Enhance OceanLOD to consider view direction in LOD updates and adjust grid size parameters

src/OceanLOD.ts

@@ -1,7 +1,7 @@
 import { Grid } from './Grid';
 import { vec3 } from 'gl-matrix';
 
-/** Manages multiple ocean grid patches with LOD based on camera distance */
+/** Manages multiple ocean grid patches with LOD based on camera distance and view cone */
 export class OceanLOD {
     private grids: Array<{ 
         grid: Grid; 
@@ -12,14 +12,15 @@ export class OceanLOD {
     }> = [];
     
     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
+        { distance: 2.0, gridSize: 256 },   // Closest - highest detail
+        { distance: 5.0, gridSize: 128 },   // Medium distance
+        { distance: 10.0, gridSize: 64 },   // Far distance
+        { distance: 20.0, gridSize: 32 },   // 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
+    private readonly VIEW_CONE_COS = Math.cos(Math.PI * 0.45); // ~81 degree half-angle (wider than typical FOV)
     
     constructor() {
         this.createGridPatches();
@@ -52,22 +53,56 @@ export class OceanLOD {
         }
     }
     
-    /** 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);
+    /** Update LOD based on camera position and view direction */
+    updateLOD(gl: WebGL2RenderingContext, cameraPos: vec3, cameraTarget: vec3): void {
+        // Calculate view direction (normalized)
+        const viewDir = vec3.create();
+        vec3.subtract(viewDir, cameraTarget, cameraPos);
+        vec3.normalize(viewDir, viewDir);
         
-            // Determine appropriate LOD level
+        for (const patch of this.grids) {
+            // Calculate vector from camera to patch center (on XY plane, Z=0 for ocean surface)
+            const toPatch = vec3.fromValues(
+                patch.centerX - cameraPos[0],
+                patch.centerY - cameraPos[1],
+                0 - cameraPos[2]  // Ocean is at Z=0
+            );
+            const distance = vec3.length(toPatch);
+            
+            // Normalize direction to patch
+            const toPatchDir = vec3.create();
+            vec3.normalize(toPatchDir, toPatch);
+            
+            // Calculate dot product with view direction (how aligned is patch with where we're looking)
+            const dotProduct = vec3.dot(viewDir, toPatchDir);
+            
+            // Determine if patch is in front of camera and within view cone
+            const isInFront = dotProduct > -0.2; // Slightly behind is ok for edge cases
+            const isInViewCone = dotProduct > this.VIEW_CONE_COS;
+            
+            // Calculate LOD level
             let newLodLevel = 3; // Default to lowest detail
+            
+            if (!isInFront) {
+                // Behind camera - always lowest detail
+                newLodLevel = 3;
+            } else if (isInViewCone) {
+                // In view cone - use distance-based LOD
                 for (let i = 0; i < this.LOD_LEVELS.length; i++) {
                     if (distance < this.LOD_LEVELS[i].distance) {
                         newLodLevel = i;
                         break;
                     }
                 }
+            } else {
+                // In front but outside view cone - reduce detail by 1-2 levels
+                for (let i = 0; i < this.LOD_LEVELS.length; i++) {
+                    if (distance < this.LOD_LEVELS[i].distance) {
+                        newLodLevel = Math.min(i + 2, 3); // Reduce detail
+                        break;
+                    }
+                }
+            }
             
             // Only recreate grid if LOD level changed
             if (newLodLevel !== patch.lodLevel) {

src/main.ts

@@ -190,8 +190,8 @@ function drawScene() {
         camera.setRotationY((curRotY += mouseXVel * Config.MOUSE_SENSITIVITY + keyboardRotationY));
         var view = camera.getViewMatrix();
 
-        // Update LOD based on camera position
-        oceanLOD.updateLOD(gl, camera.pos);
+        // Update LOD based on camera position and view direction
+        oceanLOD.updateLOD(gl, camera.pos, camera.target);
 
         var model = mat4.create();
         mat4.identity(model);