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This post has been wikified, any user with enough reputation can edit it.
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Question by MC HALO · Feb 28, 2011 at 06:50 AM · spritesprites

Explain this script :) plz

var uvAnimationTileX = 24; //Here you can place the number of columns of your sheet.

                    //The above sheet has 24



var uvAnimationTileY = 1; //Here you can place the number of rows of your sheet.

                   //The above sheet has 1

var framesPerSecond = 10.0;

function Update () {

// Calculate index

var index : int = Time.time * framesPerSecond;

// repeat when exhausting all frames

index = index % (uvAnimationTileX * uvAnimationTileY);

    // Size of every tile

       var size = Vector2 (1.0 / uvAnimationTileX, 1.0 / uvAnimationTileY);



    // split into horizontal and vertical index

   var uIndex = index % uvAnimationTileX;

   var vIndex = index / uvAnimationTileX;



    // build offset

    // v coordinate is the bottom of the image in opengl so we need to invert.

    var offset = Vector2 (uIndex * size.x, 2.0 - size.y - vIndex * size.y);



    renderer.material.SetTextureOffset ("_MainTex", offset);

     renderer.material.SetTextureScale ("_MainTex", size);



 }

Right can someone explain what few lines in this code mean? what does

renderer.material.SetTextureOffset ("_MainTex", offset); do ? I am new to unity when it comes to programming 2d sprites i found this on Unity Wiki by the way :)

the second is:

renderer.material.SetTextureOffset ("_MainTex", offset);

and also what does "_MainTex" do in this code?

and last:

What is this line of code doing ?????7

var offset = Vector2 (uIndex size.x, 2.0 - size.y - vIndex size.y);

so if someone can explain that to me i would be very great full thanks :)

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Answer by efge · Feb 28, 2011 at 08:12 AM

This script cycles through the lines and columns of a sprite texture to get a flipbook animation effect. It then supplies the new u and v texture coordinates to the renderer.

_MainTex is the name of a texture in a shader, usually the main texture of the material.

Take a look at he reference:
Material.mainTexture
Material.SetTexture

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avatar image MC HALO · Feb 28, 2011 at 12:22 PM 0
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Thank you very very much :)

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