CODEWITHSUNDEEP
three.js
wereHamster
wereHamster

Reputation: 487

Canvas not cleared when using EffectComposer

When using the WebGLRenderer directly the background is automatically cleared with a white color. However, when using the EffectComposer the background is cleared with black color instead.

Here is an example: http://jsfiddle.net/wereHamster/Lt2DX/. The scene shows a red cube on white background. If you comment out line 41 and uncomment line 42 (enabling the EffectComposer), the canvas will show a red cube on black background.

Here is the code:

# A simple scene with a red cube in the center.
scene = new THREE.Scene

camera = new THREE.PerspectiveCamera 75, 200/200, 0.01, 1000
camera.position.z = 5
scene.add camera

geometry = new THREE.CubeGeometry 1, 1, 1
material = new THREE.MeshBasicMaterial { color: 0xFF0000 }
scene.add (mesh = new THREE.Mesh geometry, material)


# The barebone WebGL renderer.
renderer = new THREE.WebGLRenderer
renderer.setSize 200, 200
$('body').append renderer.domElement


# Composer with two passes, RenderPass and ShaderPass.
composer   = new THREE.EffectComposer renderer

renderPass = new THREE.RenderPass scene, camera
composer.addPass renderPass

shaderPass = new THREE.ShaderPass THREE.CopyShader
shaderPass.renderToScreen = true
composer.addPass shaderPass


# The main animation loop.
animate = ->
    requestAnimationFrame animate

    mesh.rotation.x += 0.01
    mesh.rotation.y += 0.01


    # If we use the composer to render the scene then the
    # background is black instead of white.

    renderer.render scene, camera
    #composer.render 0.1


animate()

Upvotes: 0

Views: 1041

Answers (1)

WestLangley
WestLangley

Reputation: 104793

THREE.RenderPass has additional arguments

renderPass = new THREE.RenderPass scene, camera, null, new THREE.Color().setHex( 0xffffff ), 0

Also, the renderer by default has a clear, not white, background. What you are seeing is body color showing through.

fiddle: http://jsfiddle.net/Lt2DX/36/

Upvotes: 4

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