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# Shadow Silhouette Maps Pradeep Sen Mike Cammarano Pat Hanrahan Stanford University PowerPoint PPT Presentation

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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Speaker: Alvin

Date: 8/24/2003

SIGGRAPH 2003

### Outline

• Introduction

• Algorithm

• Result

• Artifacts

• Conclusion & Future Work

### Introduction

• Silhouette

Geometry

Silhouette

• Shadow Map + Silhouette Information

### Outline

• Introduction

• Algorithm

• Result

• Artifacts

• Conclusion & Future Work

### Algorithm

• Criteria

• Abstract

• Input

• Depth Test & Shadow Configurations

• Generating the Silhouette Map

### 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.

### Input

• Silhouette Edge (Geometry Information)

### Outline

• Introduction

• Algorithm

• Result

• Artifacts

• Conclusion & Future Work

### 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.

### Outline

• Introduction

• Algorithm

• Result

• Artifacts

• Conclusion & Future Work

### Outline

• Introduction

• Algorithm

• Result

• Artifacts

• 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.