Material / shader to allow for multiple terrain textures

assets/textures/terrain/dirt.png.import

@@ -1,35 +1,14 @@
 [remap]
 
-importer="texture"
+importer="image"
-type="CompressedTexture2D"
+type="Image"
 uid="uid://bpo7mkr6sctqr"
-path.s3tc="res://.godot/imported/dirt.png-67313fa97fa5b9369bec725f203ba6a9.s3tc.ctex"
+path="res://.godot/imported/dirt.png-67313fa97fa5b9369bec725f203ba6a9.image"
-metadata={
-"imported_formats": ["s3tc_bptc"],
-"vram_texture": true
-}
 
 [deps]
 
 source_file="res://assets/textures/terrain/dirt.png"
-dest_files=["res://.godot/imported/dirt.png-67313fa97fa5b9369bec725f203ba6a9.s3tc.ctex"]
+dest_files=["res://.godot/imported/dirt.png-67313fa97fa5b9369bec725f203ba6a9.image"]
 
 [params]
 
-compress/mode=2
-compress/high_quality=false
-compress/lossy_quality=0.7
-compress/hdr_compression=1
-compress/normal_map=0
-compress/channel_pack=0
-mipmaps/generate=true
-mipmaps/limit=-1
-roughness/mode=0
-roughness/src_normal=""
-process/fix_alpha_border=true
-process/premult_alpha=false
-process/normal_map_invert_y=false
-process/hdr_as_srgb=false
-process/hdr_clamp_exposure=false
-process/size_limit=0
-detect_3d/compress_to=0

assets/textures/terrain/grass.png.import

@@ -1,35 +1,14 @@
 [remap]
 
-importer="texture"
+importer="image"
-type="CompressedTexture2D"
+type="Image"
 uid="uid://b0jp1dyxugbr7"
-path.s3tc="res://.godot/imported/grass.png-aff98023336e7c812cce14c63596cfa6.s3tc.ctex"
+path="res://.godot/imported/grass.png-aff98023336e7c812cce14c63596cfa6.image"
-metadata={
-"imported_formats": ["s3tc_bptc"],
-"vram_texture": true
-}
 
 [deps]
 
 source_file="res://assets/textures/terrain/grass.png"
-dest_files=["res://.godot/imported/grass.png-aff98023336e7c812cce14c63596cfa6.s3tc.ctex"]
+dest_files=["res://.godot/imported/grass.png-aff98023336e7c812cce14c63596cfa6.image"]
 
 [params]
 
-compress/mode=2
-compress/high_quality=false
-compress/lossy_quality=0.7
-compress/hdr_compression=1
-compress/normal_map=0
-compress/channel_pack=0
-mipmaps/generate=true
-mipmaps/limit=-1
-roughness/mode=0
-roughness/src_normal=""
-process/fix_alpha_border=true
-process/premult_alpha=false
-process/normal_map_invert_y=false
-process/hdr_as_srgb=false
-process/hdr_clamp_exposure=false
-process/size_limit=0
-detect_3d/compress_to=0

assets/textures/terrain/rock.png.import

@@ -1,35 +1,14 @@
 [remap]
 
-importer="texture"
+importer="image"
-type="CompressedTexture2D"
+type="Image"
 uid="uid://dqyqg6yt7yk3k"
-path.s3tc="res://.godot/imported/rock.png-6fd2e985e4c17866aa31a92f6096a3ad.s3tc.ctex"
+path="res://.godot/imported/rock.png-6fd2e985e4c17866aa31a92f6096a3ad.image"
-metadata={
-"imported_formats": ["s3tc_bptc"],
-"vram_texture": true
-}
 
 [deps]
 
 source_file="res://assets/textures/terrain/rock.png"
-dest_files=["res://.godot/imported/rock.png-6fd2e985e4c17866aa31a92f6096a3ad.s3tc.ctex"]
+dest_files=["res://.godot/imported/rock.png-6fd2e985e4c17866aa31a92f6096a3ad.image"]
 
 [params]
 
-compress/mode=2
-compress/high_quality=false
-compress/lossy_quality=0.7
-compress/hdr_compression=1
-compress/normal_map=0
-compress/channel_pack=0
-mipmaps/generate=true
-mipmaps/limit=-1
-roughness/mode=0
-roughness/src_normal=""
-process/fix_alpha_border=true
-process/premult_alpha=false
-process/normal_map_invert_y=false
-process/hdr_as_srgb=false
-process/hdr_clamp_exposure=false
-process/size_limit=0
-detect_3d/compress_to=0

assets/textures/terrain/sand.png.import

@@ -1,35 +1,14 @@
 [remap]
 
-importer="texture"
+importer="image"
-type="CompressedTexture2D"
+type="Image"
 uid="uid://bkwjxg6g2itag"
-path.s3tc="res://.godot/imported/sand.png-451c9e51968306b5331529d9113b3e49.s3tc.ctex"
+path="res://.godot/imported/sand.png-451c9e51968306b5331529d9113b3e49.image"
-metadata={
-"imported_formats": ["s3tc_bptc"],
-"vram_texture": true
-}
 
 [deps]
 
 source_file="res://assets/textures/terrain/sand.png"
-dest_files=["res://.godot/imported/sand.png-451c9e51968306b5331529d9113b3e49.s3tc.ctex"]
+dest_files=["res://.godot/imported/sand.png-451c9e51968306b5331529d9113b3e49.image"]
 
 [params]
 
-compress/mode=2
-compress/high_quality=false
-compress/lossy_quality=0.7
-compress/hdr_compression=1
-compress/normal_map=0
-compress/channel_pack=0
-mipmaps/generate=true
-mipmaps/limit=-1
-roughness/mode=0
-roughness/src_normal=""
-process/fix_alpha_border=true
-process/premult_alpha=false
-process/normal_map_invert_y=false
-process/hdr_as_srgb=false
-process/hdr_clamp_exposure=false
-process/size_limit=0
-detect_3d/compress_to=0

level.tscn

@@ -1,15 +1,12 @@
-[gd_scene load_steps=11 format=3 uid="uid://cmootlmme7yid"]
+[gd_scene load_steps=8 format=3 uid="uid://cmootlmme7yid"]
 
-[ext_resource type="Texture2D" uid="uid://b0jp1dyxugbr7" path="res://assets/textures/terrain/grass.png" id="1_1tbeu"]
 [ext_resource type="PackedScene" uid="uid://daihc7acaxfns" path="res://character.tscn" id="1_ymqel"]
-[ext_resource type="Texture2D" uid="uid://dqyqg6yt7yk3k" path="res://assets/textures/terrain/rock.png" id="2_glt4b"]
 [ext_resource type="Script" path="res://CameraController.cs" id="2_wn05g"]
-[ext_resource type="Texture2D" uid="uid://bpo7mkr6sctqr" path="res://assets/textures/terrain/dirt.png" id="3_kwxfa"]
+[ext_resource type="Material" uid="uid://doe8owgx4jeu1" path="res://terrain/terrain_material.tres" id="4_edbby"]
 [ext_resource type="PackedScene" uid="uid://c732i0mrp6klk" path="res://objects/tree_oak_round.tscn" id="6_xbyit"]
 [ext_resource type="PackedScene" uid="uid://2giwj61d3h66" path="res://objects/tree_oak_tall.tscn" id="7_wghwq"]
 [ext_resource type="PackedScene" uid="uid://b65o2rhp8qx74" path="res://objects/tree_oak_cone.tscn" id="8_iglt6"]
 [ext_resource type="Script" path="res://terrain/Terrain.cs" id="9_rniku"]
-[ext_resource type="Texture2D" uid="uid://bkwjxg6g2itag" path="res://assets/textures/terrain/sand.png" id="10_70ou1"]
 
 [node name="Level" type="Node3D"]
 
@@ -39,7 +36,7 @@ far = 50.0
 [node name="Terrain" type="StaticBody3D" parent="."]
 collision_mask = 0
 script = ExtResource("9_rniku")
-Textures = [ExtResource("1_1tbeu"), ExtResource("3_kwxfa"), ExtResource("10_70ou1"), ExtResource("2_glt4b")]
+Material = ExtResource("4_edbby")
 Tiles = {}
 
 [node name="Trees" type="Node3D" parent="."]

terrain/Terrain+Editing.cs

@@ -121,7 +121,6 @@ public partial class Terrain
 			mesh.ClearSurfaces();
 			mesh.SurfaceBegin(Mesh.PrimitiveType.Lines);
 
-
 			void AddLine(Vector3 start, Vector3 end) {
 				mesh.SurfaceAddVertex(start);
 				mesh.SurfaceAddVertex(end);
@@ -139,12 +138,10 @@ public partial class Terrain
 				var corners = GetCornersPosition(hover);
 				var margin  = 0.1f;
 				mesh.SurfaceSetColor(Colors.Black);
-				AddQuad(
+				AddQuad(corners.TopLeft     + new Vector3(-margin, 0, -margin),
-					corners.TopLeft     + new Vector3(-margin, 0, -margin),
+				        corners.TopRight    + new Vector3(+margin, 0, -margin),
-					corners.TopRight    + new Vector3(+margin, 0, -margin),
+				        corners.BottomLeft  + new Vector3(-margin, 0, +margin),
-					corners.BottomLeft  + new Vector3(-margin, 0, +margin),
+				        corners.BottomRight + new Vector3(+margin, 0, +margin));
-					corners.BottomRight + new Vector3(+margin, 0, +margin)
-				);
 			}
 
 			mesh.SurfaceSetColor(Colors.Blue);

terrain/Terrain.cs

@@ -4,7 +4,7 @@ public partial class Terrain
 	[Export] public Vector2I Size { get; set; } = new(64, 64);
 	[Export] public float TileSize { get; set; } = 2.0f;
 
-	[Export] public Godot.Collections.Array<Texture2D> Textures { get; set; }
+	[Export] public ShaderMaterial Material { get; set; }
 
 	// If value at position non-existant => [ 0, 0, 0, 0 ]
 	// If value at position is float     => [ v, v, v, v ]
@@ -13,7 +13,6 @@ public partial class Terrain
 
 
 	Material _editToolMaterial;
-	Material _terrainMaterial;
 	public override void _Ready()
 	{
 		_editToolMaterial = new StandardMaterial3D {
@@ -23,10 +22,6 @@ public partial class Terrain
 			NoDepthTest   = true,
 		};
 
-		_terrainMaterial = new StandardMaterial3D {
-			AlbedoTexture = Textures?.FirstOrDefault(),
-		};
-
 		UpdateMeshAndShape();
 	}
 
@@ -143,6 +138,7 @@ public partial class Terrain
 			AddPoint(v3, uv3);
 		}
 
+		var rnd = new Random();
 		for (var x = 0; x < Size.X; x++)
 			for (var z = 0; z < Size.Y; z++) {
 				var corners = GetCornersPosition(new(x, z));
@@ -153,6 +149,7 @@ public partial class Terrain
 				var minDiff = Abs(sorted[0].Value.Y - sorted[2].Value.Y); // Difference between lowest and 3rd lowest point.
 				var maxDiff = Abs(sorted[3].Value.Y - sorted[1].Value.Y); // Difference between highest and 3rd highest point.
 
+				mesh.SurfaceSetUV2(new(rnd.Next(4), 0.0f));
 				var first = sorted[(minDiff > maxDiff) ? 0 : 3].Corner;
 				if (first is Corner.TopLeft or Corner.BottomRight) {
 					AddTriangle(corners.TopLeft    , new(0.0f, 0.0f),
@@ -172,7 +169,7 @@ public partial class Terrain
 			}
 
 		mesh.SurfaceEnd();
-		mesh.SurfaceSetMaterial(0, _terrainMaterial);
+		mesh.SurfaceSetMaterial(0, Material);
 
 		shape.Data = [.. points];
 	}

terrain/terrain_material.tres

@@ -0,0 +1,15 @@
+[gd_resource type="ShaderMaterial" load_steps=7 format=4 uid="uid://doe8owgx4jeu1"]
+
+[ext_resource type="Shader" path="res://terrain/terrain_shader.gdshader" id="1_mf55c"]
+[ext_resource type="Image" uid="uid://b0jp1dyxugbr7" path="res://assets/textures/terrain/grass.png" id="5_mau31"]
+[ext_resource type="Image" uid="uid://bpo7mkr6sctqr" path="res://assets/textures/terrain/dirt.png" id="6_xc3ue"]
+[ext_resource type="Image" uid="uid://dqyqg6yt7yk3k" path="res://assets/textures/terrain/rock.png" id="7_84wdo"]
+[ext_resource type="Image" uid="uid://bkwjxg6g2itag" path="res://assets/textures/terrain/sand.png" id="8_3fpcn"]
+
+[sub_resource type="Texture2DArray" id="Texture2DArray_3nq13"]
+_images = Array[Image]([ExtResource("5_mau31"), ExtResource("6_xc3ue"), ExtResource("7_84wdo"), ExtResource("8_3fpcn")])
+
+[resource]
+render_priority = 0
+shader = ExtResource("1_mf55c")
+shader_parameter/textures = SubResource("Texture2DArray_3nq13")

terrain/terrain_shader.gdshader

@@ -0,0 +1,12 @@
+shader_type spatial;
+render_mode blend_mix, depth_draw_opaque, cull_back, diffuse_burley, specular_schlick_ggx;
+
+uniform sampler2DArray textures : source_color, filter_linear_mipmap, repeat_enable;
+
+void fragment() {
+	ALBEDO = texture(textures, vec3(UV, UV2.x)).rgb;
+
+	METALLIC  = 0.0;
+	SPECULAR  = 0.5;
+	ROUGHNESS = 1.0;
+}