Make terrain edges soft, closes #73

source/match/Map.gd

@@ -1,10 +1,14 @@
 @tool
 extends Node3D
 
+# TODO: add editor-only 2nd pass shader to 'Terrain' mesh highlighting map boundries
+
+const EXTRA_MARGIN = 2
+
 @export var size = Vector2(50, 50):
 	set(a_size):
 		size = a_size
-		find_child("Terrain").mesh.size = size
+		find_child("Terrain").mesh.size = size + Vector2(EXTRA_MARGIN, EXTRA_MARGIN) * 2
 		find_child("Terrain").mesh.center_offset = Vector3(size.x, 0.0, size.y) / 2.0
 
 

source/match/Map.tscn

@@ -13,7 +13,7 @@ size = Vector2(1000, 1000)
 [sub_resource type="PlaneMesh" id="PlaneMesh_ypksr"]
 resource_local_to_scene = true
 material = ExtResource("1_81yiw")
-size = Vector2(50, 50)
+size = Vector2(54, 54)
 center_offset = Vector3(25, 0, 25)
 
 [node name="Map" type="Node3D"]
@@ -24,9 +24,11 @@ script = ExtResource("1_1svvv")
 [node name="BlackBackgroundFixingAntiAliasingBug" type="MeshInstance3D" parent="Geometry"]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.1, 0)
 material_override = SubResource("StandardMaterial3D_ve5fg")
+cast_shadow = 0
 mesh = SubResource("PlaneMesh_0fj4w")
 
 [node name="Terrain" type="MeshInstance3D" parent="Geometry" groups=["terrain_navigation_input"]]
+cast_shadow = 0
 mesh = SubResource("PlaneMesh_ypksr")
 
 [node name="SpawnPoints" type="Node3D" parent="."]

source/match/Match.tscn

@@ -76,6 +76,7 @@ render_priority = 2
 shader = ExtResource("13_jo8b7")
 shader_parameter/color = Color(0, 0, 0, 1)
 shader_parameter/texture_units_per_world_unit = 2
+shader_parameter/outer_margin_for_fade_out = 2.0
 shader_parameter/debug_texture_view = false
 shader_parameter/world_visibility_texture = SubResource("ViewportTexture_7yqgo")
 

source/match/maps/BigArena.tscn

@@ -9,7 +9,7 @@
 [sub_resource type="PlaneMesh" id="PlaneMesh_43n1t"]
 resource_local_to_scene = true
 material = ExtResource("2_hmoqb")
-size = Vector2(100, 100)
+size = Vector2(104, 104)
 center_offset = Vector3(50, 0, 50)
 
 [node name="Map" instance=ExtResource("1_c0hq7")]

source/match/maps/PlainAndSimple.tscn

@@ -8,7 +8,7 @@
 [sub_resource type="PlaneMesh" id="PlaneMesh_frqq2"]
 resource_local_to_scene = true
 material = ExtResource("2_sguro")
-size = Vector2(50, 50)
+size = Vector2(54, 54)
 center_offset = Vector3(25, 0, 25)
 
 [node name="Map" instance=ExtResource("1_sqrvi")]

source/shaders/3d/simple_fog_of_war.gdshader

@@ -4,6 +4,7 @@ render_mode unshaded;
 uniform vec4 color : source_color = vec4(vec3(0.0), 1.0);
 uniform sampler2D world_visibility_texture : hint_default_white, filter_linear, repeat_disable;
 uniform int texture_units_per_world_unit = 2;
+uniform float outer_margin_for_fade_out = 2.0;
 uniform bool debug_texture_view = false;
 uniform sampler2D depth_texture : hint_depth_texture;
 
@@ -37,14 +38,15 @@ void fragment()
       INV_VIEW_MATRIX * inverse(PROJECTION_MATRIX) * vec4(normalized_device_coordinates, 1.0);
   world_position.xyz /= world_position.w;
 
-  if (depth == 1.0)
+  if (depth == 1.0) // infinite depth (OpenGL only)
   {
     ALPHA = 1.0;
   }
   else
   {
-    vec2 world_visibility_texture_uv = world_position.xz /
-        vec2(textureSize(world_visibility_texture, 0)) * float(texture_units_per_world_unit);
+    vec2 world_visibility_texture_size_scaled =
+        vec2(textureSize(world_visibility_texture, 0)) / float(texture_units_per_world_unit);
+    vec2 world_visibility_texture_uv = world_position.xz / world_visibility_texture_size_scaled;
     if (world_visibility_texture_uv.x >= 0.0 && world_visibility_texture_uv.x <= 1.0 &&
         world_visibility_texture_uv.y >= 0.0 && world_visibility_texture_uv.y <= 1.0)
     {
@@ -53,9 +55,35 @@ void fragment()
           textureLod(world_visibility_texture, world_visibility_texture_uv, 0.0).r;
       ALPHA = max(ALPHA, 1.0 - transparency_from_world_visibility_texture);
     }
+    else if (
+        outer_margin_for_fade_out > 0.0 &&
+        ((world_position.x < 0.0 && world_position.x >= -outer_margin_for_fade_out) ||
+         (world_position.x > world_visibility_texture_size_scaled.x &&
+          world_position.x <= world_visibility_texture_size_scaled.x + outer_margin_for_fade_out) ||
+         (world_position.z < 0.0 && world_position.z >= -outer_margin_for_fade_out) ||
+         (world_position.z > world_visibility_texture_size_scaled.y &&
+          world_position.z <= world_visibility_texture_size_scaled.y + outer_margin_for_fade_out)))
+    {
+      float max_distance_from_boundary = 0.0 - world_position.x;
+      max_distance_from_boundary = max(
+          max_distance_from_boundary, world_position.x - world_visibility_texture_size_scaled.x);
+      max_distance_from_boundary = max(max_distance_from_boundary, 0.0 - world_position.z);
+      max_distance_from_boundary = max(
+          max_distance_from_boundary, world_position.z - world_visibility_texture_size_scaled.y);
+      float alpha_from_margin =
+          smoothstep(0.0, outer_margin_for_fade_out, max_distance_from_boundary) * 0.2 + 0.8;
+      ALPHA = max(ALPHA, alpha_from_margin);
+
+      float alpha_from_world_visibility_texture = 0.0;
+      alpha_from_world_visibility_texture =
+          1.0 - textureLod(world_visibility_texture, world_visibility_texture_uv, 0.0).r;
+      ALPHA = max(ALPHA, alpha_from_world_visibility_texture);
+
+      ALPHA = min(ALPHA, 1.0);
+    }
     else
     {
-      ALPHA = 0.0;
+      ALPHA = 1.0;
     }
   }
 

tests/manual/TestPlayerVsAI.tscn

@@ -33,6 +33,7 @@ render_priority = 1
 shader = ExtResource("12_cnst8")
 shader_parameter/color = Color(0, 0, 0, 1)
 shader_parameter/texture_units_per_world_unit = 2
+shader_parameter/outer_margin_for_fade_out = 2.0
 shader_parameter/debug_texture_view = false
 shader_parameter/world_visibility_texture = SubResource("ViewportTexture_v46ss")
 

tests/manual/maps/NonQuadratic.tscn

@@ -6,7 +6,7 @@
 [sub_resource type="PlaneMesh" id="PlaneMesh_0gpme"]
 resource_local_to_scene = true
 material = ExtResource("2_cl6u2")
-size = Vector2(100, 50)
+size = Vector2(104, 54)
 center_offset = Vector3(50, 0, 25)
 
 [node name="Map" instance=ExtResource("1_ame05")]