Add various examples both from raylib-cs and my own

Community/Models/RaylibCsExamples.Community.Core.Models.MeshPicking/Program.cs

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+using System.Numerics;
+using Raylib_cs;
+
+namespace RaylibCsExamples.Community.Models.AnimationDemo;
+
+public class MeshPicking
+{
+    public unsafe static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800*2;
+        const int screenHeight = 450*2;
+
+        Raylib.InitWindow(screenWidth, screenHeight, "raylib [models] example - mesh picking");
+
+        // Define the camera to look into our 3d world
+        var camera = new Camera3D
+        {
+            Position = new Vector3(20.0f, 20.0f, 20.0f),
+            Target = new Vector3(0.0f, 8.0f, 0.0f),
+            Up = new Vector3(0.0f, 1.6f, 0.0f),
+            FovY = 45.0f,
+            Projection = CameraProjection.Perspective
+        };
+
+        // Picking ray
+        Ray ray = new();
+
+        var tower = Raylib.LoadModel("Resources/Models/turret.obj");
+        var texture = Raylib.LoadTexture("Resources/Models/turret_diffuse.png");
+        Raylib.SetMaterialTexture(ref tower, 0, MaterialMapIndex.Albedo, ref texture);
+
+        tower.Transform = Raymath.MatrixTranslate(5.0f, 0.0f, 5.0f);
+        Vector3 towerPos = Vector3.Zero;
+        var towerBBox = Raylib.GetModelBoundingBox(tower);
+
+        // Ground quad
+        Vector3 g0 = new(-50.0f, 0.0f, -50.0f);
+        Vector3 g1 = new(-50.0f, 0.0f, 50.0f);
+        Vector3 g2 = new(50.0f, 0.0f, 50.0f);
+        Vector3 g3 = new(50.0f, 0.0f, -50.0f);
+
+        // Test triangle
+        Vector3 ta = new(-25.0f, 0.5f, 0.0f);
+        Vector3 tb = new(-4.0f, 2.5f, 1.0f);
+        Vector3 tc = new(-8.0f, 6.5f, 0.0f);
+
+        Vector3 bary = new(0.0f, 0.0f, 0.0f);
+
+        // Test sphere
+        Vector3 sp = new(-30.0f, 5.0f, 5.0f);
+        var sr = 4.0f;
+
+        Raylib.SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        //----------------------------------------------------------------------------------
+        // Main game loop
+        //--------------------------------------------------------------------------------------
+        while (!Raylib.WindowShouldClose())
+        {
+            //----------------------------------------------------------------------------------
+            // Update
+            //----------------------------------------------------------------------------------
+            if (Raylib.IsCursorHidden())
+            {
+                Raylib.UpdateCamera(ref camera, CameraMode.FirstPerson);
+            }
+
+            // Toggle camera controls
+            if (Raylib.IsMouseButtonPressed(MouseButton.Right))
+            {
+                if (Raylib.IsCursorHidden())
+                {
+                    Raylib.EnableCursor();
+                }
+                else
+                {
+                    Raylib.DisableCursor();
+                }
+            }
+
+            // Display information about closest hit
+            RayCollision collision = new();
+            var hitObjectName = "None";
+            collision.Distance = float.MaxValue;
+            collision.Hit = false;
+            var cursorColor = Color.White;
+
+            // Get ray and test against objects
+            ray = Raylib.GetScreenToWorldRay(Raylib.GetMousePosition(), camera);
+
+            // Check ray collision aginst ground quad
+            var groundHitInfo = Raylib.GetRayCollisionQuad(ray, g0, g1, g2, g3);
+            if (groundHitInfo.Hit && (groundHitInfo.Distance < collision.Distance))
+            {
+                collision = groundHitInfo;
+                cursorColor = Color.Green;
+                hitObjectName = "Ground";
+            }
+
+            // Check ray collision against test triangle
+            var triHitInfo = Raylib.GetRayCollisionTriangle(ray, ta, tb, tc);
+            if (triHitInfo.Hit && (triHitInfo.Distance < collision.Distance))
+            {
+                collision = triHitInfo;
+                cursorColor = Color.Purple;
+                hitObjectName = "Triangle";
+
+                bary = Raymath.Vector3Barycenter(collision.Point, ta, tb, tc);
+            }
+
+            // Check ray collision against test sphere
+            var sphereHitInfo = Raylib.GetRayCollisionSphere(ray, sp, sr);
+            if ((sphereHitInfo.Hit) && (sphereHitInfo.Distance < collision.Distance))
+            {
+                collision = sphereHitInfo;
+                cursorColor = Color.Orange;
+                hitObjectName = "Sphere";
+            }
+
+            // Check ray collision against bounding box first, before trying the full ray-mesh test
+            var boxHitInfo = Raylib.GetRayCollisionBox(ray, towerBBox);
+            if (boxHitInfo.Hit && boxHitInfo.Distance < collision.Distance)
+            {
+                collision = boxHitInfo;
+                cursorColor = Color.Orange;
+                hitObjectName = "Box";
+
+                // Check ray collision against model meshes
+                RayCollision meshHitInfo = new();
+                for (var m = 0; m < tower.MeshCount; m++)
+                {
+                    // NOTE: We consider the model.Transform for the collision check but
+                    // it can be checked against any transform matrix, used when checking against same
+                    // model drawn multiple times with multiple transforms
+                    meshHitInfo = Raylib.GetRayCollisionMesh(ray, tower.Meshes[m], tower.Transform);
+                    if (meshHitInfo.Hit)
+                    {
+                        // Save the closest hit mesh
+                        if ((!collision.Hit) || (collision.Distance > meshHitInfo.Distance))
+                        {
+                            collision = meshHitInfo;
+                        }
+                        break;
+                    }
+                }
+
+                if (meshHitInfo.Hit)
+                {
+                    collision = meshHitInfo;
+                    cursorColor = Color.Orange;
+                    hitObjectName = "Mesh";
+                }
+            }
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            Raylib.BeginDrawing();
+            Raylib.ClearBackground(Color.RayWhite);
+
+            Raylib.BeginMode3D(camera);
+
+            // Draw the tower
+            Raylib.DrawModel(tower, towerPos, 1.0f, Color.White);
+
+            // Draw the test triangle
+            Raylib.DrawLine3D(ta, tb, Color.Purple);
+            Raylib.DrawLine3D(tb, tc, Color.Purple);
+            Raylib.DrawLine3D(tc, ta, Color.Purple);
+
+            // Draw the test sphere
+            Raylib.DrawSphereWires(sp, sr, 8, 8, Color.Purple);
+
+            // Draw the mesh bbox if we hit it
+            if (boxHitInfo.Hit)
+            {
+                Raylib.DrawBoundingBox(towerBBox, Color.Lime);
+            }
+
+            // If we hit something, draw the cursor at the hit point
+            if (collision.Hit)
+            {
+                Raylib.DrawCube(collision.Point, 0.3f, 0.3f, 0.3f, cursorColor);
+                Raylib.DrawCubeWires(collision.Point, 0.3f, 0.3f, 0.3f, Color.Red);
+
+                var normalEnd = collision.Point + collision.Normal;
+                Raylib.DrawLine3D(collision.Point, normalEnd, Color.Red);
+            }
+
+            Raylib.DrawRay(ray, Color.Maroon);
+
+            Raylib.DrawGrid(10, 10.0f);
+
+            Raylib.EndMode3D();
+
+            // Draw some debug GUI text
+            Raylib.DrawText($"Hit Object: {hitObjectName}", 10, 50, 10, Color.Black);
+
+            if (collision.Hit)
+            {
+                var ypos = 70;
+
+                Raylib.DrawText($"Distance: {collision.Distance}", 10, ypos, 10, Color.Black);
+
+                Raylib.DrawText($"Hit Pos: {collision.Point}", 10, ypos + 15, 10, Color.Black);
+
+                Raylib.DrawText($"Hit Norm: {collision.Normal}", 10, ypos + 30, 10, Color.Black);
+
+                if (triHitInfo.Hit)
+                {
+                    Raylib.DrawText($"Barycenter: {bary}", 10, ypos + 45, 10, Color.Black);
+                }
+            }
+
+            Raylib.DrawText("Right click mouse to toggle camera controls", 10, 430, 10, Color.Gray);
+
+            Raylib.DrawText("(c) Turret 3D model by Alberto Cano", screenWidth - 200, screenHeight - 20, 10, Color.Gray);
+
+            Raylib.DrawFPS(10, 10);
+
+            Raylib.EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        Raylib.UnloadModel(tower);
+        Raylib.UnloadTexture(texture);
+
+        Raylib.CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}

Community/Models/RaylibCsExamples.Community.Core.Models.MeshPicking/RaylibCsExamples.Community.Core.Models.MeshPicking.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Include="..\..\resources\models\obj\turret.obj" Link="Resources\Models\turret.obj">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </Content>
+
+    <Content Include="..\..\resources\models\obj\turret_diffuse.png" Link="Resources\Models\turret_diffuse.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+</Project>