SSAARenderPass affects color and contrast when increasing the sampleLevel

Describe the bug

SSAARenderPass will affect color on dark materials. I suppose it should only do antialiasing. Using the gammaCorrection as well, increases the effect drastically. The problem seems to be the sampleLevel property. When set to 1, it is not noticable, but when increasing the value, pretty fast contrast increases as well

To Reproduce https://jsfiddle.net/em3crz91/2/

  SSAA = new THREE.SSAARenderPass(scene, camera, 0x000000, 0);
  SSAA.sampleLevel = 4;

Expected behavior

Should not affect any color or material. Its for antialiasing only

• Device: Desktop
• OS: Windows, MacOS
• Browser: Chrome, Firefox, Safari
• Three.js version: r122

[Mugen87]

This precision related issue is caused by render target’s default texture type . You can mitigate it by strictly using THREE.FloatType. Check out the difference here:

https://jsfiddle.net/wh9kojde/

This issue was also discussed at the forum: https://discourse.threejs.org/t/effect-composer-gamma-output-difference/12039

[gianoseduto]

This precision related issue is caused by render target’s default texture type . You can mitigate it by strictly using THREE.FloatType. Check out the difference here:

https://jsfiddle.net/wh9kojde/

This issue was also discussed at the forum: https://discourse.threejs.org/t/effect-composer-gamma-output-difference/12039

The solution in the fiddle present the same problem I am experiencing right now with SSAARenderPass: it makes all the scene white if active, even with low sample value. I don’t understand why and how to fix it, the example seems to be working, am I missing something?

I redefined a renderTarget with type: FloatType but nothing changed.

Edit: this problem appears only from version r139. In r138 SSAARenderPass works fine.