weighted blended order independent transparency

Weighted blended order independent transparency

Weighted Blended Order-Independent TransparencyMorgan MacGuireLouis BavoilNVIDIA

Journal of Computer Graphics Techniques Vol. 2, No. 2, 2013

blendingOver operatorblendingOITNew methodFuture work

1

Abstract, .Order-Independent Transparency (OIT).OVEROIT. 2

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,

1. : (unsorted OVER), : OIT 3

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OIT DEMODEMO4

Porter & Duff OVER Compositing,

OVER operator [Porter and Duff 1984]

glBlendEquation(GL_FUNC_ADD)

glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA)5

OVER COMPOSITING,

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OVER COMPOSITING, 7

OVER COMPOSITING, 8

OVER COMPOSITING,

Order Independent Part

Order dependent Part9

Porter & Duff OVER Compositing, OVERCompositiongA-buffer:

(unbounded) 10

Key-ideasOrder-independent transparency , .Stochastic Transparency, CSAA, etcZ.Bounded A-Buffer, Stencil Routed K-buffer, Stencil Routed A-Buffer, etc. Fourier Opacity Mapping, etcCompositing operator. Order-Independent Transparency.

GPU..

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blended OIT (meshkins)Order-independent transparency 2007, MeshkinCompositing operator.12

blended OIT (meshkins)Order-independent transparency

.. .

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blended OIT (meshkins) EXAMPLEOrder-independent transparency

Sorted, =0.25Approx, =0.2514

blended OIT (meshkins) EXAMPLEOrder-independent transparency Sorted, =0.5Approx, =0.5

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blended OIT (meshkins) implementationOrder-independent transparency

. MeshkinOpenGL

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Blended oit ADVANTAGESOrder-independent transparency 17DX11-class GPUs (PS4, XboxOne, NVIDIA 2010~ , AMD 2009~, Intel 2012~)DX9-class GPUs (Xbox360, PS3, WiiU, NVIDIA 2003~, AMD 2002~, Intel 2005~)OpenGL ES 3.0 GPUs (with half float) (PowerVR G6430, Tegra K1, iphone 5s)WebGL1(with float texture) , WebGL2 8-bit

blended OIT (BAVOIL AND MYERS)Order-independent transparency 2008, BavoilMeshkin. 18

blended OIT (BAVOIL AND MYERS)Order-independent transparency Cwa, Composition Operator.4

Ci19

blended OIT (BAVOIL AND MYERS)Order-independent transparency

Ci

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blended OIT (BAVOIL AND MYERS)Order-independent transparency 2008, BavoilMeshkin. Composition Operator.MultiRenderingTarget16-bit float blending.21

blended OIT (BAVOIL AND MYERS) DEMOOrder-independent transparency DEMO22

blended OIT (BAVOIL AND MYERS) implementationOrder-independent transparency

3. Bavoil, MyersOpenGL

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2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

Aavg24

Depth weight function2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

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Depth weight function2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency (0.1 < |z| < 500, 16-bit float buffer)

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Depth weight function2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

4.

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implementeation2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

accumTexture.rgbaccumTexture.aRevealage

Coverage

revealageTexture.r28

implementeation2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

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Implementeation (for restricted platform)2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

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RenderTargetblendingC, Alphablending.

RESULTs2013 new weighted blended OIT (BAVOIL and MacGuire) Order-independent transparency

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5. CAD33


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weighted blended order independent transparency

Engineering