Comments (8)
ow, its an easy fix
http://stackoverflow.com/questions/12273858/how-to-make-webgl-canvas-transparent
tried that, works fine now..
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hmm, but the alpha is now out in chrome
from pixijs.
so close! ya could try try removing the premultipliedAlpha from thw webGL creation context?
from pixijs.
I'm also having issues with transparent background with WebGL renderer. Background is transparent only in Opera, new Safari, Chrome and Firefox with WebGL leaves it green.
<html>
<head>
<title>Playground</title>
<style>
body {
margin: 0;
padding: 0;
background-color: #000000;
}
#circle {
display: none;
}
</style>
</head>
<body>
<canvas id="circle" width="300" height="300"></canvas>
<script src="../pixi.js/bin/pixi.js"></script>
<script>
var canvas = document.getElementById('circle');
if (canvas.getContext) {
// Preparing canvas cirlce
var context = canvas.getContext('2d');
context.beginPath();
context.fillStyle = "rgb(255,0,0)";
context.arc(canvas.width/2,canvas.height/2,150,0,Math.PI*2,false);
context.fill();
context.closePath();
// create an new instance of a pixi stage
var stage = new PIXI.Stage(0x66FF99);
var renderer = PIXI.autoDetectRenderer(500, 500, null, true);
document.body.appendChild(renderer.view);
var circleTexture = PIXI.Texture.fromCanvas(document.getElementById("circle"));
var circle = new PIXI.Sprite(circleTexture);
circle.position.x = 100;
circle.position.y = 100;
stage.addChild(circle);
function animate() {
renderer.render(stage);
requestAnimFrame( animate );
}
requestAnimFrame(animate);
} else {
alert("At least HTML5 Canvas support required");
}
</script>
</body>
</html>
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Looks like this is fixed in the dev branch by this commit: a479e27
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Looks like the bug still persists. I'm using the same code above and the latest pixi from master (1.2.0), but background of the stage isn't transparent in Safari and FF. In Chrome and Opera everything is fine.
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I can confirm that this bug still persists when using the WebGLRenderer. If you open http://jsfiddle.net/SamFent/yvh4k/ in FireFox, you will see that the background is opaque and covers the text behind the canvas.
The basic fix for this seems to be fairly simple: when we are requesting a transparent background, it seems we have to use gl.clearColor(0,0,0,0).
Making this simple change fixes the issue in FireFox:
However, this fix alone introduces a weird antialiasing issue in Chrome. In my example above with the nicely-rendered svg spheres with gradients, we suddenly get an ugly grey line around the spheres that seems to have been caused by the clipping of the edges:
The fix for this seems to be to set premultipliedAlpha to true (where it was before the fix above (a479e27) was applied). Setting premultipliedAlpha: true returns the svg images to being rendered without ugly clipping:
I have added a pull request for this fix here: #345
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This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
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