问在THREE.js中获取顶点着色后的变换顶点位置

EN

//render the pass into the buffer
renderer.render( rttScene, rttCamera, rttTexture, true );

// ...


//allocate an array to take the data from the buffer
var width = rttTexture.width;
var height = rttTexture.height;
var pixels = new Uint8Array(4 * width * height); 


//get gl context bind buffers, read pixels
var gl = renderer.context; 
var framebuffer = rttTexture.__webglFramebuffer;
gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);        
gl.viewport(0, 0, width, height);
gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);