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Unity 3d c# make object behave like water when a new object enters water it disables gravity


Sunlight is shining over the calm surface of a deep blue lake. You stand at the edge of the water, gazing at the tranquility of the scene, when suddenly, a small pebble is tossed into the lake. As the pebble breaks the surface, it creates ripples that spread out across the water, shimmering in the sunlight. You want to create a similar effect in your Unity 3D game, where objects behave like they are in water when they enter it. In this tutorial, we will use C# scripting to achieve this effect. Step 1: Creating the water To begin, we need to create the water in our scene. We can do this by adding a plane or a cube and scaling it to the desired size and shape. We will also add a water material to the object, which can be found under Assets > Standard Assets > Water4 > Prefabs > Water4Advanced. Step 2: Adding a trigger collider Next, we need to add a trigger collider to our water object. This allows us to detect when another object enters the water. To do this, select the water object and click on Add Component. In the search bar, type "Box Collider" and add it to your object. Once the collider is added, make sure to check the "Is Trigger" box in the inspector. Step 3: Creating the script Now we need to create a C# script that will control the behavior of our objects in the water. Create a new C# script called "WaterBehavior" and attach it to your water object. Open the script and add the following code: ``` using System.Collections; using System.Collections.Generic; using UnityEngine; public class WaterBehavior : MonoBehaviour { void OnTriggerEnter(Collider other) { //check if the object is affected by gravity (has a rigidbody) if (other.GetComponent<Rigidbody>()) { //disable gravity other.GetComponent<Rigidbody>().useGravity = false; //add buoyancy force other.GetComponent<Rigidbody>().AddForce(Vector3.up * 5f, ForceMode.Impulse); } } void OnTriggerExit(Collider other) { //check if the object is affected by gravity (has a rigidbody) if (other.GetComponent<Rigidbody>()) { //enable gravity again other.GetComponent<Rigidbody>().useGravity = true; } } } ``` This script uses two functions to detect when an object enters and exits the water trigger collider. When an object enters the water, we first check if it has a rigidbody component, which means it is affected by gravity. We then disable gravity and add an upward force to simulate buoyancy. When the object exits the water, we simply re-enable gravity. Step 4: Testing the script Save your script and go back to your Unity scene. Select a game object that has a rigidbody component (such as a cube or a sphere) and drag it onto your water object in the hierarchy, making it a child of the water. Press play to test your game. When the object enters the water, it should disable gravity and float up. When it exits the water, gravity should be enabled again. You can try adjusting the buoyancy force in the script to achieve the desired effect. Step 5: Further customization You can further customize this script to make the object behave more realistically in the water. For example, you can add drag and angular drag to the rigidbody when it enters the water, to simulate the resistance of water. You can also change the buoyancy force based on the size and shape of the object, or create different types of water with different behaviors. Congratulations, you have now created a simple water behavior script in Unity 3D using C# scripting. You can use this script in your game to make objects behave like they are in water when they enter it. Have fun experimenting with different ways to customize the script and create your own unique water effects!