The vertical direction of the force can be modified using upwardsModifier. As the distance between explosionPosition and the force point increases, the actual applied force decreases. The magnitude of the force depends on the distance between explosionPosition and the point where the force was applied. If explosionPosition is inside the rigidbody, or the rigidbody has no active colliders, then the center of mass is used instead of the closest point on the surface. The force acts along the direction from explosionPosition to the surface point on the rigidbody. This function applies a force to the object at the point on the surface of the rigidbody that is closest to explosionPosition. However, if a value of zero is passed for the radius then the full force will be applied regardless of how far the centre is from the rigidbody. The explosion is modelled as a sphere with a certain centre position and radius in world space normally, anything outside the sphere is not affected by the explosion and the force decreases in proportion to distance from the centre.
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