三.js在webgl中绘制线性渐变纹理 [英] Three.Js draw linear gradient texture in webgl

问题描述

对于画布渲染器，我使用了一个绘制线性渐变的函数.我希望它也能与 webgl 渲染器一起使用，但它会阻碍透明度.代码在下面，这里是一个小提琴链接，它说明了我的意思.

With canvas renderer, I am using a function that draws a linear gradient. I would like this to work with the webgl renderer as well, but it chokes on transparency. The code is below and here is a link to a fiddle which demonstrates what I mean.

function generateTexture() {

var size = 512;

// create canvas
canvas = document.createElement( 'canvas' );
canvas.width = size;
canvas.height = size;

// get context
var context = canvas.getContext( '2d' );

// draw gradient
context.rect( 0, 0, size, size );
var gradient = context.createLinearGradient( 0, 0, size, size );
gradient.addColorStop(0, '#99ddff'); // light blue 
gradient.addColorStop(1, 'transparent');
context.fillStyle = gradient;
context.fill();

return canvas;

}

推荐答案

对于WebGLRenderer，需要设置material.transparent = true.

var material = new THREE.MeshBasicMaterial( { map: texture, transparent: true } );

更新小提琴:http://jsfiddle.net/FtML5/3/

three.js r.62

three.js r.62

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