add projectile model and material

assets/models/projectiles/projectile.glb.import

@@ -0,0 +1,43 @@
+[remap]
+
+importer="scene"
+importer_version=1
+type="PackedScene"
+uid="uid://bl3flu6un3op1"
+path="res://.godot/imported/projectile.glb-af3cf412720af56f90ee1f2373fcb033.scn"
+
+[deps]
+
+source_file="res://assets/models/projectiles/projectile.glb"
+dest_files=["res://.godot/imported/projectile.glb-af3cf412720af56f90ee1f2373fcb033.scn"]
+
+[params]
+
+nodes/root_type=""
+nodes/root_name="Model"
+nodes/apply_root_scale=true
+nodes/root_scale=1.0
+nodes/import_as_skeleton_bones=false
+nodes/use_node_type_suffixes=true
+meshes/ensure_tangents=true
+meshes/generate_lods=true
+meshes/create_shadow_meshes=true
+meshes/light_baking=1
+meshes/lightmap_texel_size=0.2
+meshes/force_disable_compression=false
+skins/use_named_skins=true
+animation/import=true
+animation/fps=30
+animation/trimming=false
+animation/remove_immutable_tracks=true
+animation/import_rest_as_RESET=false
+import_script/path=""
+_subresources={
+"materials": {
+"@MATERIAL:0": {
+"use_external/path": "uid://8ehagthiwlw"
+}
+}
+}
+gltf/naming_version=1
+gltf/embedded_image_handling=1

assets/textures/effects/stripes.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://djqrrvlpfyiax"
+path.s3tc="res://.godot/imported/stripes.png-8a038ce05c63176cd1d7081153e209d2.s3tc.ctex"
+path.etc2="res://.godot/imported/stripes.png-8a038ce05c63176cd1d7081153e209d2.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/textures/effects/stripes.png"
+dest_files=["res://.godot/imported/stripes.png-8a038ce05c63176cd1d7081153e209d2.s3tc.ctex", "res://.godot/imported/stripes.png-8a038ce05c63176cd1d7081153e209d2.etc2.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

assets/textures/light_decal.png.import

@@ -0,0 +1,36 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c85b8i5dign4u"
+path.s3tc="res://.godot/imported/light_decal.png-200e46dc4d0c6b58698ba55123a52301.s3tc.ctex"
+path.etc2="res://.godot/imported/light_decal.png-200e46dc4d0c6b58698ba55123a52301.etc2.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc", "etc2_astc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/textures/light_decal.png"
+dest_files=["res://.godot/imported/light_decal.png-200e46dc4d0c6b58698ba55123a52301.s3tc.ctex", "res://.godot/imported/light_decal.png-200e46dc4d0c6b58698ba55123a52301.etc2.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

resources/materials/projectiles/projectile_glow_mat.tres

@@ -0,0 +1,13 @@
+[gd_resource type="StandardMaterial3D" load_steps=2 format=3 uid="uid://d3f5sarakjtlg"]
+
+[ext_resource type="Texture2D" uid="uid://c85b8i5dign4u" path="res://assets/textures/light_decal.png" id="1_3d8vv"]
+
+[resource]
+transparency = 1
+blend_mode = 1
+albedo_color = Color(0.964706, 0.788235, 0.215686, 0.164706)
+albedo_texture = ExtResource("1_3d8vv")
+billboard_mode = 1
+billboard_keep_scale = true
+proximity_fade_enabled = true
+proximity_fade_distance = 0.1

resources/materials/projectiles/projectile_mat.tres

@@ -0,0 +1,17 @@
+[gd_resource type="ShaderMaterial" load_steps=3 format=3 uid="uid://dnyl326cg2rvh"]
+
+[ext_resource type="Shader" uid="uid://cqndfxuhkpcxq" path="res://shaders/projectile.gdshader" id="1_lb22p"]
+[ext_resource type="Texture2D" uid="uid://djqrrvlpfyiax" path="res://assets/textures/effects/stripes.png" id="2_k4n51"]
+
+[resource]
+render_priority = 0
+shader = ExtResource("1_lb22p")
+shader_parameter/inside_color = Color(1, 1, 1, 1)
+shader_parameter/middle_color = Color(0.964706, 0.788235, 0.215686, 1)
+shader_parameter/rim_texture = ExtResource("2_k4n51")
+shader_parameter/tiling = Vector2(1, 1)
+shader_parameter/offset = Vector2(0, 0)
+shader_parameter/offset_speed = Vector2(0.1, 0.1)
+shader_parameter/speed = 1.0
+shader_parameter/scale = 1.0
+shader_parameter/distortion = 5.0

scenes/projectiles/projectile.tscn

@@ -1,29 +1,42 @@
-[gd_scene load_steps=6 format=3 uid="uid://cejn8wfgw14xs"]
+[gd_scene load_steps=9 format=3 uid="uid://cejn8wfgw14xs"]
 
 [ext_resource type="Script" uid="uid://bbd22tc1scoom" path="res://scripts/projectiles/projectile.gd" id="1_kv6x5"]
 [ext_resource type="Material" uid="uid://cux40v5s5sok3" path="res://resources/materials/debug/debug_projectile.tres" id="2_b024o"]
 [ext_resource type="PackedScene" uid="uid://c8gqrealje3o" path="res://scenes/effects/shadow_decal.tscn" id="3_2dqcj"]
+[ext_resource type="PackedScene" uid="uid://bl3flu6un3op1" path="res://assets/models/projectiles/projectile.glb" id="3_oc4rm"]
+[ext_resource type="Material" uid="uid://dnyl326cg2rvh" path="res://resources/materials/projectiles/projectile_mat.tres" id="4_u2n0m"]
+[ext_resource type="Material" uid="uid://d3f5sarakjtlg" path="res://resources/materials/projectiles/projectile_glow_mat.tres" id="5_fdcqu"]
+
+[sub_resource type="QuadMesh" id="QuadMesh_u2n0m"]
+size = Vector2(2.5, 2.5)
 
 [sub_resource type="SphereShape3D" id="SphereShape3D_vc8th"]
 radius = 0.25
 
-[sub_resource type="SphereMesh" id="SphereMesh_ctqwx"]
-radius = 0.25
-height = 0.5
-
 [node name="Projectile" type="Area3D"]
 collision_layer = 32
 collision_mask = 49
 script = ExtResource("1_kv6x5")
 _collision_debug_material = ExtResource("2_b024o")
 
+[node name="Model" parent="." instance=ExtResource("3_oc4rm")]
+
+[node name="ProjectileMesh" parent="Model" index="0"]
+transform = Transform3D(0.25, 0, 0, 0, 0.25, 0, 0, 0, 0.25, 0, 0, 0)
+layers = 64
+cast_shadow = 0
+surface_material_override/0 = ExtResource("4_u2n0m")
+
+[node name="ProjectileGlow" type="MeshInstance3D" parent="Model/ProjectileMesh" index="0"]
+transform = Transform3D(4, 0, 0, 0, 4, 0, 0, 0, 4, 0, 0, 0)
+mesh = SubResource("QuadMesh_u2n0m")
+skeleton = NodePath("../..")
+surface_material_override/0 = ExtResource("5_fdcqu")
+
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 shape = SubResource("SphereShape3D_vc8th")
 debug_color = Color(0, 0.6, 0.7, 0.42)
 
-[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
-layers = 64
-cast_shadow = 0
-mesh = SubResource("SphereMesh_ctqwx")
-
 [node name="ShadowDecal" parent="." instance=ExtResource("3_2dqcj")]
+
+[editable path="Model"]

scenes/test.tscn

@@ -1,14 +1,12 @@
-[gd_scene load_steps=23 format=3 uid="uid://c0buetf2h266d"]
+[gd_scene load_steps=24 format=3 uid="uid://c0buetf2h266d"]
 
 [ext_resource type="Material" uid="uid://btpy4dp5lb8il" path="res://resources/materials/test_triplanar.tres" id="1_ixaua"]
 [ext_resource type="PackedScene" uid="uid://b73y71y3efmv" path="res://scenes/player.tscn" id="2_f4ehn"]
 [ext_resource type="PackedScene" uid="uid://bq8pflbvlf8q7" path="res://scenes/main_camera.tscn" id="3_74lek"]
 [ext_resource type="PackedScene" uid="uid://cksoaevb5sloo" path="res://scenes/enemies/projectile_spawner.tscn" id="4_84n74"]
+[ext_resource type="PackedScene" uid="uid://cejn8wfgw14xs" path="res://scenes/projectiles/projectile.tscn" id="5_j5jx5"]
 
 [sub_resource type="Environment" id="Environment_wctar"]
-tonemap_mode = 4
-tonemap_exposure = 1.5
-tonemap_white = 5.74
 
 [sub_resource type="Animation" id="Animation_at5dv"]
 resource_name = "!ass"
@@ -127,3 +125,7 @@ libraries = {
 &"": SubResource("AnimationLibrary_lpvoh"),
 &"maa": SubResource("AnimationLibrary_daiq8")
 }
+
+[node name="Projectile" parent="." instance=ExtResource("5_j5jx5")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 11.2686, 1.08522, -3.37655)
+script = null

scripts/projectiles/projectile.gd

@@ -2,23 +2,34 @@ class_name Projectile
 extends Area3D
 
 const HEIGHT: float = 1
+const MAX_STRETCH: float = 0.75
+
+@export var _speed_stretch_factor: float = 100
 
 @export var _collision_debug_material: Material
 
 var _start_position: Vector3
 var _velocity: Vector3
 var _lifetime: float
+var _size: float = 0.25
 
 var _life_timer: float
 
 var _debug_collision_shapes := DebugCollisionShapes.new()
 
+@onready var _model_base: Node3D = $Model
+@onready var _model_mesh: MeshInstance3D = $Model/ProjectileMesh
+
 
 func _ready() -> void:
 	_life_timer = _lifetime
 	_debug_collision_shapes.init(get_children(), self, _collision_debug_material)
 	global_position = _start_position
 	body_entered.connect(_on_body_entered)
+	_model_mesh.rotation = Vector3(
+		randf_range(0, TAU), randf_range(0, TAU), randf_range(0, TAU)
+	)
+	_model_mesh.scale = Vector3.ONE * _size
 
 
 func _physics_process(delta: float) -> void:
@@ -27,6 +38,14 @@ func _physics_process(delta: float) -> void:
 
 	_life_timer -= delta
 	global_position += _velocity * delta
+	look_at(global_position + _velocity, Vector3.UP, true)
+
+	var speed_squash := clampf(
+		_velocity.length() / _speed_stretch_factor, 0, MAX_STRETCH
+	)
+	_model_base.scale = Vector3(
+		1 - speed_squash, 1 - speed_squash, 1 + speed_squash
+	)
 
 
 func init(velocity: Vector3, start_position: Vector3, lifetime: float = 10) -> void:

shaders/projectile.gdshader

@@ -0,0 +1,72 @@
+// using noise displacement code from
+// https://godotshaders.com/shader/3d-bubble-spatial-shield-shader/ and local
+// screen space UV from https://godotshaders.com/shader/local-screen-space-uv/
+
+shader_type spatial;
+render_mode cull_back, unshaded;
+
+group_uniforms Colors;
+
+uniform vec4 inside_color : source_color;
+uniform vec4 middle_color : source_color;
+uniform sampler2D rim_texture : source_color;
+uniform vec2 tiling = vec2(1.0);
+uniform vec2 offset = vec2(0.0);
+uniform vec2 offset_speed = vec2(0.1);
+
+group_uniforms VertexDisplacement;
+
+uniform float speed = 1.0;
+uniform float scale = 1.0;
+uniform float distortion = 5.0;
+
+varying vec4 NODE_POSITION_CLIP;
+
+float noise(vec3 p) {
+  return fract(sin(dot(p, vec3(12.9898, 78.233, 45.5432))) * 43758.5453);
+}
+
+float fbm(vec3 p) {
+  float value = 0.0;
+  float amplitude = 0.5;
+  float frequency = 1.0;
+  for (int i = 0; i < 5; i++) {
+    value += amplitude * noise(p * frequency);
+    amplitude *= 0.5;
+    frequency *= 2.0;
+  }
+  return value;
+}
+
+void vertex() {
+  float displacement =
+      (fbm(VERTEX * scale + vec3(0.0, 0.0, TIME * speed * 0.000001)) - 0.5) *
+      distortion;
+  VERTEX += NORMAL * displacement * 0.1;
+
+  NODE_POSITION_CLIP = (PROJECTION_MATRIX * vec4(NODE_POSITION_VIEW, 1.0));
+}
+
+void fragment() {
+  if (COLOR.r >= 0.5) {
+    ALBEDO = inside_color.rgb;
+  } else if (COLOR.g >= 0.5) {
+    ALBEDO = middle_color.rgb;
+  } else if (COLOR.b >= 0.5) {
+    vec2 local_uv =
+        (SCREEN_UV * 2.0 - 1.0) * NODE_POSITION_CLIP.w - NODE_POSITION_CLIP.xy;
+
+    local_uv.x *= VIEWPORT_SIZE.x / VIEWPORT_SIZE.y;
+    local_uv *= -1.0 / PROJECTION_MATRIX[1][1];
+
+    vec3 color = texture(rim_texture,
+                         local_uv * tiling + 0.5 + offset + TIME * offset_speed)
+                     .rgb;
+
+    if (color.r < 0.5) {
+      discard;
+    }
+
+    ALBEDO = middle_color.rgb;
+  }
+}

shaders/projectile.gdshader.uid

@@ -0,0 +1 @@
+uid://cqndfxuhkpcxq