Detonate rifle grenades on impact with original Half-Life fireball

2026-10-15 14:20:07 +02:00
parent ae32ad9615
commit 5761e160c1
12 changed files with 581 additions and 81 deletions
@@ -0,0 +1,61 @@
+extends Node3D
+## Original Half-Life fireball, 15 frames at 15 FPS, additive camera-facing quad.
+## A PNG atlas avoids the native GoldSrc importer in Web exports.
+const ATLAS = preload("res://assets/effects/explosion/zerogxplode_atlas.png")
+const FRAME_COUNT := 15
+const FPS := 15.0
+const DURATION := FRAME_COUNT / FPS
+const SIZE := 3.2
+var elapsed := 0.0
+var frame_index := 0
+var fireball: MeshInstance3D
+var material: StandardMaterial3D
+
+func _ready() -> void:
+	name = "GrenadeExplosion"
+	material = StandardMaterial3D.new()
+	material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+	material.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	material.blend_mode = BaseMaterial3D.BLEND_MODE_ADD
+	material.billboard_mode = BaseMaterial3D.BILLBOARD_ENABLED
+	material.cull_mode = BaseMaterial3D.CULL_DISABLED
+	material.albedo_texture = ATLAS
+	material.texture_filter = BaseMaterial3D.TEXTURE_FILTER_LINEAR
+	material.texture_repeat = false
+	# Two-pixel black gutters prevent adjacent frames bleeding under filtering.
+	material.uv1_scale = Vector3(64.0 / 340.0, 64.0 / 204.0, 1)
+	fireball = MeshInstance3D.new()
+	fireball.name = "Fireball"
+	fireball.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
+	var quad := QuadMesh.new()
+	quad.size = Vector2(SIZE, SIZE)
+	quad.material = material
+	fireball.mesh = quad
+	# Raise the fireball, but leave the damage origin at the physical impact.
+	fireball.position.y = 0.8
+	add_child(fireball)
+	_set_frame(0)
+	var light := OmniLight3D.new()
+	light.name = "Flash"
+	light.light_color = Color(1, 0.45, 0.08)
+	light.light_energy = 8
+	light.omni_range = 10
+	light.shadow_enabled = false
+	add_child(light)
+	create_tween().tween_property(light, "light_energy", 0.0, 0.3)
+	# Keep the node alive for the original explosion sound to finish.
+	get_tree().create_timer(4).timeout.connect(queue_free)
+
+func _process(delta: float) -> void:
+	elapsed += delta
+	if elapsed >= DURATION:
+		fireball.hide()
+		set_process(false)
+		return
+	_set_frame(mini(int(elapsed * FPS), FRAME_COUNT - 1))
+
+func _set_frame(index: int) -> void:
+	frame_index = index
+	material.uv1_offset = Vector3(
+		(float(index % 5) * 68 + 2) / 340.0,
+		(float(index / 5) * 68 + 2) / 204.0, 0)