Always white background, ¿how make it transparent?

Description of the bug

Always getting a white background, but I need to keep the alpha of the renderer.

To Reproduce

It’s a very basic code.

const renderer = new window.THREE.WebGLRenderer({
          canvas,
          alpha: true,
          powerPreference: 'high-performance',
          antialias: false,
          stencil: false,
          depth: false,
        })
        renderer.autoClear = false
        renderer.setSize(canvasWidth, canvasHeight)
        renderer.setClearColor(0xffffff, 0)
        renderer.toneMapping = THREE.ACESFilmicToneMapping
        renderer.toneMappingExposure = 0.9
        renderer.physicallyCorrectLights = true

        // Vanrue
        const composer = new EffectComposer(renderer)
        const renderPass = new RenderPass(scene, camera)
        const bloomEffect = new BloomEffect({
          intensity: 1.4,
          luminanceThreshold: 0.6,
          luminanceSmoothing: 0.1,
          kernelSize: KernelSize.SMALL,
        })
        const ePass = new EffectPass(camera, bloomEffect)
        const smaaImageLoader = new SMAAImageLoader()
        smaaImageLoader.load((e) => {
          const smaaEffect = new SMAAEffect(e[0], e[1])
          smaaEffect.edgeDetectionMaterial.setEdgeDetectionThreshold(0.05)
          const smaaPass = new EffectPass(camera, smaaEffect)
          composer.addPass(smaaPass)
        })

        composer.addPass(renderPass)
        // composer.addPass(ePass)

Expected behavior

Keep the alpha of native WebGLRenderer.

Screenshots

Without.

With.

Library versions used

• Three: R124
• Post Processing: 6.21.3

Desktop

Is a mobile AR, not for desktop.

Mobile

• Device: Huawei p30
• OS: Android 10
• Browser: Chrome 90.0.4430.66

[Mateo150]

Watching everythis is due to the platform 8thwall (user for AR apps), wich when you use Post always make white brackground.

Your postprocessing is awesome! Where can I buy you a beer?

[UMUTBAYGUT]

@MrMateo7 Why you used new window.THREE.WebGLRenderer instead of 8thWall Renderer?