Added normal textures

TheRepo/TheLabs/Helpers.cs

@@ -0,0 +1,67 @@
+using OpenTK.Mathematics;
+
+namespace TheLabs;
+
+public static class Helpers
+{
+    public static void CalculateTangent(ref Vertex v1, ref Vertex v2, ref Vertex v3)
+    {
+        // 1. Calculate Edge Vectors (Geometry)
+        Vector3 edge1 = v2.Position - v1.Position;
+        Vector3 edge2 = v3.Position - v1.Position;
+
+        // 2. Calculate Edge Vectors (Texture Space)
+        Vector2 deltaUV1 = v2.TexCoords - v1.TexCoords;
+        Vector2 deltaUV2 = v3.TexCoords - v1.TexCoords;
+
+        // 3. The Math (Solving linear equations)
+        float f = 1.0f / (deltaUV1.X * deltaUV2.Y - deltaUV2.X * deltaUV1.Y);
+
+        Vector3 tangent;
+        tangent.X = f * (deltaUV2.Y * edge1.X - deltaUV1.Y * edge2.X);
+        tangent.Y = f * (deltaUV2.Y * edge1.Y - deltaUV1.Y * edge2.Y);
+        tangent.Z = f * (deltaUV2.Y * edge1.Z - deltaUV1.Y * edge2.Z);
+
+        // Normalize it
+        tangent = Vector3.Normalize(tangent);
+        Vector3 bitangent = Vector3.Normalize(Vector3.Cross(edge1, edge2));
+
+        // 4. Assign the same tangent to all 3 vertices of the triangle
+        // (For smooth objects, you would average them, but for a cube, this is fine)
+        v1.Tangent = tangent; v1.Bitangent = bitangent;
+        v2.Tangent = tangent; v2.Bitangent = bitangent;
+        v3.Tangent = tangent; v3.Bitangent = bitangent;
+    }
+
+    public static void AddFace(List<Vertex> vertices, List<uint> indices,
+        Vertex v0, Vertex v1, Vertex v2, Vertex v3)
+    {
+        // 1. Calculate Tangents
+        // We calculate it twice to ensure the tangent is consistent across the whole face
+        // Triangle 1 (Bottom-Left, Bottom-Right, Top-Right)
+        CalculateTangent(ref v0, ref v1, ref v2);
+        // Triangle 2 (Bottom-Left, Top-Right, Top-Left)
+        CalculateTangent(ref v0, ref v2, ref v3);
+
+        // 2. Track where these new vertices start in the main list
+        // (If the list has 4 items, the new ones start at index 4)
+        uint offset = (uint)vertices.Count;
+
+        // 3. Add Vertices to the list
+        vertices.Add(v0); // Index: offset + 0
+        vertices.Add(v1); // Index: offset + 1
+        vertices.Add(v2); // Index: offset + 2
+        vertices.Add(v3); // Index: offset + 3
+
+        // 4. Add Indices for the two triangles (Standard Quad)
+        // Triangle 1
+        indices.Add(offset + 0);
+        indices.Add(offset + 1);
+        indices.Add(offset + 2);
+
+        // Triangle 2
+        indices.Add(offset + 0);
+        indices.Add(offset + 2);
+        indices.Add(offset + 3);
+    }
+}

TheRepo/TheLabs/Lighting.cs

@@ -11,12 +11,21 @@ public struct Lighting
     public Vector3 diffuseColour;
     public Vector3 specularColour;
     
+    public float constant;
+    public float linear;
+    public float quadratic;
+    
     public Lighting(Vector3 pos, Vector3 ambient, Vector3 diffuse, Vector3 specular)
     {
         position = pos;
         ambientColour = ambient;
         diffuseColour = diffuse;
         specularColour = specular;
+        
+        constant = 1.0f;
+        linear = 0.09f;
+        quadratic = 0.032f;
+        
     }
     
     public void Apply(Shader shader)
@@ -25,5 +34,10 @@ public struct Lighting
         GL.Uniform3(GL.GetUniformLocation(shader.Handle, "uPointLight.ambientColour"), ref ambientColour);
         GL.Uniform3(GL.GetUniformLocation(shader.Handle, "uPointLight.diffuseColour"), ref diffuseColour);
         GL.Uniform3(GL.GetUniformLocation(shader.Handle, "uPointLight.specularColour"), ref specularColour);
+        
+        GL.Uniform1(GL.GetUniformLocation(shader.Handle, "uPointLight.constant"), constant);
+        GL.Uniform1(GL.GetUniformLocation(shader.Handle, "uPointLight.linear"), linear);
+        GL.Uniform1(GL.GetUniformLocation(shader.Handle, "uPointLight.quadratic"), quadratic);
+    
     }
 }

TheRepo/TheLabs/Mesh.cs

@@ -12,7 +12,7 @@ public class Mesh : IDisposable
     private readonly int _vertexCount;
     private readonly bool _useIndices;
 
-    public enum VertexLayout { PosColor, PosTex, PosTexNormal }
+    public enum VertexLayout { PosColor, PosTex, PosTexNormal, PosTexNormalTangent }
 
     public Mesh(float[] vertices, uint[] indices, VertexLayout layout)
     {
@@ -65,7 +65,7 @@ public class Mesh : IDisposable
         if (layout == VertexLayout.PosColor)
         {
             // Stride = 7 floats (3 Pos + 4 Color)
-            var stride = 7 * sizeof(float); 
+            var stride = 14 * sizeof(float); 
             
             // Location 0: Position
             GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
@@ -77,6 +77,13 @@ public class Mesh : IDisposable
             
             GL.VertexAttribPointer(2, 2, VertexAttribPointerType.Float, false, stride, 3 * sizeof(float));
             GL.EnableVertexAttribArray(2);
+            
+            GL.VertexAttribPointer(3, 3, VertexAttribPointerType.Float, false, stride, 8 * sizeof(float));
+            GL.EnableVertexAttribArray(3);
+            
+            // Loc 4: Bitangent (Offset 11) <-- NEW
+            GL.VertexAttribPointer(4, 3, VertexAttribPointerType.Float, false, stride, 11 * sizeof(float));
+            GL.EnableVertexAttribArray(4);
         }
         else if (layout == VertexLayout.PosTex)
         {
@@ -96,7 +103,7 @@ public class Mesh : IDisposable
         else if (layout == VertexLayout.PosTexNormal)
         {
             // Stride = 8 floats (3 Pos + 3 Normal + 2 Tex)
-            var stride = 8 * sizeof(float);
+            var stride = 14 * sizeof(float);
 
             // Location 0: Position
             GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
@@ -109,6 +116,32 @@ public class Mesh : IDisposable
             // Location 2: TexCoord (Offset 6 floats: 3 pos + 3 normal)
             GL.VertexAttribPointer(2, 2, VertexAttribPointerType.Float, false, stride, 6 * sizeof(float));
             GL.EnableVertexAttribArray(2);
+            
+        }
+        else if (layout == VertexLayout.PosTexNormalTangent)
+        {
+            // --- NEW LOGIC FOR CUBES (Stride 14) ---
+            var stride = 14 * sizeof(float);
+
+            // Loc 0: Position
+            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
+            GL.EnableVertexAttribArray(0);
+
+            // Loc 1: Normal
+            GL.VertexAttribPointer(1, 3, VertexAttribPointerType.Float, false, stride, 3 * sizeof(float));
+            GL.EnableVertexAttribArray(1);
+
+            // Loc 2: TexCoord
+            GL.VertexAttribPointer(2, 2, VertexAttribPointerType.Float, false, stride, 6 * sizeof(float));
+            GL.EnableVertexAttribArray(2);
+            
+            // Loc 3: Tangent
+            GL.VertexAttribPointer(3, 3, VertexAttribPointerType.Float, false, stride, 8 * sizeof(float));
+            GL.EnableVertexAttribArray(3);
+
+            // Loc 4: Bitangent
+            GL.VertexAttribPointer(4, 3, VertexAttribPointerType.Float, false, stride, 11 * sizeof(float));
+            GL.EnableVertexAttribArray(4);
         }
     }
 

TheRepo/TheLabs/MyExampleWindow.cs

@@ -58,8 +58,9 @@ namespace TheLabs
             base.OnLoad();
             
             // --- Set up Lighting and Material ---
-            _mainLight = new Lighting(new Vector3(1.2f, 1.0f, 2.0f),
-                new Vector3(0.3f),
+            _mainLight = new Lighting(new Vector3(
+                    1.2f, 1.0f, 2.0f),
+                new Vector3(0.5f),
                 new Vector3(1.5f),
                 new Vector3(1.0f));
             
@@ -78,14 +79,17 @@ namespace TheLabs
             
             // -- Load Shaders, Textures, and Create Scene Objects ---
             _shader = new Shader("Shaders/shader.vert", "Shaders/shader.frag");
-            _texture = new Texture("Textures/placeholder.png");
+            _texture = new Texture("Textures/cobble.jpg");
+            Texture _normalMap = new Texture("Textures/cobbleNormal.jpg");
+            
             
             // --- Create Scene Graph ---
             _rootNode = new SceneNode();
             
             // Create Example Object
-            _buildingObject = ShapeFactory.CreateTexturedSphere();
+            _buildingObject = ShapeFactory.CreateTexturedCube();
             _buildingRender = new RenderObject(_buildingObject, _shader, _texture, _defaultMaterial, _mainLight);
+            _buildingRender.NormalMap = _normalMap;
             _buildingNode = new SceneNode(_buildingRender);
             _buildingNode.Position = new Vector3(2.0f, -1.0f, 0.0f);
             _buildingNode.Scale = new Vector3(0.1f, 0.1f, 0.1f);

TheRepo/TheLabs/RenderObject.cs

@@ -9,6 +9,7 @@ public class RenderObject
     public Mesh Mesh;
     public Shader Shader;
     public Texture Texture; 
+    public Texture NormalMap;
     public Material Material;
     public Lighting Lighting;
     
@@ -16,6 +17,7 @@ public class RenderObject
     public Matrix4 Transform = Matrix4.Identity;
     public Quaternion Rotation = Quaternion.Identity;
     public Vector3 Scale = Vector3.One;
+    public bool UseTexture = true;
 
     public RenderObject(Mesh mesh, Shader shader, Texture texture, Material material, Lighting lighting)
     {
@@ -38,8 +40,27 @@ public class RenderObject
         Material mat = new Material(pink * 0.1f, pink * 0.6f, Vector3.One, 32.0f);
         
         Shader.Use();
-        Texture.Use();
+        if (Texture != null && UseTexture)
+        {
+            Texture.Use(TextureUnit.Texture0);
             Shader.SetInt("uTexture", 0);
+            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseTexture"), 1);
+        }
+        else
+        {
+            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseTexture"), 0);
+        }
+
+        if (NormalMap != null)
+        {
+            NormalMap.Use(TextureUnit.Texture1);
+            Shader.SetInt("uNormalMap", 1);
+            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseNormalMap"), 1);
+        }
+        else
+        {
+            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseNormalMap"), 0);
+        }
         
         Material.Apply(Shader);
         light.Apply(Shader);

TheRepo/TheLabs/Shaders/shader.frag

@@ -9,6 +9,7 @@ out vec4 outputColor; // The final output color of the fragment
 in vec3 FragPos;
 in vec3 Normal;
 in vec2 TexCoord;
+in mat3 vTBN; // Tangent, Bitangent, Normal matrix
 
 struct MaterialProperty {
     vec3 ambientColour;
@@ -22,60 +23,75 @@ struct LightProperty {
     vec3 ambientColour;
     vec3 diffuseColour;
     vec3 specularColour;
+    
+    float constant;
+    float linear;
+    float quadratic;
 };
 
 // --- UNIFORMS ---
 uniform sampler2D uTexture; // Image Texture
+uniform sampler2D uNormalMap; // Normal Map Texture
 uniform vec3 uViewPos; // Camera Position
 uniform MaterialProperty uMaterial; // Material Properties
 uniform LightProperty uPointLight; // Light Properties
+uniform int uUseTexture; // Flag to indicate if texture should be used
+uniform int uUseNormalMap; // Flag to indicate if normal map should be used
 
 
+vec3 CalcPointLight(LightProperty light, vec3 normal, vec3 fragPos, vec3 viewDir) {
+    vec3 lightDir = normalize(light.position - fragPos);
+
+    // 1. Diffuse shading
+    float diff = max(dot(normal, lightDir), 0.0);
+
+    // 2. Specular shading
+    vec3 reflectDir = reflect(-lightDir, normal);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), uMaterial.shininess);
+
+    // 3. Attenuation
+    float distance    = length(light.position - fragPos);
+    float attenuation = 1.0 / (light.constant + light.linear * distance +
+    light.quadratic * (distance * distance));
+
+    // 4. Combine results
+    vec3 ambient  = light.ambientColour  * uMaterial.ambientColour;
+    vec3 diffuse  = light.diffuseColour  * diff * uMaterial.diffuseColour;
+    vec3 specular = light.specularColour * spec * uMaterial.specularColour;
+
+    ambient  *= attenuation;
+    diffuse  *= attenuation;
+    specular *= attenuation;
+
+    return (ambient + diffuse + specular);
+    
+}
+
 void main()
 {
-    // --- LIGHTING CALCULATIONS ---
-    // Lighting Setup (hardcoded for simplicity)
-    vec3 lightPos = vec3(1.2f, 1.0f, 2.0f);
-    vec3 lightColor = vec3(1.0f, 1.0f, 1.0f);
+    vec3 norm;
     
-    // 1. Get Texture Color
-    // Sample the texture at the given texture coordinates
-    vec4 objColor = texture(uTexture, TexCoord);
+    if (uUseNormalMap == 1) {
+        vec3 normalFromTexture = texture(uNormalMap, TexCoord).rgb;
+        vec3 colourShift = normalFromTexture * 2.0 - 1.0; // Transform from [0,1] to [-1,1]
+        // 1. Setup Vectors
+        norm = normalize(vTBN * colourShift);
+        
+    } else {
+        norm = normalize(Normal);
+    }
+
+    vec3 viewDir = normalize(uViewPos - FragPos);
+
+    // 2. Calculate Lighting using the Function
+    vec3 result = CalcPointLight(uPointLight, norm, FragPos, viewDir);
+
+    // 3. Apply Texture Switch
+    if (uUseTexture == 1) {
+
+        outputColor = vec4(result, 1.0) * texture(uTexture, TexCoord);
+    } else {
+        outputColor = vec4(result, 1.0);
+    }
     
-    // 2. Ambient strength
-    // A constant, dim light that ensure s object are not completely dark
-    // It simply multiplies the light color by a small factor
-    float ambientStrength = 0.1f;
-    vec3 ambient = uMaterial.ambientColour * uPointLight.ambientColour;
-
-    // 3. Diffuse
-    // Creates the "matte" effect by calculating the angle between the light direction and the surface normal
-    
-    // Normalize the normal vector and calculate the light direction
-    vec3 norm = normalize(Normal);
-    vec3 lightDir = normalize(uPointLight.position - FragPos);
-    
-    // The dot product gives us the cosine of the angle between the two vectors
-    // The max function ensures we don't get negative values (light coming from behind the surface)
-    float diff = max(dot(norm, lightDir), 0.0f);
-    vec3 diffuse = (uPointLight.diffuseColour * diff) * uMaterial.diffuseColour;
-
-    // 4. Specular
-    // Creates the shiny highlights on the surface
-    float shininess = 32.0f;
-    // Calculate the view direction and the reflection direction
-    vec3 viewDirection = normalize(uViewPos - FragPos);
-    // If the light is coming from the light direction, we need to negate it for reflection
-    vec3 reflectDirection = reflect(-lightDir, normalize(Normal));
-    
-    // Calculate the specular component using the dot product and shininess factor
-    float spec = pow(max(dot(viewDirection, reflectDirection), 0.0f), shininess);
-    vec3 specular = uMaterial.specularColour * spec * uPointLight.specularColour;
-
-    // 5. Combine
-    // We multiply (Ambient + Diffuse) by the Texture Color.
-    // We ADD Specular afterwards so the highlights look bright white (like plastic/metal).
-    vec3 result = (ambient + diffuse) * objColor.rgb + specular;
-
-    outputColor = vec4(result, objColor.a);
 }

TheRepo/TheLabs/Shaders/shader.vert

@@ -7,12 +7,15 @@
 layout(location = 0) in vec3 aPosition; // Raw 3D position
 layout(location = 1) in vec3 aNormal; // The direction perpendicular to the surface
 layout(location = 2) in vec2 aTexCoord; // The U,V texture coordinates
+layout(location = 3) in vec3 aTangent; // Tangent vector for normal mapping
+layout(location = 4) in vec3 aBitangent; // Bitangent vector for normal mapping
 
 // --- OUTPUTS ---
 // We can pass data to the fragment shader through these
 out vec3 FragPos;
 out vec3 Normal;
 out vec2 TexCoord;
+out mat3 vTBN;
 
 // --- UNIFORMS ---
 // These are matrices that help transform our vertices
@@ -22,6 +25,12 @@ uniform mat4 projection;
 
 void main(void)
 {
+    vec3 T = normalize(vec3(model * vec4(aTangent, 0.0)));
+    vec3 B = normalize(vec3(model * vec4(aBitangent, 0.0)));
+    vec3 N = normalize(vec3(model * vec4(aNormal, 0.0)));
+    
+    vTBN = mat3(T, B, N);
+    
     // 1. Calculate World Position
     FragPos = vec3(model * vec4(aPosition, 1.0));
 

TheRepo/TheLabs/ShapeFactory.cs

@@ -1,72 +1,83 @@
-namespace TheLabs;
+using OpenTK.Mathematics;
+
+namespace TheLabs;
 
 public static class ShapeFactory
 {
     public static Mesh CreateTexturedCube()
     {
-        float[] vertices = {
-            // Format:  X,     Y,     Z,      NX, NY, NZ,     U,  V
+        List<Vertex> vertices = new List<Vertex>();
+        List<uint> indices = new List<uint>();
         
-            // --- Front Face (Normal points +Z: 0, 0, 1) ---
-            -0.5f, -0.5f,  0.5f,   0f, 0f, 1f,    0f, 0f, // Bottom-left
-            0.5f, -0.5f,  0.5f,   0f, 0f, 1f,    1f, 0f, // Bottom-right
-            0.5f,  0.5f,  0.5f,   0f, 0f, 1f,    1f, 1f, // Top-right
-            -0.5f,  0.5f,  0.5f,   0f, 0f, 1f,    0f, 1f, // Top-left
+        // --- FRONT FACE (Normal 0, 0, 1) ---
+    // Sequence: Bottom-Left -> Bottom-Right -> Top-Right -> Top-Left
+    Helpers.AddFace(vertices, indices,
+        new Vertex(new Vector3(-0.5f, -0.5f,  0.5f), new Vector3(0, 0, 1), new Vector2(0, 0), Vector3.Zero, Vector3.Zero), // BL
+        new Vertex(new Vector3( 0.5f, -0.5f,  0.5f), new Vector3(0, 0, 1), new Vector2(1, 0), Vector3.Zero, Vector3.Zero), // BR
+        new Vertex(new Vector3( 0.5f,  0.5f,  0.5f), new Vector3(0, 0, 1), new Vector2(1, 1), Vector3.Zero, Vector3.Zero), // TR
+        new Vertex(new Vector3(-0.5f,  0.5f,  0.5f), new Vector3(0, 0, 1), new Vector2(0, 1), Vector3.Zero, Vector3.Zero)  // TL
+    );
 
-            // --- Back Face (Normal points -Z: 0, 0, -1) ---
-            -0.5f, -0.5f, -0.5f,   0f, 0f, -1f,   1f, 0f, 
-            0.5f, -0.5f, -0.5f,   0f, 0f, -1f,   0f, 0f, 
-            0.5f,  0.5f, -0.5f,   0f, 0f, -1f,   0f, 1f, 
-            -0.5f,  0.5f, -0.5f,   0f, 0f, -1f,   1f, 1f, 
+    // --- BACK FACE (Normal 0, 0, -1) ---
+    // Sequence: Bottom-Right -> Bottom-Left -> Top-Left -> Top-Right (Relative to Front view)
+    Helpers.AddFace(vertices, indices,
+        new Vertex(new Vector3( 0.5f, -0.5f, -0.5f), new Vector3(0, 0, -1), new Vector2(0, 0), Vector3.Zero, Vector3.Zero), // BR
+        new Vertex(new Vector3(-0.5f, -0.5f, -0.5f), new Vector3(0, 0, -1), new Vector2(1, 0), Vector3.Zero, Vector3.Zero), // BL
+        new Vertex(new Vector3(-0.5f,  0.5f, -0.5f), new Vector3(0, 0, -1), new Vector2(1, 1), Vector3.Zero, Vector3.Zero), // TL
+        new Vertex(new Vector3( 0.5f,  0.5f, -0.5f), new Vector3(0, 0, -1), new Vector2(0, 1), Vector3.Zero, Vector3.Zero)  // TR
+    );
 
-            // --- Left Face (Normal points -X: -1, 0, 0) ---
-            -0.5f, -0.5f, -0.5f,  -1f, 0f, 0f,    0f, 0f, 
-            -0.5f, -0.5f,  0.5f,  -1f, 0f, 0f,    1f, 0f, 
-            -0.5f,  0.5f,  0.5f,  -1f, 0f, 0f,    1f, 1f, 
-            -0.5f,  0.5f, -0.5f,  -1f, 0f, 0f,    0f, 1f, 
+    // --- LEFT FACE (Normal -1, 0, 0) ---
+    // Sequence: Back-Left -> Front-Left -> Front-Top -> Back-Top
+    Helpers.AddFace(vertices, indices,
+        new Vertex(new Vector3(-0.5f, -0.5f, -0.5f), new Vector3(-1, 0, 0), new Vector2(0, 0), Vector3.Zero, Vector3.Zero), // BL
+        new Vertex(new Vector3(-0.5f, -0.5f,  0.5f), new Vector3(-1, 0, 0), new Vector2(1, 0), Vector3.Zero, Vector3.Zero), // FL
+        new Vertex(new Vector3(-0.5f,  0.5f,  0.5f), new Vector3(-1, 0, 0), new Vector2(1, 1), Vector3.Zero, Vector3.Zero), // FT
+        new Vertex(new Vector3(-0.5f,  0.5f, -0.5f), new Vector3(-1, 0, 0), new Vector2(0, 1), Vector3.Zero, Vector3.Zero)  // BT
+    );
 
-            // --- Right Face (Normal points +X: 1, 0, 0) ---
-            0.5f, -0.5f, -0.5f,   1f, 0f, 0f,    1f, 0f, 
-            0.5f, -0.5f,  0.5f,   1f, 0f, 0f,    0f, 0f, 
-            0.5f,  0.5f,  0.5f,   1f, 0f, 0f,    0f, 1f, 
-            0.5f,  0.5f, -0.5f,   1f, 0f, 0f,    1f, 1f, 
+    // --- RIGHT FACE (Normal 1, 0, 0) ---
+    // Sequence: Front-Right -> Back-Right -> Back-Top -> Front-Top
+    Helpers.AddFace(vertices, indices,
+        new Vertex(new Vector3( 0.5f, -0.5f,  0.5f), new Vector3(1, 0, 0), new Vector2(0, 0), Vector3.Zero, Vector3.Zero), // FR
+        new Vertex(new Vector3( 0.5f, -0.5f, -0.5f), new Vector3(1, 0, 0), new Vector2(1, 0), Vector3.Zero, Vector3.Zero), // BR
+        new Vertex(new Vector3( 0.5f,  0.5f, -0.5f), new Vector3(1, 0, 0), new Vector2(1, 1), Vector3.Zero, Vector3.Zero), // BT
+        new Vertex(new Vector3( 0.5f,  0.5f,  0.5f), new Vector3(1, 0, 0), new Vector2(0, 1), Vector3.Zero, Vector3.Zero)  // FT
+    );
 
-            // --- Top Face (Normal points +Y: 0, 1, 0) ---
-            -0.5f,  0.5f, -0.5f,   0f, 1f, 0f,    0f, 1f, 
-            0.5f,  0.5f, -0.5f,   0f, 1f, 0f,    1f, 1f, 
-            0.5f,  0.5f,  0.5f,   0f, 1f, 0f,    1f, 0f, 
-            -0.5f,  0.5f,  0.5f,   0f, 1f, 0f,    0f, 0f, 
+    // --- TOP FACE (Normal 0, 1, 0) ---
+    // Sequence: Front-Left -> Front-Right -> Back-Right -> Back-Left
+    Helpers.AddFace(vertices, indices,
+        new Vertex(new Vector3(-0.5f,  0.5f,  0.5f), new Vector3(0, 1, 0), new Vector2(0, 0), Vector3.Zero, Vector3.Zero), // FL
+        new Vertex(new Vector3( 0.5f,  0.5f,  0.5f), new Vector3(0, 1, 0), new Vector2(1, 0), Vector3.Zero, Vector3.Zero), // FR
+        new Vertex(new Vector3( 0.5f,  0.5f, -0.5f), new Vector3(0, 1, 0), new Vector2(1, 1), Vector3.Zero, Vector3.Zero), // BR
+        new Vertex(new Vector3(-0.5f,  0.5f, -0.5f), new Vector3(0, 1, 0), new Vector2(0, 1), Vector3.Zero, Vector3.Zero)  // BL
+    );
 
-            // --- Bottom Face (Normal points -Y: 0, -1, 0) ---
-            -0.5f, -0.5f, -0.5f,   0f, -1f, 0f,   1f, 1f, 
-            0.5f, -0.5f, -0.5f,   0f, -1f, 0f,   0f, 1f, 
-            0.5f, -0.5f,  0.5f,   0f, -1f, 0f,   0f, 0f, 
-            -0.5f, -0.5f,  0.5f,   0f, -1f, 0f,   1f, 0f
+    // --- BOTTOM FACE (Normal 0, -1, 0) ---
+    // Sequence: Front-Left -> Back-Left -> Back-Right -> Front-Right
+    Helpers.AddFace(vertices, indices,
+        new Vertex(new Vector3(-0.5f, -0.5f,  0.5f), new Vector3(0, -1, 0), new Vector2(0, 1), Vector3.Zero, Vector3.Zero), // FL
+        new Vertex(new Vector3(-0.5f, -0.5f, -0.5f), new Vector3(0, -1, 0), new Vector2(0, 0), Vector3.Zero, Vector3.Zero), // BL
+        new Vertex(new Vector3( 0.5f, -0.5f, -0.5f), new Vector3(0, -1, 0), new Vector2(1, 0), Vector3.Zero, Vector3.Zero), // BR
+        new Vertex(new Vector3( 0.5f, -0.5f,  0.5f), new Vector3(0, -1, 0), new Vector2(1, 1), Vector3.Zero, Vector3.Zero)  // FR
+    );
         
-        };
 
-        uint[] indices = {
-            // Front face
-            0, 2, 1,
-            0, 2, 3,
-            // Back face
-            4, 5, 6,
-            4, 6, 7,
-            // Left face
-            8, 9, 10,
-            8, 10, 11,
-            // Right face
-            12, 14, 13,
-            12, 14, 15,
-            // Top face
-            16, 17, 18,
-            16, 18, 19,
-            // Bottom face
-            20, 22, 21,
-            20, 22, 23
-        };
+        List<float> finalFloats = new List<float>();
 
-        return new Mesh(vertices, indices, Mesh.VertexLayout.PosTexNormal);
+        foreach (var v in vertices)
+        {
+            finalFloats.Add(v.Position.X); finalFloats.Add(v.Position.Y); finalFloats.Add(v.Position.Z);
+            finalFloats.Add(v.Normal.X); finalFloats.Add(v.Normal.Y); finalFloats.Add(v.Normal.Z);
+            finalFloats.Add(v.TexCoords.X); finalFloats.Add(v.TexCoords.Y);
+    
+            // --- NEW: Add Tangent and Bitangent ---
+            finalFloats.Add(v.Tangent.X); finalFloats.Add(v.Tangent.Y); finalFloats.Add(v.Tangent.Z);
+            finalFloats.Add(v.Bitangent.X); finalFloats.Add(v.Bitangent.Y); finalFloats.Add(v.Bitangent.Z);
+        }
+        
+        return new Mesh(finalFloats.ToArray(), indices.ToArray(), Mesh.VertexLayout.PosTexNormalTangent);
     }
     
     public static Mesh CreateColouredCircle()
@@ -321,6 +332,26 @@ public static class ShapeFactory
 
     return new Mesh(vertices.ToArray(), indices.ToArray(), Mesh.VertexLayout.PosTexNormal);
 }
+    public static Mesh createTexturedSquare()
+    {
+        float[] vertices = {
+            // Format:  X,     Y,     Z,      U,  V
+        
+            // --- Front Face ---
+            -0.5f, -0.5f,  0.0f,   0f, 0f, // Bottom-left
+            0.5f, -0.5f,  0.0f,   1f, 0f, // Bottom-right
+            0.5f,  0.5f,  0.0f,   1f, 1f, // Top-right
+            -0.5f,  0.5f,  0.0f,   0f, 1f, // Top-left
+        };
+        
+        uint[] indices = {
+            // Front face
+            0, 2, 1,
+            0, 2, 3,
+        };
+        
+        return new Mesh(vertices, indices, Mesh.VertexLayout.PosTex);
+    }
     
     
 }

TheRepo/TheLabs/Vertex.cs

@@ -0,0 +1,22 @@
+using OpenTK.Mathematics;
+
+namespace TheLabs;
+
+public struct Vertex
+{
+    public Vector3 Position;
+    public Vector3 Normal;
+    public Vector2 TexCoords;
+    public Vector3 Tangent;
+    public Vector3 Bitangent;
+
+    // A constructor to make creating them easy
+    public Vertex(Vector3 position, Vector3 normal, Vector2 texCoords, Vector3 tangent, Vector3 bitangent)
+    {
+        Position = position;
+        Normal = normal;
+        TexCoords = texCoords;
+        Tangent = tangent;
+        Bitangent = bitangent;
+    }
+}