Unity3D - руководство по скриптописанию

Rigidbody.SetDensity

Sets the mass based on the attached colliders assuming a constant density.

This is useful to set the mass to a value which scales with the size of the colliders.

JavaScripts

rigidbody.SetDensity(1.5);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
rigidbody.SetDensity(1.5F);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
rigidbody.SetDensity(1.5F)