Shadow silhouette maps pradeep sen mike cammarano pat hanrahan stanford university
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Shadow Silhouette Maps Pradeep Sen Mike Cammarano Pat Hanrahan Stanford University. Speaker: Alvin Date: 8/24/2003 SIGGRAPH 2003. Outline. Introduction Algorithm Result Artifacts Conclusion & Future Work. Introduction. Silhouette Shadow Map Shadow Volume

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Shadow Silhouette Maps Pradeep Sen Mike Cammarano Pat Hanrahan Stanford University

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Shadow silhouette maps pradeep sen mike cammarano pat hanrahan stanford university

Shadow Silhouette MapsPradeep Sen Mike Cammarano Pat HanrahanStanford University

Speaker: Alvin

Date: 8/24/2003

SIGGRAPH 2003


Outline

Outline

  • Introduction

  • Algorithm

  • Result

  • Artifacts

  • Conclusion & Future Work

Shadow Silhouette Maps


Introduction

Introduction

  • Silhouette

  • Shadow Map

  • Shadow Volume

  • Shadow Silhouette Map

Geometry

Silhouette

Shadow Silhouette Maps


Shadow map

Shadow Map

Shadow Silhouette Maps


Shadow map1

Shadow Map

Shadow Silhouette Maps


Shadow volume

Shadow Volume

Shadow Silhouette Maps


Shadow volume1

Shadow Volume

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Shadow silhouette map

Shadow Silhouette Map

  • Shadow Map + Silhouette Information

Shadow Silhouette Maps


Outline1

Outline

  • Introduction

  • Algorithm

  • Result

  • Artifacts

  • Conclusion & Future Work

Shadow Silhouette Maps


Algorithm

Algorithm

  • Criteria

  • Abstract

  • Input

  • Depth Test & Shadow Configurations

  • Generating the Silhouette Map

  • Shadow Rendering

Shadow Silhouette Maps


Criteria

Criteria

  • The representation must guarantee a continuous shadow boundary.

  • The information has to be easy to store in a texture.

  • There is only one silhouette point in each texel; only the last point will be stored.

Shadow Silhouette Maps


Abstract

Abstract

Shadow Silhouette Maps


Input

Input

  • Shadow Map

  • Silhouette Edge (Geometry Information)

Shadow Silhouette Maps


Depth test shadow configurations

Depth Test & Shadow Configurations

Shadow Silhouette Maps


Generating the silhouette map

Generating the Silhouette Map

Shadow Silhouette Maps


Generating the silhouette map1

Generating the Silhouette Map

Shadow Silhouette Maps


Shadow rendering

Shadow Rendering

Shadow Silhouette Maps


Outline2

Outline

  • Introduction

  • Algorithm

  • Result

  • Artifacts

  • Conclusion & Future Work

Shadow Silhouette Maps


Result

Result

(Left) Standard shadow map. (Center) Shadow volumes. (Right) Silhouette map.

Shadow Silhouette Maps


Result1

Result

Shadow Silhouette Maps


Result2

Result

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Result3

Result

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Result4

Result

Scene fill: The number of fragments rendered to draw the scene without shadows.

Volume fill: The number of fragments drawn when rendering the shadow volume geometry.

Silhouette fill: The number of fragments that pass through silhouette.

O: The ratio of volume fill to scene fill is the overdraw factor O.

P: The ratio of silhouette fill to scene fill is the percentage P.

Shadow Silhouette Maps


Outline3

Outline

  • Introduction

  • Algorithm

  • Result

  • Artifacts

  • Conclusion & Future Work

Shadow Silhouette Maps


Artifacts

Artifacts

Shadow Silhouette Maps


Artifacts1

Artifacts

Shadow Silhouette Maps


Outline4

Outline

  • Introduction

  • Algorithm

  • Result

  • Artifacts

  • Conclusion & Future Work

Shadow Silhouette Maps


Conclusion future work

Conclusion & Future Work

  • Significantly improves the quality of shadow mapped images.

  • Simple and runs in real time.

  • Finding the better silhouette representations out.

  • Extending to soft shadow algorithms.

  • Implementing the algorithm in hardware.

Shadow Silhouette Maps


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