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Add 3D physics interpolation demo
Demonstrate first person shooter and third person shooter cameras.
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‎3d/physics_interpolation/README.md‎

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# Physics Interpolation
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This demo showcases [physics interpolation](https://docs.godotengine.org/en/stable/tutorials/physics/interpolation/index.html)
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in 3D with varying camera modes (first person, third person, fixed perspective).
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This is also known as *fixed timestep interpolation*.
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Physics interpolation makes motion appear smooth regardless of the rendered
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framerate and physics ticks per second configured in the Project Settings.
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There are some caveats related to its usage though, such as increased latency
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and potential issues with teleporting objects. It's recommended to go
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through the
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[documentation](https://docs.godotengine.org/en/stable/tutorials/physics/interpolation/physics_interpolation_introduction.html)
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when enabling physics interpolation in a project.
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Physics interpolation is enabled by default in this project. Press <kbd>T</kbd>
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to toggle it while the demo is running. This allows you to see the impact on
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smoothness of physics interpolation.
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Controls:
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- <kbd>W/A/S/D</kbd>, <kbd>Arrow Keys</kbd>, <kbd>Gamepad Left Stick</kbd>, <kbd>Gamepad D-Pad</kbd>: Move
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- <kbd>Space</kbd>, <kbd>Right Mouse Button</kbd>, <kbd>Gamepad A/Cross</kbd>: Jump
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- <kbd>Left mouse button</kbd>, <kbd>Gamepad Right Trigger</kbd>: Fire
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- <kbd>Tab</kbd>, <kbd>Gamepad Select</kbd>: Change camera (first-person, third-person, fixed)
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- <kbd>R</kbd>, <kbd>Gamepad Y/Triangle</kbd>: Reset position
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- <kbd>T</kbd>, <kbd>Gamepad Left Shoulder</kbd>: Toggle physics interpolation
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Language: GDScript
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Renderer: Compatibility
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## Screenshots
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![Screenshot](screenshots/physics_interpolation.webp)

‎3d/physics_interpolation/box.tscn‎

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

‎3d/physics_interpolation/bullet.gd‎

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extends RigidBody3D
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@export var scale_curve: Curve
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var _enabled := false
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func _ready() -> void:
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$CollisionShape3D.disabled = true
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func _physics_process(_delta: float) -> void:
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# Start with physics collision disabled until the first tick.
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# This prevents bullets from colliding with the player when first shot, while still
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# allowing them to be moved by the player when they're laying on the ground.
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if not _enabled:
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$CollisionShape3D.disabled = false
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_enabled = true
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# Apply the appearance scaling according to the scale curve.
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var time_left_ratio: float = 1.0 - $Timer.time_left / $Timer.wait_time
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var scale_sampled := scale_curve.sample_baked(time_left_ratio)
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$Scaler.scale = Vector3.ONE * scale_sampled
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func _on_timer_timeout() -> void:
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queue_free()

‎3d/physics_interpolation/bullet.gd.uid‎

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uid://dohdjr8ilotkr

‎3d/physics_interpolation/bullet.tscn‎

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[ext_resource type="Script" uid="uid://dohdjr8ilotkr" path="res://bullet.gd" id="1_v7oki"]
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[ext_resource type="Texture2D" uid="uid://b70s43gn8c3kx" path="res://spark_particle.png" id="2_v8qja"]
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[sub_resource type="PhysicsMaterial" id="PhysicsMaterial_v8qja"]
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bounce = 0.61
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[sub_resource type="Curve" id="Curve_t4vbm"]
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_data = [Vector2(0, 0), 0.0, 0.0, 0, 0, Vector2(0.02, 1), 0.0, 0.0, 0, 0, Vector2(1, 0), 0.0, 0.0, 0, 0]
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point_count = 3
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[sub_resource type="SphereShape3D" id="SphereShape3D_rtl8c"]
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radius = 0.2
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[sub_resource type="Gradient" id="Gradient_v8qja"]
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colors = PackedColorArray(1, 1, 1, 1, 1, 1, 1, 0)
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[sub_resource type="GradientTexture1D" id="GradientTexture1D_t4vbm"]
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gradient = SubResource("Gradient_v8qja")
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[sub_resource type="Curve" id="Curve_v8qja"]
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_data = [Vector2(0, 1), 0.0, 0.0, 0, 0, Vector2(1, 0), 0.0, 0.0, 0, 0]
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point_count = 2
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[sub_resource type="CurveTexture" id="CurveTexture_t4vbm"]
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curve = SubResource("Curve_v8qja")
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[sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_v7oki"]
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direction = Vector3(0, 1, 0)
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initial_velocity_max = 1.0
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gravity = Vector3(0, 1, 0)
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scale_min = 0.2
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scale_curve = SubResource("CurveTexture_t4vbm")
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color_ramp = SubResource("GradientTexture1D_t4vbm")
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[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_t4vbm"]
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transparency = 1
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blend_mode = 1
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shading_mode = 0
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vertex_color_use_as_albedo = true
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albedo_color = Color(2.33575, 3.29442, 3.29442, 1)
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albedo_texture = ExtResource("2_v8qja")
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texture_filter = 5
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[sub_resource type="QuadMesh" id="QuadMesh_rtl8c"]
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material = SubResource("StandardMaterial3D_t4vbm")
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size = Vector2(0.2, 0.2)
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[sub_resource type="SphereMesh" id="SphereMesh_v7oki"]
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radial_segments = 24
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rings = 12
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[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_v7oki"]
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albedo_color = Color(0.431649, 0.57319, 0.501392, 1)
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metallic = 1.0
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[node name="Bullet" type="RigidBody3D"]
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collision_layer = 2
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physics_material_override = SubResource("PhysicsMaterial_v8qja")
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script = ExtResource("1_v7oki")
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scale_curve = SubResource("Curve_t4vbm")
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[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
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shape = SubResource("SphereShape3D_rtl8c")
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[node name="GPUParticles3D" type="GPUParticles3D" parent="."]
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amount = 64
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transform_align = 1
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process_material = SubResource("ParticleProcessMaterial_v7oki")
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draw_pass_1 = SubResource("QuadMesh_rtl8c")
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[node name="Scaler" type="Node3D" parent="."]
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transform = Transform3D(0.001, 0, 0, 0, 0.001, 0, 0, 0, 0.001, 0, 0, 0)
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[node name="MeshInstance3D" type="MeshInstance3D" parent="Scaler"]
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transform = Transform3D(0.4, 0, 0, 0, 0.4, 0, 0, 0, 0.4, 0, 0, 0)
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mesh = SubResource("SphereMesh_v7oki")
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skeleton = NodePath("../..")
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surface_material_override/0 = SubResource("StandardMaterial3D_v7oki")
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[node name="Timer" type="Timer" parent="."]
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wait_time = 5.0
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autostart = true
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[connection signal="timeout" from="Timer" to="." method="_on_timer_timeout"]

‎3d/physics_interpolation/icon.png.import‎

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‎3d/physics_interpolation/icon.svg‎

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‎3d/physics_interpolation/icon.svg.import‎

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