I thought there would be all kinds of examples of how to move an object around in the scene using Touch, but I couldn’t find anything that was simple and straightforward for someone just starting out with Java (like me!).
After digging around in a bunch of different scripts and reading t*** a ton a posts on the Unity F***m, I found this post by col000r which had a nice, simple example. I simplified it a little bit so it would work with just 1 attached object.
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That script gets a good bit of the job done, but the object will jump to the position of you finger no matter where you touch the screen. I wanted the object to only move if you touch it directly. So I added in the raycast code from my previous Unity iPhone Touch Animation Tutorial (which I found in the iPhone-Match example project).
function Update () {
var hit : RaycastHit;
var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
if (Physics.Raycast (ray, hit, 100)) {
//do something here
}
}
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TouchMove Mini-Tutorial:
You can download the project before you get started to see the completed tutorial or you can follow along with the steps below. This one is pretty simple, so following the steps won’t take long.
1. Create a cube: Go to Game Object –> Create Other –> Cube
2. Add a Box Collider to the Cube: Go to Add Component –> Physics –> Box Collider (if your cube doesn’t already have one)
3. Create a new script: Go to Assets –> Create –> Javascript. This will create a new script in your Project panel named NewBehaviourScript. Double-click the script in your Project panel to open it in Unitron.
Copy the following code, paste it into the file, save, and then switch back in Unity. Drag-and-drop the script from the Project view onto the cube in either the Hierarchy or Scene panel.
function Update () {
var hit : RaycastHit;
var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
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4. Be sure to set your iPhone Bundle Identifier: Go to Edit –> Project Settings –> Player and then give it a domain and name. See Step 16 in the Unity iPhone Touch Animation Tutorail if you need help with this step.
5. Build and Run: That should do it.
Note that if you have multiple objects with Colliders on them, your cube will move when you click on any of them (bug!).
Feel free to post in the comments improvements to the above script and/or if you have suggestions for how to handle any of the following…
Planned improvements:
– Object should only move if you touch it, not other Mesh Colliders.
– Object should collide with other objects while being moved
– Object should continue to move after you lift your finger, slow over time — like a hockey puck.
