Try building an island with Crocotile

assets/island_model/.gitattributes

@@ -0,0 +1 @@
+*.obj filter=lfs diff=lfs merge=lfs -text

assets/island_model/island.mtl

@@ -0,0 +1,9 @@
+newmtl material0
+Ka 1.000000 1.000000 1.000000
+Kd 1.000000 1.000000 1.000000
+Ks 0.000000 0.000000 0.000000
+Tr 0.000000
+illum 0
+Ns 0.000000
+map_Kd texture_0.png
+map_d texture_0.png

assets/island_model/island.obj.import

@@ -0,0 +1,21 @@
+[remap]
+
+importer="wavefront_obj"
+importer_version=1
+type="Mesh"
+uid="uid://c8knvy5ras8jo"
+path="res://.godot/imported/island.obj-4a819d853cd74bb4b42ee411b2154ac2.mesh"
+
+[deps]
+
+files=["res://.godot/imported/island.obj-4a819d853cd74bb4b42ee411b2154ac2.mesh"]
+
+source_file="res://assets/island_model/island.obj"
+dest_files=["res://.godot/imported/island.obj-4a819d853cd74bb4b42ee411b2154ac2.mesh", "res://.godot/imported/island.obj-4a819d853cd74bb4b42ee411b2154ac2.mesh"]
+
+[params]
+
+generate_tangents=true
+scale_mesh=Vector3(1, 1, 1)
+offset_mesh=Vector3(0, 0, 0)
+optimize_mesh=true

assets/island_model/texture_0.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ebyf8q6s6yuj"
+path.s3tc="res://.godot/imported/texture_0.png-3885559f1cd03962459520e5a01eb4b2.s3tc.ctex"
+path.etc2="res://.godot/imported/texture_0.png-3885559f1cd03962459520e5a01eb4b2.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc", "etc2"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/island_model/texture_0.png"
+dest_files=["res://.godot/imported/texture_0.png-3885559f1cd03962459520e5a01eb4b2.s3tc.ctex", "res://.godot/imported/texture_0.png-3885559f1cd03962459520e5a01eb4b2.etc2.ctex"]
+
+[params]
+
+compress/mode=2
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+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

island/Island.tscn

@@ -1,6 +1,7 @@
-[gd_scene load_steps=7 format=3 uid="uid://bg88gc1w1gw5m"]
+[gd_scene load_steps=8 format=3 uid="uid://bg88gc1w1gw5m"]
 
 [ext_resource type="Texture2D" uid="uid://bdoifsf6k0qb8" path="res://assets/water_tile.png" id="1_w6ara"]
+[ext_resource type="ArrayMesh" uid="uid://c8knvy5ras8jo" path="res://assets/island_model/island.obj" id="2_r00hx"]
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_i4xeb"]
 shading_mode = 0
@@ -35,6 +36,9 @@ sky = SubResource("Sky_j6hso")
 [node name="Sea" type="MeshInstance3D" parent="."]
 mesh = SubResource("PlaneMesh_4ibso")
 
+[node name="Island" type="MeshInstance3D" parent="."]
+mesh = ExtResource("2_r00hx")
+
 [node name="WorldEnvironment" type="WorldEnvironment" parent="."]
 environment = SubResource("Environment_302o8")