WebGL - 带高度图的纹理地形 [英] WebGL - Textured terrain with heightmap

问题描述

我正在尝试使用 WebGL 创建 3D 地形.我有一个带有地形纹理的 jpg，还有另一个带有高度值(-1 到 1)的 jpg.

我查看了各种包装器库(如 SpiderGL 和 Three.js)，但我找不到合适的示例，如果我这样做(如在 Three.js 中)，代码没有记录，我可以'不知道怎么做.

谁能给我一个好的教程或例子?

Three.js 中有一个例子 http://mrdoob.github.com/three.js/examples/webgl_geometry_terrain.html 这几乎是我想要的.问题是它们随机创建了山脉的颜色和高度值.我想从 2 个不同的图像文件中读取这些值.

任何帮助都会得到帮助.谢谢

解决方案

在 GitHub 上查看这篇文章:

https://github.com/mrdoob/three.js/issues/1003

florianf 链接的示例帮助我能够做到这一点.

function getHeightData(img) {var canvas = document.createElement('canvas');画布宽度 = 128;画布高度 = 128;var context = canvas.getContext('2d');var size = 128 * 128, data = new Float32Array( size );context.drawImage(img,0,0);for ( var i = 0; i < size; i ++ ) {数据[i] = 0}var imgd = context.getImageData(0, 0, 128, 128);var pix = imgd.data;无功j=0;for (var i = 0, n = pix.length; i 

演示:http://oos.moxiecode.com/js_webgl/terrain/index.html

I'm trying to create a 3D terrain using WebGL. I have a jpg with the texture for the terrain, and another jpg with the height values (-1 to 1).

I've looked at various wrapper libraries (like SpiderGL and Three.js), but I can't find a sutable example, and if I do (like in Three.js) the code is not documented and I can't figure out how to do it.

Can anyone give me a good tutorial or example?

There is an example at Three.js http://mrdoob.github.com/three.js/examples/webgl_geometry_terrain.html which is almost what I want. The problem is that they create the colour of the mountains and the height values randomly. I want to read these values from 2 different image files.

Any help would be appriciated. Thanks

解决方案

Check out this post over on GitHub:

https://github.com/mrdoob/three.js/issues/1003

The example linked there by florianf helped me to be able to do this.

function getHeightData(img) {
    var canvas = document.createElement( 'canvas' );
    canvas.width = 128;
    canvas.height = 128;
    var context = canvas.getContext( '2d' );

    var size = 128 * 128, data = new Float32Array( size );

    context.drawImage(img,0,0);

    for ( var i = 0; i < size; i ++ ) {
        data[i] = 0
    }

    var imgd = context.getImageData(0, 0, 128, 128);
    var pix = imgd.data;

    var j=0;
    for (var i = 0, n = pix.length; i < n; i += (4)) {
        var all = pix[i]+pix[i+1]+pix[i+2];
        data[j++] = all/30;
    }

    return data;
}

Demo: http://oos.moxiecode.com/js_webgl/terrain/index.html

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