Description

I am using a shader to write to a 3D render target.
To debug the result I am using renderer.readRenderTargetPixels()

The result for WebGLRenderTarget is correct, the result for WebGL3DRenderTarget is all zero.

Reproduction steps

Please check the fiddle:

1. First run as is and check the output on the console: the buffer contains 0,0,0,255
2. Now go to line 66 and enable the line with WebGLRenderTarget and disable the line with WebGL3DRenderTarget
3. The output now is correct: 102, 255, 15, 255

Code

See fiddle for complete example.

//-- 3D or 2D Render target
// brushTarget = new THREE.WebGLRenderTarget(32, 32) 
brushTarget = new THREE.WebGL3DRenderTarget(32, 32, 32)


var layer=0;   // Layer in 3D Texture

renderer.setRenderTarget(brushTarget, layer);
renderer.render( brushScene, brushCamera );    
    
var buffer = new Uint8Array(4); 
renderer.readRenderTargetPixels(brushTarget, 16, 16, 1, 1, buffer, layer)

console.log("Debug read brush", buffer)   // Press F12 to show chrome console

Live example

https://jsfiddle.net/92xa60g4/25/

Screenshots

No response

Version

r164

Device

Desktop

Browser

Chrome

OS

Windows