javascript - 三个 JS 从原始 javascript ArrayBuffer 加载纹理

Question

给定一个带有图像二进制数据和扩展名(jpg、png 等)的 Javascript ArrayBuffer我想创建一个 ThreeJS 纹理(不执行任何 HTTP 请求或文件加载，因为我已经有了二进制信息)。

例如假设我有:

var binaryData = getBinaryData(); // this returns an ArrayBuffer with the image, for this example we assume is a PNG image.
var imageFormat = "png";

(我们还有其他纹理属性，如环绕模式、mipmap 等)

如何加载纹理？

我们将不胜感激。

Answer 1

如果将二进制数据数组转换为 base64 字符串。然后，您可以将它附加到 Image 对象，然后将 Image 对象与 Three.js Texture 一起使用。

// Convert the array of data into a base64 string
var stringData = String.fromCharCode.apply(null, new Uint16Array(jpgData));
var encodedData = window.btoa(stringData);
var dataURI = "data:image/jpeg;base64," + encodedData;

// Connect the image to the Texture
var texture = new THREE.Texture();

var image = new Image();
image.onload = function () {
    texture.image = image;
    texture.needsUpdate = true;
};
image.src = dataURI;

这是完整的代码(猫的图像是故意低分辨率的):

var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );

var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

var jpgData = new Uint8Array([255,216,255,224,0,16,74,70,73,70,0,1,1,0,0,1,0,1,0,0,255,254,0,62,67,82,69,65,84,79,82,58,32,103,100,45,106,112,101,103,32,118,49,46,48,32,40,117,115,105,110,103,32,73,74,71,32,74,80,69,71,32,118,54,50,41,44,32,100,101,102,97,117,108,116,32,113,117,97,108,105,116,121,10,255,219,0,67,0,8,6,6,7,6,5,8,7,7,7,9,9,8,10,12,20,13,12,11,11,12,25,18,19,15,20,29,26,31,30,29,26,28,28,32,36,46,39,32,34,44,35,28,28,40,55,41,44,48,49,52,52,52,31,39,57,61,56,50,60,46,51,52,50,255,219,0,67,1,9,9,9,12,11,12,24,13,13,24,50,33,28,33,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,255,192,0,17,8,0,24,0,24,3,1,34,0,2,17,1,3,17,1,255,196,0,31,0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,255,196,0,181,16,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,125,1,2,3,0,4,17,5,18,33,49,65,6,19,81,97,7,34,113,20,50,129,145,161,8,35,66,177,193,21,82,209,240,36,51,98,114,130,9,10,22,23,24,25,26,37,38,39,40,41,42,52,53,54,55,56,57,58,67,68,69,70,71,72,73,74,83,84,85,86,87,88,89,90,99,100,101,102,103,104,105,106,115,116,117,118,119,120,121,122,131,132,133,134,135,136,137,138,146,147,148,149,150,151,152,153,154,162,163,164,165,166,167,168,169,170,178,179,180,181,182,183,184,185,186,194,195,196,197,198,199,200,201,202,210,211,212,213,214,215,216,217,218,225,226,227,228,229,230,231,232,233,234,241,242,243,244,245,246,247,248,249,250,255,196,0,31,1,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,255,196,0,181,17,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,119,0,1,2,3,17,4,5,33,49,6,18,65,81,7,97,113,19,34,50,129,8,20,66,145,161,177,193,9,35,51,82,240,21,98,114,209,10,22,36,52,225,37,241,23,24,25,26,38,39,40,41,42,53,54,55,56,57,58,67,68,69,70,71,72,73,74,83,84,85,86,87,88,89,90,99,100,101,102,103,104,105,106,115,116,117,118,119,120,121,122,130,131,132,133,134,135,136,137,138,146,147,148,149,150,151,152,153,154,162,163,164,165,166,167,168,169,170,178,179,180,181,182,183,184,185,186,194,195,196,197,198,199,200,201,202,210,211,212,213,214,215,216,217,218,226,227,228,229,230,231,232,233,234,242,243,244,245,246,247,248,249,250,255,218,0,12,3,1,0,2,17,3,17,0,63,0,225,109,238,89,177,194,175,3,160,56,198,63,90,232,23,193,58,181,198,129,246,255,0,48,91,73,52,196,37,147,225,119,192,49,243,111,45,158,73,29,187,142,213,204,197,117,246,11,104,101,154,88,124,180,145,72,81,247,136,207,183,30,181,239,190,36,188,211,99,68,185,242,148,164,113,121,145,180,127,119,102,51,159,166,43,139,15,77,89,201,149,177,226,44,230,81,37,188,214,234,251,91,107,28,228,238,29,206,79,255,0,90,138,154,242,120,230,19,72,176,198,190,103,207,251,179,157,217,25,200,205,21,196,147,111,64,122,144,216,248,87,251,98,55,143,85,185,158,210,220,169,116,40,60,204,55,24,227,191,83,233,94,129,117,168,19,225,187,125,29,165,23,119,73,103,37,164,183,112,40,10,160,0,17,182,158,229,120,227,184,162,138,214,150,42,106,45,89,21,73,123,73,53,35,137,26,4,176,69,228,137,51,110,16,236,221,130,216,3,140,154,40,162,176,246,175,153,232,67,220,255,217]);


// Convert the array of data into a base64 string
var stringData = String.fromCharCode.apply(null, new Uint16Array(jpgData));
var encodedData = window.btoa(stringData);
var dataURI = "data:image/jpeg;base64," + encodedData;

// Connect the image to the Texture
var texture = new THREE.Texture();

var image = new Image();
image.onload = function () {
	texture.image = image;
	texture.needsUpdate = true;
};
image.src = dataURI;


var geometry = new THREE.PlaneBufferGeometry(1, 1);
var material = new THREE.MeshBasicMaterial({map: texture});
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );

camera.position.z = 1;

var render = function () {
	requestAnimationFrame( render );

	renderer.render(scene, camera);
};

render();

<html>
	<head>
		<style>
			body { margin: 0; }
			canvas { width: 100%; height: 100% }
		</style>
	</head>
	<body>
		<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
	</body>
</html>