Autodesk LIGHTSCAPE Manual de usuario

$SULO#4<<< 31#93<36034333308355

/LJKWVFDSH

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LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR

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Autodesk Trademarks:

Discreet is a division of Autodesk, Inc. Autodesk, AutoCAD, 3D Studio MAX, 3D Studio VIZ, DXF, and 3D Studio

are registered trademarks, and Lightscape, LSnet, and Discreet are trademarks of Autodesk, Inc. in the USA and/

or other countries.

Third-Party Trademarks:

OpenGL, Open Inventor and Silicon Graphics are trademarks or registered trademarks of Silicon Graphics, Inc.

Microsoft, Windows and Windows NT are registered trademarks of Microsoft Corporation. LightWave 3D is a

registered trademark of NewTek. ArchiCAD and Graphisoft are registered trademarks of Graphisoft R&D

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GOVERNMENT USE

Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in FAR 1 2.212

(Commercial Computer Software-Restricted Rights) and DFAR 227.7202 (Rights in Technical Data and Computer

Software), as applicable.

Third Party Software Program Credits

The software program contains content files licensed by 3Name3D, Santa Monica, CA; Artbeats Software, Inc.,

IMAGETECTS™ in addition to the manufacturers listed in the Acknowledgements at the end of this manual. Please

note that the manufacturers reserve the right to discontinue or change any lighting or other products represented

in the software, and the copyrights to these content files are the property of their respective owners.

Printed in the United States.

Title:

Lightscape User’s Guide

Item No.:

LIUG3.2-01

Publication ID:

1.0

Date:

April, 1999

toc

Table of Contents

1 Introduction 1

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

About Lightscape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Computer Graphics Rendering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Photometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

About Lightscape Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 Installation 11

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Installing Lightscape for the First Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Upgrading from a Previous Version of Lightscape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3 Workflow 13

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preparing the Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Processing the Radiosity Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4 The Interface 17

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Starting Lightscape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Overview of the Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Interface Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Using Toolbars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Using File Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Viewing the Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Controlling the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Selecting Objects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table of Contents

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Lightscape

Transforming Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Setting Document Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Setting System Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

5 Importing Geometry 53

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Common Import Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Importing DXF Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Importing DWG Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Importing .3DS files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Importing a LightWave Scene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Exporting from 3D Studio MAX or 3D Studio VIZ to Lightscape. . . . . . . . . . . . . . . . 72

6 Refining Geometry 81

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

About Refining Geometry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Working with Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Working with Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Modifying Block Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Working with Block Instances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Working with Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

7 Using Materials 103

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

About Material Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Using the Materials Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Workflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Adding Materials to a Scene . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Editing Material Properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Assigning Materials to Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Aligning Textures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

8 Artificial Lighting 129

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

About Luminaires. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

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❚❘❘

Using the Luminaires Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Adding Luminaires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Setting Photometric Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Placing Luminaires in a Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Editing Luminaires. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

Setting Luminaire Surface Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Luminaire Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

9 Photometrics 149

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Using Photometric Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Creating and Editing Photometric Webs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Customized Photometric Web Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

IES Standard File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Using LID Conversion Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

10 Daylight 159

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

About Sunlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

About Skylight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Using Daylight in Exterior Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Interior Model Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Illuminating Your Model with Daylight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Enabling Daylight in Radiosity Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

11 Radiosity Processing 169

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

About Radiosity Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Processing Workflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Setting the Processing Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Setting the Surface Processing Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Initiating the Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Processing the Radiosity Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Changing Materials and Luminaires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Meshing Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184

Reducing Meshing Artifacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Testing for Artifacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Modeling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

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Lightscape

12 Lighting Analysis 195

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

About Lighting Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Displaying Light Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Analyzing Lighting Statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Controlling Analysis Grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

Using Workplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200

13 Mesh to Texture 203

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

About Mesh to Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Using Mesh to Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Mesh to Texture Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

14 Rendering 213

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

About Rendering in Lightscape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Creating Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

Rendering Multiple Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Ray Tracing an Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219

Rendering Large Jobs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Rendering Across a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

15 Animation 221

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

About Animation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221

Defining the Camera Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

Setting Camera Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

Varying the Camera Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

Saving Animation Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

Playing Back Animations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

Using Animation Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238

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16 Exporting 241

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

Exporting Panoramic Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

Exporting VRML Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Importing Solution Files into Modeling Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

A Light and Color 249

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Light: The Physical World. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Color: The Perceived World. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

Constraints of Output Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

B Batch Processing Utilities 255

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

Processing Radiosity Solutions Using LSRAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

Ray Tracing Solution Files Using LSRAY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Rendering Files Using LSRENDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

Converting Radiosity Meshes to Textures Using LSM2T . . . . . . . . . . . . . . . . . . . . . . . 267

Converting Solution Files to VRML Files Using LS2VRML . . . . . . . . . . . . . . . . . . . . . 271

Merging Lightscape Files Using LSMERGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

Converting DXF Files to Preparation Files Using DXF2LP. . . . . . . . . . . . . . . . . . . . . . 274

Converting 3DS Files to Preparation Files Using 3DS2LP. . . . . . . . . . . . . . . . . . . . . . . 276

Raytracing Solution Files Using LSRAYF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Deleting Unused Layers and Materials Using LSPURGE . . . . . . . . . . . . . . . . . . . . . . . 281

About Batch Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

Creating Batch Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

C LSnet 287

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

About LSnet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

Using LSnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288

D Reflection Models 301

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Light and Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Reflection Model for Radiosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

Table of Contents

toc

Lightscape

Reflection Model for OpenGL Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

Ray Tracing Reflection Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

E IES Standard File Format 309

F File Types 311

G Common Lamp Values 313

H Viewing Utilities 317

Viewing Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Using LSViewer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Using LVu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320

I References 325

Glossary 327

Index 335

Introduction

An introduction to Lightscape

and lighting technology.

Lightscape™ is an advanced visualization system for generating accurate

lighting simulations of three-dimensional models.

Summary

In this chapter, you learn about:

• Lightscape™

• Computer graphics rendering

• Photometry

• Lightscape documentation

About Lightscape

Lightscape™ is an advanced lighting and visualiza-

tion application used to create accurate images of

how a 3D model of a space, or object, would appear

if physically built. Lightscape uses both radiosity

and ray tracing technology as well as a physically

based interface for defining lights and materials.

Lightscape has many unique advantages over other

rendering technologies, including:

• Realism

• Lighting

• Interactivity

• Progressive refinement.

Realism

Because Lightscape accurately calculates how light

propagates within an environment, you can obtain

subtle but significant lighting effects and produce

images of natural realism not attainable with other

rendering techniques. These effects include indirect

illumination, soft shadowing, and color bleeding

between surfaces.

Physically Based Lighting

Because the technology in Lightscape works with

actual photometric (light energy) values, you can

intuitively set up lights as they would be in the real

world. You can create lighting fixtures with any

distribution and color characteristics or import

Introduction

Lightscape

specific photometric files directly from lighting

manufacturers. You can also specify natural daylight

simply by indicating the location, date, and time of

day.

Interactivity

The result of a radiosity solution is not just a single

image but a full 3D representation of the light distri-

bution in an environment. Because the lighting is

precalculated, Lightscape can display specific views

of a fully rendered model much faster than with

traditional computer graphics techniques. With

faster hardware, it is often possible to move interac-

tively through rendered environments. High-quality

walkthrough animations for film or video can be

generated in a fraction of the time required with

other professional animation systems.

Progressive Refinement

Unlike other techniques, a Lightscape solution

provides instant visual feedback, which continues to

improve in quality over time. At any stage in the

process, you can alter a surface material or lighting

parameter and the system will compensate and

display the results without starting the process over.

The progressive refinement radiosity algorithms

implemented in Lightscape give you precise control

over the quality of visualization required to perform

any given design or production task.

Computer Graphics Rendering

This section provides an overview of computer

graphics rendering and a conceptual understanding

of the techniques available with Lightscape. This

information will help you decide which technique is

most suitable for the visualization task you want to

perform.

A 3D model contains geometric data defined in rela-

tionship to a 3D Cartesian coordinate system. This

system is sometimes referred to as world space. The

model may also contain otherinformation about the

material of each object and the lighting. The image

on a computer monitor is made up of a large number

of illuminated dots called pixels. The task in creating

a computer graphics image of a geometric model is

to determine the color for each pixel on the screen

(screen space) based on the model information and a

specific viewpoint.

The color of any specific point on a surface in a

model is a function of the physical material proper-

ties of that surface and the light that illuminates it.

Two ge n e r a l shading algorithms—local illumination

and global illumination—are used to describe how

surfaces reflect and transmit light.

Local Illumination

Local illumination algorithms describe how indi-

vidual surfaces reflect or transmit light. Given a

description of light arriving at a surface, these math-

ematical algorithms predict the intensity, spectral

character (color), and distribution of the light

leaving that surface. The next task is to determine

where the light arriving at the surface originates. A

simple rendering algorithm considers only the light

coming directly from the light sources themselves in

the shading.

Global Illumination

In considering more accurate images, however, it is

important to take into account not only the light

sources themselves, but also how all the surfaces and

objects in the environment interact with the light.

For example, some surfaces block light, casting

shadows on other surfaces; some surfaces are shiny,

in which case we see in them the reflections of other

surfaces; some surfaces are transparent, in which

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