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@@ -1,15 +1,5 @@
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/**
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- * @author bhouston / http://clara.io/
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- *
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- * NOTE: Accumulating a lot of samples with a 8-bit-per-channel RGB/RGBA buffer will
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- * lead to discretization effects. For accurate sample accumulation use a floating
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- * point buffer.
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- *
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- * It is also possible to reduce the discretization effects by having more buffers
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- * and doing less combines. So render to 4 buffers and combine them 4 times for
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- * 16 samples and you'll get 4x less discretization artifacts and then current
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- * approach.
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- *
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+ * @author bhouston / http://clara.io/ *
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*/
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THREE.MSAAPass = function ( scene, camera, params ) {
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@@ -42,7 +32,7 @@ THREE.MSAAPass = function ( scene, camera, params ) {
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transparent: true,
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blending: THREE.CustomBlending,
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blendSrc: THREE.OneFactor,
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- blendDst: THREE.OneFactor,
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+ blendDst: THREE.OneMinusSrcAlphaFactor,
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blendEquation: THREE.AddEquation,
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depthTest: false,
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depthWrite: false
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@@ -89,7 +79,8 @@ THREE.MSAAPass.prototype = {
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var jitterOffsets = THREE.MSAAPass.JitterVectors[ Math.max( 0, Math.min( this.sampleLevel, 5 ) ) ];
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this.uniforms[ "tForeground" ].value = this.sampleRenderTarget;
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- this.uniforms[ "scale" ].value = 1.0 / jitterOffsets.length;
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+
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+ var weight = 1.0;
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// render the scene multiple times, each slightly jitter offset from the last and accumulate the results.
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for( var i = 0; i < jitterOffsets.length; i ++ ) {
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@@ -99,7 +90,11 @@ THREE.MSAAPass.prototype = {
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renderer.render( this.scene, camera, this.sampleRenderTarget, true );
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- // clear on the first render, accumulate the others
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+ // this accumulation strategy is used to prevent decimation at low bit depths with lots of samples.
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+ this.uniforms[ "scale" ].value = weight;
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+ weight *= 0.5;
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+
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+ // clear on the first render, accumulate the others
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var autoClear = renderer.autoClear;
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renderer.autoClear = false;
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renderer.render( this.scene2, this.camera2, writeBuffer, i === 0 );
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Ben Houston