Three.js 使用模板缓冲区 [英] Three.js usage with stencil buffer

问题描述

我无法将场景绘制到创建为模板蒙版的形状中.相反，代码似乎只是将模板本身呈现为黑色对象.

I can't get the following to draw the scene into the shape created as a stencil mask. Instead the code just seems to render the stencil itself as a black object.

http://signaturefloors.dev.flooradvisor.com.au/productapp/floor_align.php

我的渲染功能是:

var gl = floor_align.renderer.domElement.getContext('webgl') || floor_align.renderer.domElement.getContext('experimental-webgl');
gl.clearStencil(0);
gl.clear(gl.STENCIL_BUFFER_BIT);
gl.enable(gl.STENCIL_TEST);
gl.stencilFunc(gl.ALWAYS, 1, 1);
gl.stencilOp(gl.KEEP, gl.REPLACE, gl.REPLACE);
gl.colorMask(0, 0, 0, 0);

// Floor Mask (Create a stencil that we render the next pass into)
floor_align.renderer.render(floor_align.maskScene, floor_align.maskCamera);

gl.colorMask(1, 1, 1, 1);
gl.stencilFunc(gl.NOTEQUAL, 1, 1);
gl.stencilOp(gl.KEEP, gl.REPLACE, gl.REPLACE);

// Render a floor pass
floor_align.renderer.render(floor_align.scene, floor_align.camera);

gl.disable(gl.STENCIL_TEST);

渲染器有autoClear = false;

推荐答案

通过反复试验，我将代码更新为这个，现在它可以工作了.清除深度缓冲区似乎特别重要，所以我想我的面具一定隐藏了更远的地板碎片.

Through trial and error I updated my code to this and it now works. Clearing the depth buffer seems particularly important so I guess my mask must have been hiding the more distant floor fragments.

// Render the scene
function fla_render() {

    floor_align.renderer.clear();

    // Background
    //floor_align.renderer.render(floor_align.scene, floor_align.camera);

    floor_align.renderer.clearDepth();

    var gl = floor_align.renderer.domElement.getContext('webgl') || floor_align.renderer.domElement.getContext('experimental-webgl');

    // Clear the stencil buffer
    gl.clearStencil(0);
    gl.clear(gl.STENCIL_BUFFER_BIT);

    // Replacing the values at the stencil buffer to 1 on every pixel we draw
    gl.stencilFunc(gl.ALWAYS, 1, 1);
    gl.stencilOp(gl.KEEP, gl.REPLACE, gl.REPLACE);

    // Disable color (u can also disable here the depth buffers)
    gl.colorMask(false, false, false, false);

    // Write to stencil
    gl.enable(gl.STENCIL_TEST);

    // Floor Mask (Create a stencil that we render the next pass into)
    floor_align.renderer.render(floor_align.maskScene, floor_align.maskCamera);

    // Telling the stencil now to draw/keep only pixels that equals 1 - which we set earlier
    gl.stencilFunc(gl.EQUAL, 1, 1);
    gl.stencilOp(gl.KEEP, gl.KEEP, gl.KEEP);

    // Clear depth buffer (seems important)
    floor_align.renderer.clearDepth();

    // Enable color
    gl.colorMask(true, true, true, true);

    // Render a floor pass
    floor_align.renderer.render(floor_align.scene, floor_align.camera);

    // Disable stencil test;
    gl.disable(gl.STENCIL_TEST);

}

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