使用重力时，请将此值设置在 0 到 1 之间，以控制重力效果的聚焦点。
将值设置为 0 会导致粒子被吸引到体积的中心，而将值设置为 1 将导致粒子被吸引到形状的外边缘。将值设置为 0 到 1 之间将在体积的内部和外部范围之间移动聚焦点。 另请参阅：ParticleSystemForceField。
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