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extends Decal
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class_name ParticleDecal
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@export var lifetime: float = 1
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@export var gradient: Gradient
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@export var scale_curve: Curve
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@export var particle_rotate: int
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var lifetime_now: float
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func on_process(delta: float) -> void:
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lifetime_now += delta
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var rate: float = lifetime_now / lifetime
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if rate > 1:
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return
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#色带
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if gradient:
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modulate = gradient.sample(rate)
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else:
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modulate.a = 1 - rate
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#缩放曲线
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if scale_curve:
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var scale_sample: float = scale_curve.sample(rate)
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scale = Vector3(scale_sample, 1, scale_sample)
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#旋转
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rotation_degrees.y = particle_rotate * rate
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return
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