                V.XYZ(SKMath.Sin(Time.Totalf * 1f) * 0.1f, 0.5f, 1.0f),
-                Quat.FromAngles(0, 0, SKMath.Sin(Time.Totalf * 6f) * 30f)
+                V.XYZ(SKMath.Sin(Time.Totalf * 6f) * 0.6f * 0.0f, 0.5f, 1.0f),
+                Quat.FromAngles(0, 0, 45) * Quat.FromAngles(0, SKMath.Sin(Time.Totalf * 6f) * 60f, 0)
             );
             l_aim = new Pose(
-                V.XYZ(SKMath.Sin(Time.Totalf * 2f) * 0.6f, 0.5f, 0.5f),
+                V.XYZ(1.0f, 0.5f, 0.5f), // V.XYZ(SKMath.Sin(Time.Totalf * 2f) * 0.6f, 0.5f, 0.5f),
                 Quat.Identity
             );
 

src/VFX.cs

@@ -23,9 +23,9 @@ static class VFX
             index = (index + 1) % particles.Length;
             Particle particle = particles[index];
             particle.pos = pos;
-            particle.vel = Quat.FromAngles(Random.Shared.NextSingle() * 360, 0, 0) * Quat.FromAngles(0, Random.Shared.NextSingle() * 360, 0) * Vec3.Forward * 6.0f;
+            particle.vel = Quat.FromAngles(Noise.u_scalar * 360, 0, 0) * Quat.FromAngles(0, Noise.u_scalar * 360, 0) * Vec3.Forward * 3.0f;
             particle.ori = Quat.Identity;
-            particle.scl = (1.0f / 3) * Maths.smooth_start(Random.Shared.NextSingle());
+            particle.scl = (1.0f / 3) * Maths.smooth_start(Noise.u_scalar);
         }
     }