Implement Ocean LOD management and enhance grid generation with wireframe support

index.html

@@ -190,77 +190,43 @@
         precision mediump float;
 
         varying vec3 v_fragPos;
-        varying vec2 v_uv;
+        varying vec3 v_normal;
 
         uniform vec3 eyePos;
-        uniform sampler2D displace_map;
 
-        vec3 lightPos = vec3(0.,0.,10.); //not used in diffuse. diffuse uses a directional light. It is only used for specular glittering.
+        vec3 lightColor = vec3(1.0, 1.0, 1.0);
-        vec3 lightColor = vec3(1.0,1.0,1.0);
-        
-        //using forward difference
-        //Normal vectors are compute as: https://www.scratchapixel.com/lessons/procedural-generation-virtual-worlds/perlin-noise-part-2/perlin-noise-computing-derivatives
         
         void main(void) {
-            vec4 displace = texture2D(displace_map, v_uv);
+            vec3 norm = normalize(v_normal);
-            //calculate normal
+            vec3 lightDir = normalize(vec3(0.3, 0.5, 1.0)); // Sun direction
-            float gridPointDelta = (1. / 256.);
-            vec3 currPoint = vec3(0.0,0.0,displace.x);
-            vec3 right = vec3(gridPointDelta,0.0,texture2D(displace_map,vec2(v_uv.x + gridPointDelta,v_uv.y)).x*(1./1.));
-            vec3 left = vec3(-gridPointDelta,0.0,texture2D(displace_map,vec2(v_uv.x - gridPointDelta,v_uv.y)).x*(1./1.));
-            vec3 up = vec3(0.,gridPointDelta,texture2D(displace_map,vec2(v_uv.x ,v_uv.y + gridPointDelta)).x*(1./1.));
-            vec3 down = vec3(0.,-gridPointDelta,texture2D(displace_map,vec2(v_uv.x ,v_uv.y - gridPointDelta)).x*(1./1.));
 
-            //vec3 tangent = normalize(right - currPoint);
+            float diff = max(dot(norm, lightDir), 0.0);
-            //vec3 biTangent = normalize(up - currPoint);
-            vec3 tangent = normalize(vec3(gridPointDelta,0.,right.z-left.z));
-            vec3 biTangent = normalize(vec3(0.,gridPointDelta,down.z-up.z));
-            //vec3 normal = biTangent;
-            vec3 normal = cross(tangent, biTangent);
-
-            vec3 norm = normalize(normal);
-            norm.y *= -1.; //Normal y direction is somehow inverted
-            //vec3 lightDir = normalize(lightPos - v_fragPos);
-            vec3 lightDir = normalize(-vec3(0.0,.0,-1.)); //sun shines in drection of -z
-
-            float diff = max(dot(norm,lightDir),0.0);
             vec3 diffuse = diff * lightColor;
-            vec3 result = (diffuse) * vec3(0.0,0.0,1.0);
 
-            //Old lightning
+            // View direction
-            vec3 toCameraVector = normalize(v_fragPos - eyePos);
+            vec3 toCameraVector = normalize(eyePos - v_fragPos);
-            vec3 reflec = normalize(reflect(toCameraVector, norm));
+            vec3 reflec = normalize(reflect(-toCameraVector, norm));
 
-            //Schlicks approximation to Fresnelfactor
+            // Schlick's approximation to Fresnel factor
-	        float n1 = 1., n2 = 1.33333;
+            float n1 = 1.0, n2 = 1.33333;
-	        float R0 = pow((n1-n2)/(n1+n2), 2.);
+            float R0 = pow((n1 - n2) / (n1 + n2), 2.0);
-        	float fresnel = R0 + (1. - R0)*pow((1.-dot(norm,reflec)),5.) ;
+            float fresnel = R0 + (1.0 - R0) * pow(1.0 - max(dot(norm, toCameraVector), 0.0), 5.0);
 
-            //vec3 waterColor = vec3(34./255.,154./255.,211./255.);
+            vec3 oceanColor = vec3(0.0, 0.3, 0.4);
-            vec3 oceanColor = vec3(0,.4,.4); // under-sea colour
+            vec3 skyColor = vec3(0.6, 0.8, 1.0);
-            vec3 skyColor = vec3(1.,1.,1.);
             
-            //Subsurface scattering
+            // Specular highlights
-            vec3 sssSun = vec3(0.,-5.,-7.0);
+            vec3 halfwayDir = normalize(lightDir + toCameraVector);
-            vec3 tosssSunVec = normalize(sssSun - v_fragPos);
+            float spec = pow(max(dot(norm, halfwayDir), 0.0), 256.0);
-            vec3 tosssSun = normalize(vec3(0.0,-100.,1.));
+            vec3 specular = spec * lightColor * 0.8;
-            float ssDistortion = 0.1;
-            float sssIntensity = 1.;
-            vec3 halfWay = normalize(tosssSun+norm*ssDistortion);
-            float ssScateringCoef = pow(clamp(dot(toCameraVector,-halfWay),0.0,1.0),5.) * sssIntensity;
-            //Sun glittering
-            float glitterFactor = max(0.0,dot(tosssSunVec,reflect(-toCameraVector,norm)));
-            if(!(glitterFactor > 0.98)) {
-                glitterFactor = 0.0;
-            }
 
-            //gl_FragColor = vec4(oceanColor + lightColor * glitterFactor,1.0);
+            // Subsurface scattering approximation
-            //gl_FragColor=vec4(clamp(oceanColor + (oceanColor*ssScateringCoef),0.,1.0),1.0); //Display subsurfacecatterting component
+            float sss = pow(max(dot(toCameraVector, -lightDir), 0.0), 4.0) * 0.3;
-            //gl_FragColor = vec4((mix(oceanColor,skyColor,fresnel).xyz), 1.); //Just display reflection component
+            vec3 sssColor = vec3(0.0, 0.5, 0.5) * sss;
-            //gl_FragColor = vec4(diffuse * oceanColor,1.0); //Render only diffuse component
+
-            //gl_FragColor = vec4(normal,1.0); //show Normal map
+            vec3 finalColor = mix(oceanColor, skyColor, fresnel) * clamp(diffuse, 0.4, 1.0) + specular + sssColor;
-            //gl_FragColor = vec4(displace.x,displace.x,displace.x,1.0); //Show Perlin Noise texture deactivate vertex distrotion before
+            
-            gl_FragColor = vec4((clamp(diffuse,0.97,1.0) * (mix(oceanColor + (oceanColor*ssScateringCoef),skyColor*0.8,fresnel).xyz))+ lightColor * glitterFactor, 1.0); //All combined
+            gl_FragColor = vec4(finalColor, 1.0);
         }
     </script>
     <script id="default-vs" type="x-shader/x-vertex">
@@ -269,17 +235,81 @@
             uniform mat4 view;
             uniform mat4 model;
             uniform mat4 projection;
-            uniform sampler2D displace_map;
+            uniform float uTime;
 
-            varying vec2 v_uv;
             varying vec3 v_fragPos;
+            varying vec3 v_normal;
+            
+            // Gerstner wave function
+            // Returns displacement (xyz) and partial derivatives for normal calculation
+            vec3 gerstnerWave(vec2 pos, float time, vec2 direction, float steepness, float wavelength, out vec3 tangent, out vec3 binormal) {
+                float k = 2.0 * 3.14159 / wavelength;
+                float c = sqrt(9.8 / k);
+                vec2 d = normalize(direction);
+                float f = k * (dot(d, pos) - c * time);
+                float a = steepness / k;
+                
+                tangent = vec3(
+                    1.0 - steepness * d.x * d.x * sin(f),
+                    steepness * d.x * cos(f),
+                    -steepness * d.x * d.y * sin(f)
+                );
+                
+                binormal = vec3(
+                    -steepness * d.x * d.y * sin(f),
+                    steepness * d.y * cos(f),
+                    1.0 - steepness * d.y * d.y * sin(f)
+                );
+                
+                return vec3(
+                    d.x * a * cos(f),
+                    a * sin(f),
+                    d.y * a * cos(f)
+                );
+            }
          
             void main(void) {
-                vec4 displace = texture2D(displace_map, vec2(positionAttr.x,positionAttr.y));
+                vec4 worldPos = model * vec4(positionAttr.xyz, 1.0);
-                vec4 worldPos = model * vec4(positionAttr.x,positionAttr.y,positionAttr.z + displace.x, 1.0);
+                vec2 pos = worldPos.xy;
+                float time = uTime * 0.001;
+                
+                vec3 displacement = vec3(0.0);
+                vec3 tangent = vec3(1.0, 0.0, 0.0);
+                vec3 binormal = vec3(0.0, 0.0, 1.0);
+                vec3 t, b;
+                
+                // Wave 1 - Primary large wave
+                displacement += gerstnerWave(pos, time, vec2(1.0, 0.3), 0.25, 4.0, t, b);
+                tangent += t - vec3(1.0, 0.0, 0.0);
+                binormal += b - vec3(0.0, 0.0, 1.0);
+                
+                // Wave 2 - Secondary wave at different angle
+                displacement += gerstnerWave(pos, time, vec2(0.5, 1.0), 0.15, 2.5, t, b);
+                tangent += t - vec3(1.0, 0.0, 0.0);
+                binormal += b - vec3(0.0, 0.0, 1.0);
+                
+                // Wave 3 - Smaller detail wave
+                displacement += gerstnerWave(pos, time, vec2(-0.3, 0.7), 0.1, 1.5, t, b);
+                tangent += t - vec3(1.0, 0.0, 0.0);
+                binormal += b - vec3(0.0, 0.0, 1.0);
+                
+                // Wave 4 - Tiny ripples
+                displacement += gerstnerWave(pos, time, vec2(0.8, -0.4), 0.08, 0.8, t, b);
+                tangent += t - vec3(1.0, 0.0, 0.0);
+                binormal += b - vec3(0.0, 0.0, 1.0);
+                
+                // Apply displacement - Gerstner displaces horizontally (x,z) and vertically (y)
+                worldPos.x += displacement.x;
+                worldPos.y += displacement.z;
+                worldPos.z += displacement.y;
+                
+                // Calculate normal from tangent and binormal
+                vec3 normal = normalize(cross(binormal, tangent));
+                // Swap components to match our coordinate system (z is up)
+                v_normal = vec3(normal.x, normal.z, normal.y);
+                
                 gl_Position = projection * view * worldPos;
                 v_fragPos = worldPos.xyz;
-                v_uv = positionAttr.xy;
             }
     </script>
     <script id="sky-fs" type="x-shader/x-fragment">
@@ -330,6 +360,9 @@
         <div class="control-group">
             <strong>Toggle Help:</strong> <span class="key">H</span>
         </div>
+        <div class="control-group" style="margin-top: 10px; padding-top: 10px; border-top: 1px solid rgba(255, 255, 255, 0.2);">
+            <button id="wireframe-toggle" style="background: rgba(255, 255, 255, 0.2); color: white; border: none; padding: 8px 12px; border-radius: 4px; cursor: pointer; width: 100%; font-size: 13px;">Wireframe: OFF</button>
+        </div>
     </div>
     
     <button id="toggle-controls">Toggle Controls (H)</button>
@@ -351,6 +384,12 @@
                 controls.classList.toggle('hidden');
             }
         });
+        
+        // Wireframe toggle
+        const wireframeBtn = document.getElementById('wireframe-toggle');
+        wireframeBtn.addEventListener('click', () => {
+            window.dispatchEvent(new CustomEvent('toggleWireframe'));
+        });
     </script>
 </body>
 

src/Grid.ts

@@ -1,23 +1,34 @@
 /** Grid for the water surface */
 export class Grid {
     private indices: number[] = [];
+    private lineIndices: number[] = [];
     private vertices: number[] = [];
     private vao: WebGLVertexArrayObject | null = null;
+    private lineVao: WebGLVertexArrayObject | null = null;
     private size: number;
+    private offsetX: number;
+    private offsetY: number;
+    private scale: number;
 
-    constructor(size: number = 128) {
+    constructor(size: number = 128, offsetX: number = 0, offsetY: number = 0, scale: number = 1) {
         this.size = size;
+        this.offsetX = offsetX;
+        this.offsetY = offsetY;
+        this.scale = scale;
     }
 
     generate(): void {
         this.indices = [];
+        this.lineIndices = [];
         this.vertices = [];
 
         for (let j = 0; j <= this.size; ++j) {
             for (let i = 0; i <= this.size; ++i) {
-                // Generate Vertices
+                // Generate Vertices normalized to 0-1, then scale and offset
-                const x = i / this.size;
+                const u = i / this.size;
-                const y = j / this.size;
+                const v = j / this.size;
+                const x = (u - 0.5) * this.scale + this.offsetX;
+                const y = (v - 0.5) * this.scale + this.offsetY;
                 const z = 0;
                 this.vertices.push(x, y, z);
 
@@ -35,6 +46,16 @@ export class Grid {
                     this.indices.push(row2 + i + 1);
                     this.indices.push(row2 + i);
                 }
+                
+                // Generate line indices for wireframe
+                if (i < this.size) {
+                    const currentVertex = j * (this.size + 1) + i;
+                    this.lineIndices.push(currentVertex, currentVertex + 1);
+                }
+                if (j < this.size) {
+                    const currentVertex = j * (this.size + 1) + i;
+                    this.lineIndices.push(currentVertex, currentVertex + (this.size + 1));
+                }
             }
         }
     }
@@ -42,6 +63,7 @@ export class Grid {
     initVAO(gl: WebGL2RenderingContext): void {
         this.generate();
 
+        // Create VAO for filled triangles
         this.vao = gl.createVertexArray();
         gl.bindVertexArray(this.vao);
 
@@ -56,10 +78,28 @@ export class Grid {
         gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 3 * Float32Array.BYTES_PER_ELEMENT, 0);
         gl.enableVertexAttribArray(0);
         gl.bindVertexArray(null);
+        
+        // Create VAO for wireframe lines
+        this.lineVao = gl.createVertexArray();
+        gl.bindVertexArray(this.lineVao);
+        
+        gl.bindBuffer(gl.ARRAY_BUFFER, vboGrid);
+        
+        const iboLine: WebGLBuffer | null = gl.createBuffer();
+        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, iboLine);
+        gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint32Array(this.lineIndices), gl.STATIC_DRAW);
+        
+        gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 3 * Float32Array.BYTES_PER_ELEMENT, 0);
+        gl.enableVertexAttribArray(0);
+        gl.bindVertexArray(null);
     }
 
-    draw(gl: WebGL2RenderingContext): void {
+    draw(gl: WebGL2RenderingContext, wireframe: boolean = false): void {
-        if (this.vao) {
+        if (wireframe && this.lineVao) {
+            gl.bindVertexArray(this.lineVao);
+            gl.drawElements(gl.LINES, this.lineIndices.length, gl.UNSIGNED_INT, 0);
+            gl.bindVertexArray(null);
+        } else if (this.vao) {
             gl.bindVertexArray(this.vao);
             gl.drawElements(gl.TRIANGLES, this.indices.length, gl.UNSIGNED_INT, 0);
             gl.bindVertexArray(null);

src/OceanLOD.ts

@@ -0,0 +1,118 @@
+import { Grid } from './Grid';
+import { vec3 } from 'gl-matrix';
+
+/** Manages multiple ocean grid patches with LOD based on camera distance */
+export class OceanLOD {
+    private grids: Array<{ 
+        grid: Grid; 
+        centerX: number; 
+        centerY: number;
+        size: number;
+        lodLevel: number;
+    }> = [];
+    
+    private readonly LOD_LEVELS = [
+        { distance: 2.0, gridSize: 128 },   // Closest - highest detail
+        { distance: 5.0, gridSize: 64 },    // Medium distance
+        { distance: 10.0, gridSize: 32 },   // Far distance
+        { distance: 20.0, gridSize: 16 },   // Very far - lowest detail
+    ];
+    
+    private readonly PATCH_SIZE = 2.0; // World size of each patch
+    private readonly PATCHES_PER_SIDE = 7; // 7x7 = 49 patches total
+    
+    constructor() {
+        this.createGridPatches();
+    }
+    
+    private createGridPatches(): void {
+        const halfPatches = Math.floor(this.PATCHES_PER_SIDE / 2);
+        
+        for (let y = -halfPatches; y <= halfPatches; y++) {
+            for (let x = -halfPatches; x <= halfPatches; x++) {
+                const centerX = x * this.PATCH_SIZE;
+                const centerY = y * this.PATCH_SIZE;
+                
+                // Start with lowest detail - will be updated based on camera
+                const grid = new Grid(
+                    this.LOD_LEVELS[3].gridSize,
+                    centerX,
+                    centerY,
+                    this.PATCH_SIZE
+                );
+                
+                this.grids.push({
+                    grid,
+                    centerX,
+                    centerY,
+                    size: this.PATCH_SIZE,
+                    lodLevel: 3
+                });
+            }
+        }
+    }
+    
+    /** Update LOD based on camera position */
+    updateLOD(gl: WebGL2RenderingContext, cameraPos: vec3): void {
+        for (const patch of this.grids) {
+            // Calculate distance from camera to patch center
+            const dx = patch.centerX - cameraPos[0];
+            const dy = patch.centerY - cameraPos[1];
+            const distance = Math.sqrt(dx * dx + dy * dy);
+            
+            // Determine appropriate LOD level
+            let newLodLevel = 3; // Default to lowest detail
+            for (let i = 0; i < this.LOD_LEVELS.length; i++) {
+                if (distance < this.LOD_LEVELS[i].distance) {
+                    newLodLevel = i;
+                    break;
+                }
+            }
+            
+            // Only recreate grid if LOD level changed
+            if (newLodLevel !== patch.lodLevel) {
+                patch.lodLevel = newLodLevel;
+                patch.grid = new Grid(
+                    this.LOD_LEVELS[newLodLevel].gridSize,
+                    patch.centerX,
+                    patch.centerY,
+                    patch.size
+                );
+                patch.grid.initVAO(gl);
+            }
+        }
+    }
+    
+    initVAO(gl: WebGL2RenderingContext): void {
+        for (const { grid } of this.grids) {
+            grid.initVAO(gl);
+        }
+    }
+    
+    draw(gl: WebGL2RenderingContext, wireframe: boolean = false): void {
+        for (const { grid } of this.grids) {
+            grid.draw(gl, wireframe);
+        }
+    }
+    
+    getGridCount(): number {
+        return this.grids.length;
+    }
+    
+    getTotalVertexCount(): number {
+        let total = 0;
+        for (const { grid } of this.grids) {
+            total += grid.getIndexCount() / 3;
+        }
+        return total;
+    }
+    
+    /** Get statistics about current LOD distribution */
+    getLODStats(): { [key: number]: number } {
+        const stats: { [key: number]: number } = { 0: 0, 1: 0, 2: 0, 3: 0 };
+        for (const patch of this.grids) {
+            stats[patch.lodLevel]++;
+        }
+        return stats;
+    }
+}

src/constants.ts

@@ -1,7 +1,7 @@
 // Configuration Constants
 export const GRID_SIZE = 128;
-export const NOISE_TEXTURE_WIDTH = 256;
+export const NOISE_TEXTURE_WIDTH = 1024;
-export const NOISE_TEXTURE_HEIGHT = 256;
+export const NOISE_TEXTURE_HEIGHT = 1024;
 export const CANVAS_WIDTH = 800;
 export const CANVAS_HEIGHT = 600;
 export const FOV = 1.0;

src/main.ts

@@ -1,6 +1,6 @@
 import { vec3, mat4 } from 'gl-matrix';
 import { Camera } from './Camera';
-import { Grid } from './Grid';
+import { OceanLOD } from './OceanLOD';
 import { createProgram } from './Shader';
 import * as Config from './constants';
 
@@ -112,8 +112,8 @@ function initFBO() {
     // set the filtering so we don't need mips
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
 
     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, textureFBO, 0);
 
@@ -131,6 +131,7 @@ var lastTime = new Date().getTime();
 var counter = 0.0;
 var fps = 0;
 var fpsDisplay: HTMLElement | null = null;
+var lodStatsTimer = 0;
 /** Input states*/
 var mouseXVel = 0;
 var mouseYVel = 0;
@@ -140,14 +141,17 @@ var keyboardZoom = 0;
 var keysPressed: Set<string> = new Set();
 /** Objects and states*/
 var camera: Camera;
-var oceanGrid: Grid;
+var oceanLOD: OceanLOD;
 var curRotX = Config.CAMERA_DEFAULT_ROT_X;
 var curRotY = Config.CAMERA_DEFAULT_ROT_Y;
+var wireframeMode = false;
 function drawScene() {
     fps++;
     let now = new Date();
     let delta = now.getTime() - lastTime;
     timeSpent += delta;
+    lodStatsTimer += delta;
+    
     if ((counter += delta) >= Config.FPS_UPDATE_INTERVAL) {
         counter = 0;
         if (fpsDisplay) {
@@ -155,62 +159,38 @@ function drawScene() {
         }
         fps = 0;
     }
-    lastTime = now.getTime();
-    // Two Rendering passes. The first one generates a perlin noise 
-    // texture. Second one uses the textur for vertex displacement 
-    // of a grid representing the water surface.
     
-    //--- First render pass -> Perlin Noise (it updates the perlin noise texture)
+    // Log LOD stats every 5 seconds
-    {
+    if (lodStatsTimer >= 5000) {
-        gl.bindFramebuffer(gl.FRAMEBUFFER, perlinNoiseFBO);
+        lodStatsTimer = 0;
-        gl.viewport(0, 0, perlinNoiseFBOWidth, perlinNoiseFBOHeight);
+        const stats = oceanLOD.getLODStats();
-
+        console.log(`LOD Stats - High:${stats[0]} Med:${stats[1]} Low:${stats[2]} VeryLow:${stats[3]}`);
-        //Clear buffer content
-        gl.clearColor(1.0, 1.0, 1.0, 1);
-        gl.clear(gl.COLOR_BUFFER_BIT); //No depth buffer
-
-        //draw a fullscreen quad
-        gl.bindBuffer(gl.ARRAY_BUFFER, VBO);
-
-        // There are 7 floating-point values per vertex
-        let stride = 5 * Float32Array.BYTES_PER_ELEMENT;
-
-        // Set up position stream
-        gl.vertexAttribPointer(0, 3, gl.FLOAT, false, stride, 0);
-        gl.enableVertexAttribArray(0);
-        gl.vertexAttribPointer(1, 2, gl.FLOAT, false, stride, 3 * Float32Array.BYTES_PER_ELEMENT);
-        gl.enableVertexAttribArray(1);
-
-        gl.useProgram(perlinNoiseProgram);
-        let uTime = gl.getUniformLocation(<WebGLProgram>perlinNoiseProgram, "uTime");
-        gl.uniform1f(uTime, timeSpent);
-        gl.drawArrays(gl.TRIANGLES, 0, 6); // Draw fullscreen quad
     }
+    lastTime = now.getTime();
+    // Single render pass with Gerstner waves computed in vertex shader
 
-    //--- Second render pass -> Geomtry with displacement by perlin noise texture ---
+    //--- Render pass -> Ocean with Gerstner wave displacement ---
     {
         gl.bindFramebuffer(gl.FRAMEBUFFER, null); //Bind default framebuffer
         gl.viewport(0, 0, viewportWidth, viewportHeight);
 
         gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
 
-        gl.activeTexture(gl.TEXTURE0); //Binds the texture to 0
-        gl.bindTexture(gl.TEXTURE_2D, textureFBO);
-
         var projection = mat4.create();
         mat4.identity(projection);
-        mat4.perspective(projection, Config.FOV, viewportWidth / viewportHeight, Config.NEAR_PLANE, Config.FAR_PLANE); //projection mode should actually be camera specific
+        mat4.perspective(projection, Config.FOV, viewportWidth / viewportHeight, Config.NEAR_PLANE, Config.FAR_PLANE);
 
         camera.setOffset(Config.CAMERA_DEFAULT_OFFSET + keyboardZoom);
         camera.setRotationX((curRotX += mouseYVel * Config.MOUSE_SENSITIVITY + keyboardRotationX));
         camera.setRotationY((curRotY += mouseXVel * Config.MOUSE_SENSITIVITY + keyboardRotationY));
         var view = camera.getViewMatrix();
 
+        // Update LOD based on camera position
+        oceanLOD.updateLOD(gl, camera.pos);
+
         var model = mat4.create();
         mat4.identity(model);
-        let translationCentering = vec3.create();
+        // No centering needed - grids are already positioned correctly in world space
-        vec3.set(translationCentering, -0.5, -0.5, 0.0);
-        mat4.translate(model, model, translationCentering); //1. First Center the Surface in the origin.
 
         gl.useProgram(defaultProgram);
         let view_loc = gl.getUniformLocation(<WebGLProgram>defaultProgram, "view");
@@ -221,11 +201,9 @@ function drawScene() {
         gl.uniformMatrix4fv(projection_loc, false, projection);
         let eye_loc = gl.getUniformLocation(<WebGLProgram>defaultProgram, "eyePos");
         gl.uniform3fv(eye_loc, camera.pos);
-        //let uTime_loc = gl.getUniformLocation(<WebGLProgram>defaultProgram, "uTime");
+        let uTime_loc = gl.getUniformLocation(<WebGLProgram>defaultProgram, "uTime");
-        //gl.uniform1f(uTime_loc, timeSpent);
+        gl.uniform1f(uTime_loc, timeSpent);
-        let displacementMap_loc = gl.getUniformLocation(<WebGLProgram>defaultProgram, "displace_map");
+        oceanLOD.draw(gl, wireframeMode);
-        gl.uniform1i(displacementMap_loc, 0); //Get texture from slot 0
-        oceanGrid.draw(gl);
     }
     requestAnimationFrame(drawScene);
 }
@@ -318,12 +296,23 @@ function main() {
         updateCanvasSize(canvas);
     });
     
+    // Wireframe toggle handler
+    window.addEventListener('toggleWireframe', () => {
+        wireframeMode = !wireframeMode;
+        const wireframeBtn = document.getElementById('wireframe-toggle');
+        if (wireframeBtn) {
+            wireframeBtn.textContent = `Wireframe: ${wireframeMode ? 'ON' : 'OFF'}`;
+        }
+        console.log(`Wireframe mode: ${wireframeMode ? 'ON' : 'OFF'}`);
+    });
+
     initShaders();
     initGeometry();
     initFBO();
     
-    oceanGrid = new Grid(Config.GRID_SIZE);
+    oceanLOD = new OceanLOD();
-    oceanGrid.initVAO(gl);
+    oceanLOD.initVAO(gl);
+    console.log(`Ocean LOD initialized with ${oceanLOD.getGridCount()} patches`);
 
     camera = new Camera();
     //Check if any errors apeared during init.