Add 3D physics interpolation demo

Demonstrate first person shooter and third person shooter cameras.

Author: lawnjelly

3d/physics_interpolation_3d/.editorconfig

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+root = true
+
+[*]
+charset = utf-8

3d/physics_interpolation_3d/box.tscn

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+[gd_scene load_steps=4 format=3 uid="uid://cvgxw8nq67xxm"]
+
+[sub_resource type="BoxShape3D" id="BoxShape3D_pq8q7"]
+
+[sub_resource type="BoxMesh" id="BoxMesh_pyidc"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_oq5cr"]
+albedo_color = Color(0.5544661, 0.39379695, 0.15444939, 1)
+
+[node name="Box" type="RigidBody3D"]
+mass = 10.0
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("BoxShape3D_pq8q7")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+mesh = SubResource("BoxMesh_pyidc")
+surface_material_override/0 = SubResource("StandardMaterial3D_oq5cr")

3d/physics_interpolation_3d/bullet.gd

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+extends RigidBody3D
+
+# How many ticks the bullet should last for.
+const _max_life = 100
+
+# Scale the bullet in over a tick so it doesn't appear out of nowhere.
+const _appearance_life = 1
+
+# The current lifetime tick of the bullet.
+var _life = 0
+
+var _enabled = false
+
+func _ready() -> void:
+	$CollisionShape3D.disabled = true
+
+func _physics_process(_delta: float) -> void:
+	# Start with physics collision disabled until the first tick.
+	if !_enabled:
+		$CollisionShape3D.disabled = false
+		_enabled = true
+
+	# Bullet gets older.
+	_life += 1
+	
+	# How many ticks do we have left?
+	var life_left = _max_life - _life
+	
+	# Scaling so the bullet goes from zero to full size during first appearance.
+	var appearance_fract = min(float (_life) / float (_appearance_life), 1.0)
+	
+	# Scale the size of the bullet so it fades towards end of life.
+	var fract = float (life_left) / float (_max_life)
+	
+	# Apply the appearance scaling.
+	fract *= appearance_fract
+	
+	# Ensure scale is never zero, just in case the engine doesn't like zero scale.
+	fract = max(fract, 0.0001)
+	
+	$Scaler.scale = Vector3(fract, fract, fract)
+	
+	# If we've reached the end queue for freeing,
+	# the engine will clear up the bullet.
+	if _life >= _max_life:
+		queue_free()

3d/physics_interpolation_3d/bullet.gd.uid

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+uid://dohdjr8ilotkr

3d/physics_interpolation_3d/bullet.tscn

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+[gd_scene load_steps=12 format=3 uid="uid://2r5wc1n0ybju"]
+
+[ext_resource type="Script" uid="uid://dohdjr8ilotkr" path="res://bullet.gd" id="1_v7oki"]
+[ext_resource type="Texture2D" uid="uid://b70s43gn8c3kx" path="res://spark_particle2.png" id="2_v8qja"]
+
+[sub_resource type="PhysicsMaterial" id="PhysicsMaterial_v8qja"]
+bounce = 0.61
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_rtl8c"]
+radius = 0.2
+
+[sub_resource type="Gradient" id="Gradient_v8qja"]
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_t4vbm"]
+gradient = SubResource("Gradient_v8qja")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_v7oki"]
+direction = Vector3(0, 1, 0)
+initial_velocity_max = 1.0
+gravity = Vector3(0, 1, 0)
+scale_min = 0.19999999
+color_ramp = SubResource("GradientTexture1D_t4vbm")
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_t4vbm"]
+transparency = 1
+albedo_texture = ExtResource("2_v8qja")
+
+[sub_resource type="QuadMesh" id="QuadMesh_rtl8c"]
+material = SubResource("StandardMaterial3D_t4vbm")
+size = Vector2(0.2, 0.2)
+
+[sub_resource type="SphereMesh" id="SphereMesh_v7oki"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_v7oki"]
+albedo_color = Color(0.43164876, 0.5731902, 0.5013925, 1)
+metallic = 1.0
+
+[node name="Bullet" type="RigidBody3D"]
+physics_material_override = SubResource("PhysicsMaterial_v8qja")
+script = ExtResource("1_v7oki")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("SphereShape3D_rtl8c")
+
+[node name="GPUParticles3D" type="GPUParticles3D" parent="."]
+transform_align = 1
+process_material = SubResource("ParticleProcessMaterial_v7oki")
+draw_pass_1 = SubResource("QuadMesh_rtl8c")
+
+[node name="Scaler" type="Node3D" parent="."]
+transform = Transform3D(0.001, 0, 0, 0, 0.001, 0, 0, 0, 0.001, 0, 0, 0)
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="Scaler"]
+transform = Transform3D(0.4, 0, 0, 0, 0.4, 0, 0, 0, 0.4, 0, 0, 0)
+mesh = SubResource("SphereMesh_v7oki")
+skeleton = NodePath("../..")
+surface_material_override/0 = SubResource("StandardMaterial3D_v7oki")

3d/physics_interpolation_3d/icon.png.import

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+type="CompressedTexture2D"
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+}
+
+[deps]
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+source_file="res://icon.png"
+dest_files=["res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.s3tc.ctex"]
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+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
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+mipmaps/generate=true
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+process/channel_remap/red=0
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+process/channel_remap/alpha=3
+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

3d/physics_interpolation_3d/icon.svg

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cb05v27t8vx5t"
+path.s3tc="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
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+[deps]
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+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.s3tc.ctex"]
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+[params]
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+compress/mode=2
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+process/size_limit=0
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+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false