Add a 3D particles demo (#757)

3d/particles/README.md

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+# 3D Particles
+
+This project showcases various 3D particle features supported by Godot, for both GPU-based and CPU-based particles.
+This includes particle collision, attractors, trails and subemitters.
+
+Language: GDScript
+
+Renderer: Vulkan Clustered
+
+## Screenshots
+
+![Screenshot](screenshots/3d_particles.png)

3d/particles/checker.LICENSE.md

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+# License for `checker.png`
+
+Copyright (c) 2020 Kenney
+
+Licensed under CC0 1.0 Universal.
+
+Downloaded from https://kenney.nl/assets/prototype-textures

3d/particles/checker.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://chjqieyps5n5r"
+path.s3tc="res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.s3tc.ctex"
+path.etc2="res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc", "etc2"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://checker.png"
+dest_files=["res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.s3tc.ctex", "res://.godot/imported/checker.png-6bb199bedbd039461e4248c1d0b9691d.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

3d/particles/default_env.tres

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+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="Sky" id=1]
+
+[resource]
+background_mode = 2
+sky = SubResource( 1 )

3d/particles/icon.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ejq6pclcuglh"
+path="res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=["res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.ctex"]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+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=1

3d/particles/kenney/smoke_05.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ddp8ek6rswwmc"
+path.s3tc="res://.godot/imported/smoke_05.png-7e246e30a4b7ed8644556ad9ae88f0d2.s3tc.ctex"
+path.etc2="res://.godot/imported/smoke_05.png-7e246e30a4b7ed8644556ad9ae88f0d2.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc", "etc2"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://kenney/smoke_05.png"
+dest_files=["res://.godot/imported/smoke_05.png-7e246e30a4b7ed8644556ad9ae88f0d2.s3tc.ctex", "res://.godot/imported/smoke_05.png-7e246e30a4b7ed8644556ad9ae88f0d2.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

3d/particles/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+_global_script_classes=[]
+_global_script_class_icons={}
+
+[application]
+
+config/name="3D Particles"
+config/description="This project showcases various 3D particle features supported by Godot, for both GPU-based and CPU-based particles."
+run/main_scene="res://test.tscn"
+config/features=PackedStringArray("4.0")
+config/icon="res://icon.png"
+
+[display]
+
+window/stretch/mode="canvas_items"
+window/stretch/aspect="expand"
+
+[rendering]
+
+textures/default_filters/anisotropic_filtering_level=4
+quality/screen_filters/msaa=3
+environment/default_environment="res://default_env.tres"

3d/particles/test.GPUParticlesCollisionSDF3D_data.exr.import

@@ -0,0 +1,26 @@
+[remap]
+
+importer="3d_texture"
+type="CompressedTexture3D"
+uid="uid://dgnb433rl8hr1"
+path="res://.godot/imported/test.GPUParticlesCollisionSDF3D_data.exr-29a2410593f1eebabf1e1d8c3f3a6320.ctex3d"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://test.GPUParticlesCollisionSDF3D_data.exr"
+dest_files=["res://.godot/imported/test.GPUParticlesCollisionSDF3D_data.exr-29a2410593f1eebabf1e1d8c3f3a6320.ctex3d"]
+
+[params]
+
+compress/mode=3
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/bptc_ldr=0
+compress/channel_pack=1
+mipmaps/generate=false
+mipmaps/limit=-1
+slices/horizontal=1
+slices/vertical=64

3d/particles/test.tscn

@@ -0,0 +1,969 @@
+[gd_scene load_steps=77 format=3 uid="uid://bo5sv4e5gv8rc"]
+
+[ext_resource type="Texture2D" uid="uid://ddp8ek6rswwmc" path="res://kenney/smoke_05.png" id="3_pmhp8"]
+[ext_resource type="CompressedTexture3D" uid="uid://dgnb433rl8hr1" path="res://test.GPUParticlesCollisionSDF3D_data.exr" id="4_wcrow"]
+[ext_resource type="Texture2D" uid="uid://chjqieyps5n5r" path="res://checker.png" id="14"]
+[ext_resource type="Script" path="res://tester.gd" id="18"]
+
+[sub_resource type="ProceduralSkyMaterial" id="9"]
+
+[sub_resource type="Sky" id="10"]
+sky_material = SubResource("9")
+
+[sub_resource type="Environment" id="11"]
+background_mode = 2
+sky = SubResource("10")
+
+[sub_resource type="Animation" id="Animation_qdnt6"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Testers/GPUParticlesCollisionGlobalCoords/GPUParticles3D:position")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(0, 1.2, 0)]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Testers/GPUParticlesCollision/MovingBox:position")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(0, -0.45, -0.5)]
+}
+tracks/2/type = "value"
+tracks/2/imported = false
+tracks/2/enabled = true
+tracks/2/path = NodePath("Testers/GPUParticlesCollisionGlobalCoords/MovingBox:position")
+tracks/2/interp = 1
+tracks/2/loop_wrap = true
+tracks/2/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(0, -0.45, -0.5)]
+}
+tracks/3/type = "value"
+tracks/3/imported = false
+tracks/3/enabled = true
+tracks/3/path = NodePath("Testers/CPUParticlesForceField/CPUParticles3D:position")
+tracks/3/interp = 1
+tracks/3/loop_wrap = true
+tracks/3/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(0, 1, 0)]
+}
+tracks/4/type = "value"
+tracks/4/imported = false
+tracks/4/enabled = true
+tracks/4/path = NodePath("Testers/CPUParticlesForceField/CPUParticles3D:rotation")
+tracks/4/interp = 1
+tracks/4/loop_wrap = true
+tracks/4/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector3(0, 0, 0)]
+}
+
+[sub_resource type="Animation" id="12"]
+resource_name = "move"
+length = 4.0
+loop_mode = 1
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Testers/GPUParticlesCollisionGlobalCoords/GPUParticles3D:position")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 2),
+"transitions": PackedFloat32Array(-2, -2),
+"update": 0,
+"values": [Vector3(0, 1.2, 0), Vector3(0, 4.2, 0)]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("Testers/GPUParticlesCollision/MovingBox:position")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0, 2),
+"transitions": PackedFloat32Array(-2, -2),
+"update": 0,
+"values": [Vector3(0, -0.45, -0.5), Vector3(0, 0.65, -0.5)]
+}
+tracks/2/type = "value"
+tracks/2/imported = false
+tracks/2/enabled = true
+tracks/2/path = NodePath("Testers/GPUParticlesCollisionGlobalCoords/MovingBox:position")
+tracks/2/interp = 1
+tracks/2/loop_wrap = true
+tracks/2/keys = {
+"times": PackedFloat32Array(0, 2),
+"transitions": PackedFloat32Array(-2, -2),
+"update": 0,
+"values": [Vector3(0, -0.45, -0.5), Vector3(0, 0.65, -0.5)]
+}
+tracks/3/type = "value"
+tracks/3/imported = false
+tracks/3/enabled = true
+tracks/3/path = NodePath("Testers/CPUParticlesForceField/CPUParticles3D:position")
+tracks/3/interp = 1
+tracks/3/loop_wrap = true
+tracks/3/keys = {
+"times": PackedFloat32Array(0, 2),
+"transitions": PackedFloat32Array(-2, -2),
+"update": 0,
+"values": [Vector3(0, 1, 0), Vector3(0, 0, 0)]
+}
+tracks/4/type = "value"
+tracks/4/imported = false
+tracks/4/enabled = true
+tracks/4/path = NodePath("Testers/CPUParticlesForceField/CPUParticles3D:rotation")
+tracks/4/interp = 1
+tracks/4/loop_wrap = true
+tracks/4/keys = {
+"times": PackedFloat32Array(0, 2, 4),
+"transitions": PackedFloat32Array(1, 1, 1),
+"update": 0,
+"values": [Vector3(0, 0, 0), Vector3(0, 3.14159, 0), Vector3(0, 6.28319, 0)]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_ecfcr"]
+_data = {
+"RESET": SubResource("Animation_qdnt6"),
+"move": SubResource("12")
+}
+
+[sub_resource type="StandardMaterial3D" id="13"]
+diffuse_mode = 1
+albedo_texture = ExtResource("14")
+uv1_scale = Vector3(32, 32, 1)
+texture_filter = 5
+
+[sub_resource type="PlaneMesh" id="14"]
+material = SubResource("13")
+size = Vector2(128, 128)
+
+[sub_resource type="Gradient" id="Gradient_ywyk1"]
+interpolation_mode = 2
+colors = PackedColorArray(1, 1, 1, 1, 1, 1, 1, 0)
+
+[sub_resource type="GradientTexture2D" id="GradientTexture2D_4rekb"]
+gradient = SubResource("Gradient_ywyk1")
+fill = 1
+fill_from = Vector2(0.5, 0.5)
+fill_to = Vector2(0.5, 0.01)
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_ls6ob"]
+transparency = 1
+shading_mode = 0
+vertex_color_use_as_albedo = true
+albedo_color = Color(1, 2, 3, 0.7)
+albedo_texture = SubResource("GradientTexture2D_4rekb")
+billboard_mode = 3
+particles_anim_h_frames = 1
+particles_anim_v_frames = 1
+particles_anim_loop = false
+proximity_fade_enabled = true
+proximity_fade_distance = 2.0
+
+[sub_resource type="QuadMesh" id="QuadMesh_7ay8c"]
+material = SubResource("StandardMaterial3D_ls6ob")
+size = Vector2(0.1, 0.1)
+
+[sub_resource type="Gradient" id="Gradient_drqcv"]
+interpolation_mode = 2
+offsets = PackedFloat32Array(0, 0.289474, 0.542105, 1)
+colors = PackedColorArray(1, 1, 1, 0, 1, 1, 1, 0.92549, 0.235294, 0.317647, 1, 0.564706, 1, 1, 1, 0)
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_cgumr"]
+transparency = 1
+shading_mode = 0
+vertex_color_use_as_albedo = true
+albedo_texture = ExtResource("3_pmhp8")
+billboard_mode = 3
+particles_anim_h_frames = 1
+particles_anim_v_frames = 1
+particles_anim_loop = false
+proximity_fade_enabled = true
+proximity_fade_distance = 0.5
+
+[sub_resource type="QuadMesh" id="QuadMesh_0jly8"]
+material = SubResource("StandardMaterial3D_cgumr")
+
+[sub_resource type="Gradient" id="Gradient_or8rt"]
+interpolation_mode = 2
+offsets = PackedFloat32Array(0, 0.131579, 0.184211, 0.321053, 0.473684, 0.752632, 1)
+colors = PackedColorArray(0.25098, 0.25098, 0.25098, 1, 1, 0.802991, 0.664426, 1, 1, 0.682353, 0, 1, 1, 0.601, 0.37, 1, 1, 0.25, 0.1, 0.447059, 0, 0, 0, 0.184314, 0.25098, 0.25098, 0.25098, 0)
+
+[sub_resource type="Gradient" id="Gradient_827lf"]
+interpolation_mode = 2
+offsets = PackedFloat32Array(0.01875, 0.0722892, 0.433735, 0.716867, 1)
+colors = PackedColorArray(0, 0, 0, 1, 0.686275, 0.188235, 0, 1, 1, 0.517647, 0.0784314, 1, 1, 0.0784314, 0, 0.447059, 0.25098, 0.25098, 0.25098, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_2374g"]
+gradient = SubResource("Gradient_827lf")
+
+[sub_resource type="Curve" id="Curve_3eqrx"]
+_data = [Vector2(0, 1), 0.0, 0.0, 0, 0, Vector2(1, 1), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="CurveTexture" id="CurveTexture_3g7oh"]
+curve = SubResource("Curve_3eqrx")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticlesMaterial_wcmum"]
+emission_shape = 3
+emission_box_extents = Vector3(0.5, 0, 0.5)
+direction = Vector3(0, 1, 0)
+spread = 3.5
+gravity = Vector3(0, 0, 0)
+initial_velocity_min = 1.0
+initial_velocity_max = 4.0
+angular_velocity_max = 360.0
+damping_min = 2.0
+damping_max = 2.0
+scale_min = 0.1
+scale_max = 0.8
+scale_curve = SubResource("CurveTexture_3g7oh")
+color = Color(4, 4, 4, 1)
+color_ramp = SubResource("GradientTexture1D_2374g")
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_dod7h"]
+transparency = 1
+shading_mode = 0
+vertex_color_use_as_albedo = true
+albedo_texture = ExtResource("3_pmhp8")
+billboard_mode = 3
+particles_anim_h_frames = 1
+particles_anim_v_frames = 1
+particles_anim_loop = false
+proximity_fade_enabled = true
+proximity_fade_distance = 0.3
+
+[sub_resource type="QuadMesh" id="QuadMesh_783ir"]
+material = SubResource("StandardMaterial3D_dod7h")
+
+[sub_resource type="Gradient" id="Gradient_lgkn4"]
+offsets = PackedFloat32Array(0, 0.542169, 1)
+colors = PackedColorArray(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_l2iq7"]
+gradient = SubResource("Gradient_lgkn4")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticlesMaterial_a3ot6"]
+direction = Vector3(0, 1, 0)
+gravity = Vector3(0, -2, 0)
+initial_velocity_min = 1.0
+initial_velocity_max = 2.0
+angular_velocity_max = 180.0
+tangential_accel_min = 3.0
+tangential_accel_max = 3.0
+color = Color(0.55, 0.55, 0.55, 1)
+color_ramp = SubResource("GradientTexture1D_l2iq7")
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_jtphw"]
+transparency = 1
+shading_mode = 0
+vertex_color_use_as_albedo = true
+albedo_texture = ExtResource("3_pmhp8")
+billboard_mode = 3
+particles_anim_h_frames = 1
+particles_anim_v_frames = 1
+particles_anim_loop = false
+proximity_fade_enabled = true
+proximity_fade_distance = 0.3
+
+[sub_resource type="QuadMesh" id="QuadMesh_edvlt"]
+material = SubResource("StandardMaterial3D_jtphw")
+
+[sub_resource type="Gradient" id="Gradient_6585v"]
+interpolation_mode = 2
+offsets = PackedFloat32Array(0, 0.674699, 1)
+colors = PackedColorArray(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_6ubl1"]
+gradient = SubResource("Gradient_6585v")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticlesMaterial_4noo4"]
+direction = Vector3(0, 1, 0)
+gravity = Vector3(0, 0, 0)
+initial_velocity_min = 1.0
+initial_velocity_max = 1.0
+color_ramp = SubResource("GradientTexture1D_6ubl1")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticlesMaterial_ft0gs"]
+emission_shape = 6
+emission_ring_axis = Vector3(0, 1, 0)
+emission_ring_height = 0.0
+emission_ring_radius = 0.25
+emission_ring_inner_radius = 0.25
+radial_accel_min = 2.0
+radial_accel_max = 2.0
+collision_mode = 1
+collision_friction = 0.1
+collision_bounce = 0.0
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_r4xcu"]
+albedo_color = Color(0.521569, 1, 0.776471, 1)
+
+[sub_resource type="BoxMesh" id="BoxMesh_88317"]
+material = SubResource("StandardMaterial3D_r4xcu")
+size = Vector3(0.1, 0.1, 0.1)
+
+[sub_resource type="BoxMesh" id="BoxMesh_3dp4g"]
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_3jlyg"]
+
+[sub_resource type="Gradient" id="Gradient_yv8jc"]
+interpolation_mode = 2
+offsets = PackedFloat32Array(0, 0.0963855, 1)
+colors = PackedColorArray(1, 1, 1, 0, 1, 1, 1, 0.917647, 1, 1, 1, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_bewgf"]
+gradient = SubResource("Gradient_yv8jc")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticlesMaterial_pe2at"]
+emission_shape = 6
+emission_ring_axis = Vector3(0, 1, 0)
+emission_ring_height = 0.0
+emission_ring_radius = 1.6
+emission_ring_inner_radius = 0.0
+gravity = Vector3(0, 1, 0)
+color = Color(1, 1, 1, 0.25098)
+color_ramp = SubResource("GradientTexture1D_bewgf")
+
+[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_8mtil"]
+transparency = 1
+shading_mode = 0
+vertex_color_use_as_albedo = true
+proximity_fade_enabled = true
+proximity_fade_distance = 0.5
+
+[sub_resource type="SphereMesh" id="SphereMesh_rowu5"]
+material = SubResource("StandardMaterial3D_8mtil")
+radius = 0.4
+height = 0.4
+radial_segments = 16
+rings = 16
+
+[sub_resource type="Gradient" id="Gradient_eedjr"]
+interpolation_mode = 1
+offsets = PackedFloat32Array(0.25974, 0.376623, 0.948052)
+colors = PackedColorArray(1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_0pfio"]
+gradient = SubResource("Gradient_eedjr")
+
+[sub_resource type="Gradient" id="Gradient_nwe6x"]
+offsets = PackedFloat32Array(0, 0.168831, 1)
+colors = PackedColorArray(1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_wmonn"]
+gradient = SubResource("Gradient_nwe6x")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticlesMaterial_bwh6l"]
+emission_shape = 3
+emission_box_extents = Vector3(1, 0, 1)
+direction = Vector3(0, 1, 0)
+spread = 15.0
+initial_velocity_min = 6.0
+initial_velocity_max = 6.0
+radial_accel_min = -2.0
+radial_accel_max = -2.0
+tangential_accel_min = 1.0
+tangential_accel_max = 4.0
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+
+[node name="Slope2" type="MeshInstance3D" parent="Testers/GPUParticlesCollisionSDF"]
+transform = Transform3D(-4.2222e-08, 1.13133e-08, 1, 0.5, 0.866026, 1.13133e-08, -0.866025, 0.5, -4.2222e-08, -1, 0.1, -0.400002)
+mesh = SubResource("BoxMesh_frpx7")
+skeleton = NodePath("../../GPUParticlesCollisionHeightfield")
+
+[node name="Floor" type="MeshInstance3D" parent="Testers/GPUParticlesCollisionSDF"]
+mesh = SubResource("BoxMesh_dcd5l")
+skeleton = NodePath("../../GPUParticlesCollisionHeightfield")
+
+[node name="GPUParticlesCollisionHeightfield" type="Node3D" parent="Testers"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, -22)
+
+[node name="GPUParticles3D" type="GPUParticles3D" parent="Testers/GPUParticlesCollisionHeightfield"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1.2, 0)
+amount = 150
+lifetime = 1.5
+fixed_fps = 0
+interpolate = false
+collision_base_size = 0.04
+visibility_aabb = AABB(-1.63511, -1.25001, -1.31512, 3.0892, 2.15487, 2.91765)
+process_material = SubResource("ParticleProcessMaterial_4f0te")
+draw_pass_1 = SubResource("SphereMesh_8xbmh")
+
+[node name="GPUParticlesCollisionHeightField3D" type="GPUParticlesCollisionHeightField3D" parent="Testers/GPUParticlesCollisionHeightfield"]
+extents = Vector3(2, 1, 2)
+
+[node name="CSGBox3D" type="CSGBox3D" parent="Testers/GPUParticlesCollisionHeightfield"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.5, 0)
+size = Vector3(3.5, 1, 3.5)
+
+[node name="CSGBox3D2" type="CSGBox3D" parent="Testers/GPUParticlesCollisionHeightfield/CSGBox3D"]
+transform = Transform3D(1, 0, 0, 0, 0.996064, 0.0886335, 0, -0.0886335, 0.996064, 0, 0.92037, -0.361961)
+operation = 2
+size = Vector3(4, 1, 4)
+
+[node name="CSGBox3D3" type="CSGBox3D" parent="Testers/GPUParticlesCollisionHeightfield/CSGBox3D"]
+transform = Transform3D(0.638543, 0.331028, -0.694755, -0.177732, 0.94179, 0.285381, 0.748782, -0.0587477, 0.660207, 0.886086, 0.849547, 0.346458)
+operation = 2
+size = Vector3(4, 1, 4)
+
+[node name="CSGBox3D4" type="CSGBox3D" parent="Testers/GPUParticlesCollisionHeightfield/CSGBox3D"]
+transform = Transform3D(0.61798, -0.298242, -0.727428, 0.239637, 0.95268, -0.187014, 0.748782, -0.0587477, 0.660207, -0.249068, 0.868665, 0.346458)
+operation = 2
+size = Vector3(4, 1, 4)
+
+[node name="CSGBox3D5" type="CSGBox3D" parent="Testers/GPUParticlesCollisionHeightfield/CSGBox3D"]
+transform = Transform3D(0.453442, 0.771907, -0.44559, -0.483441, 0.633015, 0.604629, 0.748782, -0.0587477, 0.660207, -0.310878, 1.96879, 0.695173)
+operation = 2
+size = Vector3(4, 1, 4)
+
+[node name="TestName" type="Label" parent="."]
+anchors_preset = 7
+anchor_left = 0.5
+anchor_top = 1.0
+anchor_right = 0.5
+anchor_bottom = 1.0
+offset_left = -192.0
+offset_top = -58.0
+offset_right = 192.0
+offset_bottom = -24.0
+grow_horizontal = 2
+grow_vertical = 0
+theme_override_colors/font_outline_color = Color(0, 0, 0, 1)
+theme_override_constants/outline_size = 5
+theme_override_font_sizes/font_size = 24
+horizontal_alignment = 1
+
+[node name="Previous" type="Button" parent="."]
+anchors_preset = 2
+anchor_top = 1.0
+anchor_bottom = 1.0
+offset_left = 24.0
+offset_top = -55.0
+offset_right = 135.0
+offset_bottom = -24.0
+grow_vertical = 0
+text = "«  Previous"
+
+[node name="Next" type="Button" parent="."]
+anchors_preset = 3
+anchor_left = 1.0
+anchor_top = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = -107.0
+offset_top = -55.0
+offset_right = -24.0
+offset_bottom = -24.0
+grow_horizontal = 0
+grow_vertical = 0
+text = "Next  »"
+
+[connection signal="pressed" from="Previous" to="." method="_on_previous_pressed"]
+[connection signal="pressed" from="Next" to="." method="_on_next_pressed"]

3d/particles/tester.gd

@@ -0,0 +1,70 @@
+extends WorldEnvironment
+
+const ROT_SPEED = 0.003
+const ZOOM_SPEED = 0.125
+const MAIN_BUTTONS = MOUSE_BUTTON_MASK_LEFT | MOUSE_BUTTON_MASK_RIGHT | MOUSE_BUTTON_MASK_MIDDLE
+
+var tester_index = 0
+var rot_x = deg_to_rad(-22.5)  # This must be kept in sync with RotationX.
+var rot_y = deg_to_rad(90)  # This must be kept in sync with CameraHolder.
+var zoom = 2.5
+var base_height = ProjectSettings.get_setting("display/window/size/viewport_height")
+
+@onready var testers = $Testers
+@onready var camera_holder = $CameraHolder # Has a position and rotates on Y.
+@onready var rotation_x = $CameraHolder/RotationX
+@onready var camera = $CameraHolder/RotationX/Camera3D
+
+
+func _ready():
+	camera_holder.transform.basis = Basis.from_euler(Vector3(0, rot_y, 0))
+	rotation_x.transform.basis = Basis.from_euler(Vector3(rot_x, 0, 0))
+	update_gui()
+
+
+func _unhandled_input(event):
+	if event.is_action_pressed("ui_left"):
+		_on_previous_pressed()
+	if event.is_action_pressed("ui_right"):
+		_on_next_pressed()
+
+	if event is InputEventMouseButton:
+		if event.button_index == MOUSE_BUTTON_WHEEL_UP:
+			zoom -= ZOOM_SPEED
+		if event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
+			zoom += ZOOM_SPEED
+		zoom = clamp(zoom, 1.5, 4)
+
+	if event is InputEventMouseMotion and event.button_mask & MAIN_BUTTONS:
+		# Compensate motion speed to be resolution-independent (based on the window height).
+		var relative_motion = event.relative * DisplayServer.window_get_size().y / base_height
+		rot_y -= relative_motion.x * ROT_SPEED
+		rot_x -= relative_motion.y * ROT_SPEED
+		rot_x = clamp(rot_x, deg_to_rad(-90), 0)
+		camera_holder.transform.basis = Basis.from_euler(Vector3(0, rot_y, 0))
+		rotation_x.transform.basis = Basis.from_euler(Vector3(rot_x, 0, 0))
+
+
+func _process(delta):
+	var current_tester = testers.get_child(tester_index)
+	# This code assumes CameraHolder's X and Y coordinates are already correct.
+	var current_position = camera_holder.global_transform.origin.z
+	var target_position = current_tester.global_transform.origin.z
+	camera_holder.global_transform.origin.z = lerpf(current_position, target_position, 3 * delta)
+	camera.position.z = lerpf(camera.position.z, zoom, 10 * delta)
+
+
+func _on_previous_pressed():
+	tester_index = max(0, tester_index - 1)
+	update_gui()
+
+
+func _on_next_pressed():
+	tester_index = min(tester_index + 1, testers.get_child_count() - 1)
+	update_gui()
+
+
+func update_gui():
+	$TestName.text = str(testers.get_child(tester_index).name).capitalize()
+	$Previous.disabled = tester_index == 0
+	$Next.disabled = tester_index == testers.get_child_count() - 1