Add Demo files

project/node_3d.tscn

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+[gd_scene load_steps=6 format=3 uid="uid://cjhjp1l7hn516"]
+
+[sub_resource type="Gradient" id="Gradient_5bi8m"]
+offsets = PackedFloat32Array(0.2, 1)
+colors = PackedColorArray(1, 1, 1, 1, 0, 0, 0, 1)
+
+[sub_resource type="FastNoiseLite" id="FastNoiseLite_tyq11"]
+noise_type = 2
+frequency = 0.03
+cellular_jitter = 3.0
+cellular_return_type = 0
+domain_warp_enabled = true
+domain_warp_type = 1
+domain_warp_amplitude = 50.0
+domain_warp_fractal_type = 2
+domain_warp_fractal_lacunarity = 1.5
+domain_warp_fractal_gain = 1.0
+
+[sub_resource type="NoiseTexture2D" id="NoiseTexture2D_umsef"]
+seamless = true
+color_ramp = SubResource("Gradient_5bi8m")
+noise = SubResource("FastNoiseLite_tyq11")
+
+[sub_resource type="Terrain3DMaterial" id="Terrain3DMaterial_kfm7p"]
+_shader_parameters = {
+"blend_sharpness": 0.87,
+"height_blending": true,
+"macro_variation1": Color(1, 1, 1, 1),
+"macro_variation2": Color(1, 1, 1, 1),
+"noise1_angle": 0.0,
+"noise1_offset": Vector2(0.5, 0.5),
+"noise1_scale": 0.04,
+"noise2_scale": 0.076,
+"noise3_scale": 0.225,
+"noise_texture": SubResource("NoiseTexture2D_umsef"),
+"vertex_normals_distance": 128.0
+}
+world_background = 0
+show_checkered = true
+
+[sub_resource type="Terrain3DTextureList" id="Terrain3DTextureList_xap50"]
+
+[node name="Node3D" type="Node3D"]
+
+[node name="Terrain3D" type="Terrain3D" parent="."]
+storage_directory = "res://terrain"
+material = SubResource("Terrain3DMaterial_kfm7p")
+texture_list = SubResource("Terrain3DTextureList_xap50")