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Need Help with tween on Texture UV movement.

  • Nice✔️💜💜💜💜

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  • This lens is looking great, i hope you will find a way to solve this problem!

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  • Hi Brendan! 

    Lens is looking cool! If you are ok with a linear interpolation, you likely don't even need Tween Manager:


    var original = new vec2(0, .2);
    var target = new vec2(0, .6);
    var nextValue = vec2.lerp(original, target, percentMoved);
    script.straw_red_anim.mainPass.uv2Offset = nextValue

    where percentMoved is a number between 0, to 1 depending where you want it between .2 and .6

    Can't wait to see final Lens. 


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  • Hi Brendon,

    You can also use the "Set Material Parameter" option in Tween Value script to tween the uv offset property directly. Here's an example setup for it:

    You can use something like this, just make sure to disable "Play automatically" and trigger it from your script (or behavior script) when you want to scroll the uvs.

    Let me know if you need more help!


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  • Thanks Jonathan and Jacob, but I need a bit more guidance. I tried putting Jonathan's data in there. The problem is I don't know how to move percentMoved. When I set percentMoved = .6 during the KissStartEvent it does not seem to do anything. 


    Then I tried Jacob's method. This looks a bit more promising as I now can see the fluid animating on a ping pong loop when I have Play Automatically checked. When I turn that off, how would I trigger that to go up (from .2 to .6) on KissStartedEvent and then back down (from .6 to .2) on KissFinishedEvent?

    You'll need to open this image in a new tab to view it most likely.


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  • Hi Brendan,

    You can use a script like this to kick off the tween. Notice that the call to play tween has the callback (last parameter) to call itself again to start it over.



    // @input SceneObject objectWithTween
    // @input string tweenName

    function playTween() {
    // play tween again after it finishes playing
    global.tweenManager.startTween( script.objectWithTween, script.tweenName, playTween )

    // on tap event, start playing tween
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  • I finally got it to work. I watched this tutorial a few times.

    What most likely hung me up was simply calling/naming the objects correctly and I abandoned my initial scripting setup in the original post.

    To help others reading this, I created two scripts on my straw object, a tween to make the texture on it move one way, and another to move it back. I named them pingpong_start and pingpong_end. Then I set the values (0, .2 and 0, .6). I may have made the error earlier in not capitalized the O in uv2Offset.

    I'm not sure why, but when I tried to create a second TweenValue script in this object it wouldn't let me. It created a bunch of blank lines at the bottom. Instead, I copied the TweenValue script in the gear icon in the upper right, and then pasted and it created a second TweenValue script.

    Then I created a new scene object with two Behavior scripts, one to start the animation up, the other to trigger it back down. Again, I copied and pasted the Behavior script. I'm guessing there is an easier way to do this, but it worked.

    Hopefully this can help someone else with their lens. 

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  • Amazing, thanks for the follow up Brendan!

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