TRAAPassNode: Incomplete MRT support.

[ligaofeng0901]

Description

If we add some other postprocessing node after TRAA, we got a black screen.
It appears that TRAA can not work with other MRT, it only takes two textures as output when rendering pass.
https://jsfiddle.net/ligaofeng0901/g0u9qdb6/14/
I created a demo. In this demo, traa and bloom doesn't work fine together. Or, my usage of traa is not a proper way?

Reproduction steps

Code

// code goes here

Live example

• jsfiddle-latest-release WebGLRenderer
• jsfiddle-dev WebGLRenderer
• jsfiddle-latest-release WebGPURenderer
• jsfiddle-dev WebGPURenderer

Screenshots

No response

Version

0.170.0

Device

No response

Browser

No response

OS

No response

[Mugen87]

It appears that TRAA can not work with other MRT, it only takes two textures as output when rendering pass.

It is known limitation that TRAAPassNode is not MRT ready yet, see #29636 (comment).

You can see corresponding warnings in the browser console for both WebGL and WebGPU. The root cause is the resolve step which only works with the beauty pass so far (but not with other MRT outputs).

[ligaofeng0901]

Thanks! It is clear to me now.