Hi, I've been trying and experimenting on GetPixel/SetPixels to read color data of a 64 x 64 pixels psd file and paste the retrieved data into a Texture2D. The stencil (PSD file) comes with a single layer without background. The Texture2d that is created inside the code is formatted as ARGB32 and the PSD is also imported as ARGB32. In the test link you can see that each star overlaps and removes the previously painted one.

How is it possible to solve this problem so that stars overlap but don't remove eachother?

WebPlayer test: http://jovialart.com/WebPlayer/WebPlayer.html

Thoughts appreciated.

here is script:

var stencil:Texture2D;
var tagFilter:String;
var paintMaterial:Material;

private var tex : Texture2D;
private var stencilUV:Color[];
private var i:int;
private var pixelUV;

function Start(){
    stencilUV = new Color[stencil.width * stencil.height];
    tex = new Texture2D (1024,1024, TextureFormat.ARGB32, false);
    //ReadStencilTexture();
}


function Update () {
    if(DetectPaintable(tagFilter)){
        CreateStencil(pixelUV.x,pixelUV.y,stencil);
    }
}

function DetectPaintable(tagFilter:String):boolean{
    // Only if we hit something, do we continue
    var hit : RaycastHit;
    if(Physics.Raycast (camera.ScreenPointToRay(Input.mousePosition), hit)){
    if (hit.transform.gameObject.tag == tagFilter){
    // Only when we press the mouse
    if (!Input.GetMouseButton (0))
        return;
    // Just in case, also make sure the collider also has a renderer
    // material and texture. Also we should ignore primitive colliders.
    var renderer : Renderer = hit.collider.renderer;
    var meshCollider = hit.collider as MeshCollider;
    if (renderer == null || renderer.sharedMaterial == null ||
        renderer.sharedMaterial.mainTexture == null || meshCollider == null)
        return;

    pixelUV= hit.textureCoord;
    pixelUV.x *= tex.width;
    pixelUV.y *= tex.height;
    return true;
    }
    }
}

function CreateStencil(x:int,y:int, texture:Texture2D){
    paintMaterial.mainTexture = tex;
    for (var xPix =0; xPix<texture.width; xPix++){
        for (var yPix=0;yPix<texture.height; yPix++){
                stencilUV[i] = texture.GetPixel (xPix,yPix) * texture.GetPixel (xPix,yPix).a + tex.GetPixel((x -texture.width/2) +xPix, (y -texture.height/2)+yPix) * (1-texture.GetPixel(xPix,yPix).a); // <-----
            i++;
        }
    }
    i=0;
    tex.SetPixels(x -texture.width/2, y-texture.height/2,texture.width,texture.height,stencilUV);
    tex.Apply();
}