From 07006cd1ae4dac4fc6afd8cbb2a3b4971573c473 Mon Sep 17 00:00:00 2001
From: MichaelFisher1997 <contact@michaelfisher.tech>
Date: Sun, 3 May 2026 19:49:54 +0100
Subject: [PATCH] fix: polish LOD seam transitions

---
 assets/shaders/vulkan/g_pass.frag      |   2 +-
 assets/shaders/vulkan/terrain.frag     |  11 +-
 assets/shaders/vulkan/terrain.frag.spv | Bin 82940 -> 82848 bytes
 modules/world-lod/src/lod_chunk.zig    |   8 +-
 modules/world-lod/src/lod_mesh.zig     | 145 ++++++++++++++++++++++++-
 5 files changed, 150 insertions(+), 16 deletions(-)

diff --git a/assets/shaders/vulkan/g_pass.frag b/assets/shaders/vulkan/g_pass.frag
index 24895573..1d412c29 100644
--- a/assets/shaders/vulkan/g_pass.frag
+++ b/assets/shaders/vulkan/g_pass.frag
@@ -46,7 +46,7 @@ float lodTransitionNoise(vec2 worldXZ) {
 }
 
 void main() {
-    const float LOD_TRANSITION_WIDTH = 24.0;
+    const float LOD_TRANSITION_WIDTH = 32.0;
     bool isLOD = vTileID < 0 || vMaskRadius > 0.0;
     if (vMaskRadius >= 1.0) {
         float distFromMask = length(vFragPosWorld.xz) - vMaskRadius;
diff --git a/assets/shaders/vulkan/terrain.frag b/assets/shaders/vulkan/terrain.frag
index 4f0520f3..a8319ed2 100644
--- a/assets/shaders/vulkan/terrain.frag
+++ b/assets/shaders/vulkan/terrain.frag
@@ -672,7 +672,7 @@ void main() {
     float debugSkyFill = 0.0;
     float debugBlockLight = clamp(max(vBlockLight.r, max(vBlockLight.g, vBlockLight.b)), 0.0, 1.0);
     float debugOutdoor = baselineOutdoorFactor(vSkyLight);
-    const float LOD_TRANSITION_WIDTH = 24.0;
+    const float LOD_TRANSITION_WIDTH = 32.0;
     const float AO_FADE_DISTANCE = 128.0;
     const float TEXTURE_FADE_START = 32.0;
     const float TEXTURE_FADE_END = 128.0;
@@ -686,12 +686,11 @@ void main() {
     }
 
     if (vMaskRadius >= 1.0) {
-        const float CHUNK_SIZE = 16.0;
         vec2 worldXZ = vFragPosWorld.xz + global.cam_pos.xz;
-        vec2 fragChunk = floor(worldXZ / CHUNK_SIZE);
-        vec2 cameraChunk = floor(global.cam_pos.xz / CHUNK_SIZE);
-        float maskChunks = floor(vMaskRadius / CHUNK_SIZE + 0.5);
-        if (length(fragChunk - cameraChunk) <= maskChunks) discard;
+        float distFromMask = length(vFragPosWorld.xz) - vMaskRadius;
+        float fade = clamp(distFromMask / LOD_TRANSITION_WIDTH, 0.0, 1.0);
+        float ditherThreshold = lodTransitionNoise(worldXZ);
+        if (fade < ditherThreshold) discard;
     }
     
     vec2 tileBase = vec2(mod(float(vTileID), 16.0), floor(float(vTileID) / 16.0)) * (1.0 / 16.0);
diff --git a/assets/shaders/vulkan/terrain.frag.spv b/assets/shaders/vulkan/terrain.frag.spv
index d9e35bcb1cba10fc0deaa02678d40d8acf311378..ced24a4c9f75680c4edd1f74b3b491a4abd026ef 100644
GIT binary patch
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diff --git a/modules/world-lod/src/lod_chunk.zig b/modules/world-lod/src/lod_chunk.zig
index a1650751..9dfe8f7b 100644
--- a/modules/world-lod/src/lod_chunk.zig
+++ b/modules/world-lod/src/lod_chunk.zig
@@ -285,7 +285,7 @@ pub const LODConfig = struct {
 
     /// Fog start position as percentage of LOD radius (0.0-1.0) where fog begins.
     /// Values closer to 0.0 start fog near the player; 1.0 disables fog for that level.
-    fog_start_percent: [LODLevel.count]f32 = .{ 0.5, 0.5, 0.4, 0.3 },
+    fog_start_percent: [LODLevel.count]f32 = .{ 0.55, 0.48, 0.38, 0.28 },
 
     qem_triangle_targets: [LODLevel.count]u32 = .{ 0, 2000, 800, 200 },
 
@@ -393,7 +393,7 @@ pub const LODConfig = struct {
         const self: *LODConfig = @ptrCast(@alignCast(ptr));
         // Keep a small overlap so the chunk ring and LOD ring blend instead of
         // leaving a camera-centered dead zone between them.
-        const overlap_chunks = @max(self.radii[0] - 1, 0);
+        const overlap_chunks = @max(self.radii[0] - 2, 0);
         return @as(f32, @floatFromInt(overlap_chunks)) * @as(f32, @floatFromInt(CHUNK_SIZE_X));
     }
     fn getQEMTargetWrapper(ptr: *anyopaque, lod: LODLevel) u32 {
@@ -498,8 +498,8 @@ test "ILODConfig.calculateMaskRadius" {
         .radii = .{ 16, 40, 80, 160 },
     };
     const interface = config.interface();
-    try std.testing.expectEqual(@as(f32, 240.0), interface.calculateMaskRadius());
+    try std.testing.expectEqual(@as(f32, 224.0), interface.calculateMaskRadius());
 
     config.radii[0] = 32;
-    try std.testing.expectEqual(@as(f32, 496.0), interface.calculateMaskRadius());
+    try std.testing.expectEqual(@as(f32, 480.0), interface.calculateMaskRadius());
 }
diff --git a/modules/world-lod/src/lod_mesh.zig b/modules/world-lod/src/lod_mesh.zig
index dfca8624..cc8e2ecd 100644
--- a/modules/world-lod/src/lod_mesh.zig
+++ b/modules/world-lod/src/lod_mesh.zig
@@ -32,6 +32,7 @@ const encodeNormal = rhi_types.encodeNormal;
 const encodeMeta = rhi_types.encodeMeta;
 const encodeBlocklight = rhi_types.encodeBlocklight;
 const QuadricSimplifier = @import("world-meshing").meshing.quadric_simplifier.QuadricSimplifier;
+const engine_core = @import("engine-core");
 const log = @import("engine-core").log;
 const lod_seam = @import("lod_seam.zig");
 
@@ -197,15 +198,16 @@ pub const LODMesh = struct {
 
         var vertices = std.ArrayListUnmanaged(Vertex).empty;
         defer vertices.deinit(self.allocator);
+        const diag_enabled = engine_core.envFlag("ZIGCRAFT_LOD_DIAG", false);
 
         var gz: u32 = 0;
         while (gz + 1 < data.width) : (gz += 1) {
             var gx: u32 = 0;
             while (gx + 1 < data.width) : (gx += 1) {
-                const h00 = data.heightmap[gx + gz * data.width];
-                const h10 = data.heightmap[(gx + 1) + gz * data.width];
-                const h01 = data.heightmap[gx + (gz + 1) * data.width];
-                const h11 = data.heightmap[(gx + 1) + (gz + 1) * data.width];
+                const h00 = stitchedHeight(data, gx, gz);
+                const h10 = stitchedHeight(data, gx + 1, gz);
+                const h01 = stitchedHeight(data, gx, gz + 1);
+                const h11 = stitchedHeight(data, gx + 1, gz + 1);
 
                 const c00 = data.colors[gx + gz * data.width];
                 const c10 = data.colors[(gx + 1) + gz * data.width];
@@ -247,6 +249,13 @@ pub const LODMesh = struct {
             }
         }
 
+        if (diag_enabled) {
+            const max_adjust = maxStitchedHeightAdjustment(data);
+            if (max_adjust > 0.25) {
+                log.log.info("LOD_SEAM_DIAG lod={} origin=({}, {}) max_edge_adjust={d:.2}", .{ @intFromEnum(self.lod_level), world_x, world_z, max_adjust });
+            }
+        }
+
         // Store pending vertices
         self.mutex.lock();
         defer self.mutex.unlock();
@@ -705,10 +714,69 @@ fn blockForLODCell(data: *const LODSimplifiedData, gx: u32, gz: u32) BlockType {
 }
 
 fn blockForLODQuad(data: *const LODSimplifiedData, gx: u32, gz: u32) BlockType {
-    if (averageWaterCoverage(data, gx, gz) >= 0.25) return .water;
+    const water_coverage = averageWaterCoverage(data, gx, gz);
+    if (water_coverage >= 0.35) return .water;
+    if (water_coverage > 0.0 and representativeWaterDepth(data, gx, gz) >= 1.5) return .water;
+    return representativeSurfaceBlock(data, gx, gz);
+}
+
+fn representativeSurfaceBlock(data: *const LODSimplifiedData, gx: u32, gz: u32) BlockType {
+    const x0 = @min(gx, data.width - 1);
+    const z0 = @min(gz, data.width - 1);
+    const x1 = @min(gx + 1, data.width - 1);
+    const z1 = @min(gz + 1, data.width - 1);
+    const indices = [_]u32{
+        x0 + z0 * data.width,
+        x1 + z0 * data.width,
+        x0 + z1 * data.width,
+        x1 + z1 * data.width,
+    };
+
+    var best_block: BlockType = .air;
+    var best_count: u32 = 0;
+    for (indices) |idx| {
+        const block = if (data.material_layers[idx].surface != .air) data.material_layers[idx].surface else if (data.top_blocks[idx] != .air) data.top_blocks[idx] else data.biomes[idx].getSurfaceBlock();
+        if (block == .air or block == .water) continue;
+
+        var count: u32 = 0;
+        for (indices) |other_idx| {
+            const other = if (data.material_layers[other_idx].surface != .air) data.material_layers[other_idx].surface else if (data.top_blocks[other_idx] != .air) data.top_blocks[other_idx] else data.biomes[other_idx].getSurfaceBlock();
+            if (other == block) count += 1;
+        }
+        if (count > best_count) {
+            best_block = block;
+            best_count = count;
+        }
+    }
+
+    if (best_block != .air) return best_block;
     return blockForLODCell(data, gx, gz);
 }
 
+fn representativeWaterDepth(data: *const LODSimplifiedData, gx: u32, gz: u32) f32 {
+    const x0 = @min(gx, data.width - 1);
+    const z0 = @min(gz, data.width - 1);
+    const x1 = @min(gx + 1, data.width - 1);
+    const z1 = @min(gz + 1, data.width - 1);
+    const indices = [_]u32{
+        x0 + z0 * data.width,
+        x1 + z0 * data.width,
+        x0 + z1 * data.width,
+        x1 + z1 * data.width,
+    };
+
+    var weighted_depth: f32 = 0.0;
+    var coverage: f32 = 0.0;
+    for (indices) |idx| {
+        const water = data.water[idx];
+        if (!water.is_surface) continue;
+        weighted_depth += water.depth * water.coverage;
+        coverage += water.coverage;
+    }
+    if (coverage <= 0.001) return 0.0;
+    return weighted_depth / coverage;
+}
+
 fn selectCellMaterial(data: *const LODSimplifiedData, atlas: *const TextureAtlas, gx: u32, gz: u32) TextureAtlas.BlockTiles {
     const top_block = blockForLODQuad(data, gx, gz);
     const side_block = sideBlockForLODQuad(data, gx, gz, top_block);
@@ -793,6 +861,37 @@ fn averageWaterCoverage(data: *const LODSimplifiedData, gx: u32, gz: u32) f32 {
     return (c00 + c10 + c01 + c11) * 0.25;
 }
 
+fn stitchedHeight(data: *const LODSimplifiedData, gx: u32, gz: u32) f32 {
+    const height = data.getHeight(gx, gz);
+    if (data.width < 5) return height;
+
+    const blend_cells: u32 = 2;
+    const max_idx = data.width - 1;
+    const edge_dist = @min(@min(gx, gz), @min(max_idx - gx, max_idx - gz));
+    if (edge_dist >= blend_cells) return height;
+
+    const coarse_x = @min(((gx + 1) / 2) * 2, max_idx);
+    const coarse_z = @min(((gz + 1) / 2) * 2, max_idx);
+    const coarse_height = data.getHeight(coarse_x, coarse_z);
+    const edge_weight = 1.0 - (@as(f32, @floatFromInt(edge_dist)) / @as(f32, @floatFromInt(blend_cells)));
+    const blend = edge_weight * 0.35;
+    return height * (1.0 - blend) + coarse_height * blend;
+}
+
+fn maxStitchedHeightAdjustment(data: *const LODSimplifiedData) f32 {
+    if (data.width < 5) return 0.0;
+
+    var max_adjust: f32 = 0.0;
+    var i: u32 = 0;
+    while (i < data.width) : (i += 1) {
+        max_adjust = @max(max_adjust, @abs(data.getHeight(i, 0) - stitchedHeight(data, i, 0)));
+        max_adjust = @max(max_adjust, @abs(data.getHeight(i, data.width - 1) - stitchedHeight(data, i, data.width - 1)));
+        max_adjust = @max(max_adjust, @abs(data.getHeight(0, i) - stitchedHeight(data, 0, i)));
+        max_adjust = @max(max_adjust, @abs(data.getHeight(data.width - 1, i) - stitchedHeight(data, data.width - 1, i)));
+    }
+    return max_adjust;
+}
+
 // Helper functions for unpacking colors
 fn unpackR(color: u32) f32 {
     return @as(f32, @floatFromInt((color >> 16) & 0xFF)) / 255.0;
@@ -1545,6 +1644,42 @@ test "buildFromSimplifiedData promotes mixed water cells to water material" {
     try std.testing.expect(found_floor_side);
 }
 
+test "blockForLODQuad uses representative non-water surface" {
+    const allocator = std.testing.allocator;
+    var data = try LODSimplifiedData.init(allocator, .lod1);
+    defer data.deinit();
+
+    for (0..data.width * data.width) |i| {
+        data.biomes[i] = .plains;
+        data.top_blocks[i] = .grass;
+        data.material_layers[i] = .{
+            .surface = .grass,
+            .subsurface = .dirt,
+            .foundation = .stone,
+        };
+    }
+
+    data.material_layers[1].surface = .stone;
+    data.material_layers[data.width].surface = .stone;
+    data.material_layers[data.width + 1].surface = .stone;
+
+    try std.testing.expectEqual(BlockType.stone, blockForLODQuad(&data, 0, 0));
+}
+
+test "stitchedHeight blends boundary points toward coarse grid" {
+    const allocator = std.testing.allocator;
+    var data = try LODSimplifiedData.init(allocator, .lod1);
+    defer data.deinit();
+
+    for (0..data.width * data.width) |i| {
+        data.heightmap[i] = 10.0;
+    }
+    data.setHeight(0, 1, 100.0);
+
+    try std.testing.expect(stitchedHeight(&data, 0, 1) < 100.0);
+    try std.testing.expectEqual(@as(f32, 10.0), stitchedHeight(&data, 4, 4));
+}
+
 test "buildFromSimplifiedData uses averaged color tile for far LOD tops" {
     const allocator = std.testing.allocator;
     const MAX_BLOCK_TYPES = world_core.MAX_BLOCK_TYPES;