Can you provide tips on saving an image from a Three.js canvas?
I'm having trouble making Canvas2Image work with Threejs. The issue seems to arise because the canvas object needs a div to be attached to before it is defined.
Check out this resource for more information:
When it comes to using the toDataURL method with a canvas HTML element in 3D context, there are some key considerations to keep in mind.
Firstly, ensure that when initializing the 3D context, you set the preserveDrawingBuffer flag to true:
var context = canvas.getContext("experimental-webgl", {preserveDrawingBuffer: true});
Next, utilize canvas.toDataURL() to retrieve the image.
For three.js specifically, make sure to include the following when instantiating the renderer:
new THREE.WebGLRenderer({
preserveDrawingBuffer: true
});
It's important to note that this approach can impact performance. (See: https://github.com/mrdoob/three.js/pull/421#issuecomment-1792008)
This technique is meant for webgl renderer only. In the case of three.js canvasRenderer, you can simply use renderer.domElement.toDataURL(); without any additional initialization parameter.
Check out my webgl experiment: http://jsfiddle.net/TxcTr/3/, and press 'p' to take a screenshot.
Credit to gaitat; I discovered this answer by following the link provided in their comment.
After reviewing the discussion initiated by Dinesh (https://github.com/mrdoob/three.js/pull/421#issuecomment-1792008), I devised a solution that ensures optimal performance without causing any slowdown in your application.
function render() {
requestAnimationFrame(render);
renderer.render(scene, camera);
if(getImageData == true){
imgData = renderer.domElement.toDataURL();
getImageData = false;
}
}
By implementing this solution, you can maintain the preserveDrawingBuffer flag at false and still extract images from THREE.js effortlessly. Just set getImageData to true, invoke render(), and you're all set.
getImageData = true;
render();
console.debug(imgData);
I trust this provides assistance to individuals like myself who prioritize achieving high frame rates :)
Using the canvas element, you can generate a URL that allows for downloading.
function createDownloadableImage(fileName) {
var canvas = document.getElementById("canvas");
var url = canvas.toDataURL();
var link = document.createElement('a');
link.setAttribute('href', url);
link.setAttribute('target', '_blank');
link.setAttribute('download', fileName);
link.click();
}
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