copy from thegates-jam repo

levels/portal/foam_mask.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c7iebe8trdpbv"
+path.s3tc="res://.godot/imported/foam_mask.png-d06420bfbdb9539f5c6e4e675088d913.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://levels/portal/foam_mask.png"
+dest_files=["res://.godot/imported/foam_mask.png-d06420bfbdb9539f5c6e4e675088d913.s3tc.ctex"]
+
+[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

levels/portal/portal.gd

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+extends Node3D
+
+signal portal_entered(url: String)
+
+@export var url: String
+
+
+func _on_portal_entered(body):
+	if not body is CharacterBody3D: return
+	await get_tree().create_timer(0.2).timeout
+	print("portal_entered: " + url)
+	portal_entered.emit(url)
+
+
+func shut_down(_body) -> void:
+	$Portal/MeshInstance3D.visible = false
+	$Portal/MeshInstance3D2.visible = false
+	$Portal/OmniLight3D.visible = false
+	$Portal/CollisionShape3D.set_deferred("disabled", true)

levels/portal/portal.gdshader

@@ -0,0 +1,50 @@
+shader_type spatial;
+render_mode unshaded;
+
+uniform sampler2D caustics_texture : hint_default_black;
+uniform sampler2D color_gradient : source_color;
+uniform sampler2D distort_noise : hint_default_black;
+
+uniform float flow_speed = 0.3;
+uniform float vignette_size = 0.3;
+uniform float vignette_blend = 0.1;
+uniform float distort_strength = 0.1;
+uniform float transparency = 0.5;
+
+
+vec2 polar_coordinates(vec2 uv, vec2 center, float zoom, float repeat)
+{
+	vec2 dir = uv - center;
+	highp float radius = length(dir) * 2.0;
+	highp float angle = atan(dir.y, dir.x) / TAU;
+	return mod(vec2(radius * zoom, angle * repeat), 1.0);
+}
+
+void vertex()
+{
+	float dn = texture(distort_noise, UV + TIME * 0.1).r;
+	VERTEX.y += dn * 0.1;
+}
+
+void fragment()
+{
+	// Polar UVs + Noise for caustics
+	vec2 base_uv = UV;
+	float dn = texture(distort_noise, UV + TIME * 0.1).r;
+	base_uv += dn * distort_strength;
+	base_uv -= distort_strength / 2.0;
+	highp vec2 polar_uv = polar_coordinates(base_uv, vec2(0.5), 1.0, 1.0);
+	polar_uv.x -= TIME * flow_speed;
+	float caus = texture(caustics_texture, polar_uv).r;
+	
+	// Fade out caustics
+	float cd = distance(UV, vec2(0.5));
+	float vign = 1.0 - smoothstep(vignette_size, vignette_size + vignette_blend, cd);
+	
+	// Color the caustics
+	float grad_uv = caus * vign;
+	vec3 color = texture(color_gradient, vec2(grad_uv)).rgb;
+	
+	ALBEDO = color;
+	ALPHA = transparency;
+}

levels/portal/portal.tscn

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+[gd_scene load_steps=9 format=3 uid="uid://dykqq00uscsiy"]
+
+[ext_resource type="Script" path="res://levels/portal/portal.gd" id="1_4deld"]
+[ext_resource type="Material" uid="uid://ca0wtj0y4axjm" path="res://levels/portal/portal.material" id="2_yk1uj"]
+[ext_resource type="PackedScene" uid="uid://b8hsfhawld5dg" path="res://addons/kenney_platformer_kit/doorOpen.glb" id="3_u08r8"]
+
+[sub_resource type="PlaneMesh" id="PlaneMesh_uqi57"]
+material = ExtResource("2_yk1uj")
+size = Vector2(3.585, 1.63)
+
+[sub_resource type="BoxShape3D" id="BoxShape3D_gs3cv"]
+size = Vector3(0.3, 3.585, 1.63)
+
+[sub_resource type="Animation" id="Animation_tc7hl"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("OmniLight3D:light_energy")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [3.141]
+}
+
+[sub_resource type="Animation" id="Animation_ea30s"]
+resource_name = "idle"
+length = 2.0
+loop_mode = 1
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("OmniLight3D:light_energy")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 1, 2),
+"transitions": PackedFloat32Array(1, 1, 1),
+"update": 0,
+"values": [5.0, 2.5, 5.0]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_kfovg"]
+_data = {
+"RESET": SubResource("Animation_tc7hl"),
+"idle": SubResource("Animation_ea30s")
+}
+
+[node name="Portal" type="Node3D"]
+script = ExtResource("1_4deld")
+
+[node name="Portal" type="Area3D" parent="."]
+transform = Transform3D(-4.37114e-08, 0, 1, 0, 1, 0, -1, 0, -4.37114e-08, 0, 0, 0)
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="Portal"]
+transform = Transform3D(-4.37114e-08, -1, 0, 1, -4.37114e-08, 0, 0, 0, 1, 0, 1.79371, 0)
+mesh = SubResource("PlaneMesh_uqi57")
+
+[node name="MeshInstance3D2" type="MeshInstance3D" parent="Portal"]
+transform = Transform3D(4.37114e-08, 1, 8.74228e-08, 1, -4.37114e-08, 0, 3.82137e-15, 8.74228e-08, -1, 0, 1.79371, 0)
+mesh = SubResource("PlaneMesh_uqi57")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="Portal"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1.79371, 0)
+shape = SubResource("BoxShape3D_gs3cv")
+
+[node name="OmniLight3D" type="OmniLight3D" parent="Portal"]
+transform = Transform3D(-4.37114e-08, 0, -1, 0, 1, 0, 1, 0, -4.37114e-08, 0, 1.751, 0)
+light_color = Color(0.156863, 0.513726, 0.988235, 1)
+light_energy = 3.141
+omni_range = 9.48185
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="Portal"]
+libraries = {
+"": SubResource("AnimationLibrary_kfovg")
+}
+autoplay = "idle"
+
+[node name="doorOpen2" parent="." instance=ExtResource("3_u08r8")]
+
+[connection signal="body_entered" from="Portal" to="." method="_on_portal_entered"]