1. Computer Visualization BIM Curriculum 03

2. Topics  History  Computer Visualization Methods  Visualization Workflow  Technology Background

3. Technology Timeline 19601970198020001990 Gouraud ShadingPhong ShadingBump mappingCommercial 3D CADRay TracingCAD for PC JPEG/MPEG Radiosity Adobe PhotoshopXMLQuickTime / OpenGLVRML „Computer Graphics” term used first Hidden Line AlgorithmFirst Video GameMouse invented http://accad.osu.edu/~waynec/history/timeline.html

4. Visualization Techniques  Photorealistic images (rendering)  Artistic images  Fly through animations  Sun studies  Virtual Reality (VR) NHS office complex by paastudio

5. Standard BIM Visualization Workflow Images Animations VR BIM Model Rendering Engine VR Engine Animation Tool BIM APPLICATION

6. Complex Visualization Workflow Images Animations VR External Rendering Application External VR Application External Animation Application BIM Model BIM APPLICATION External Movie-editing Application External Image-editing Application

7. Photorendering Objective: Creating photorealistic images based on the BIM model using an internal or external rendering engine Process: 1.Modeling 2.Scene layout setup 3.Rendering NHS office complex by paastudio

8. Scene Layout Setup 1.Adjusting the materials  Texture positioning  Color adjustment  Shininess  Bump mapping, transparency 2.Light Settings  General light  Sun light  Brightener lights 3.Placing Cameras  Positioning  Camera angles

9. Computer Shading Techniques Flat Shading Shades each polygon of an object based on the angle between the polygon's surface normal and the direction of the light source Gouraud Shading Simulates the differing effects of light and color across the surface of an object Phong Shading improved version of Gouraud shading that provides a better approximation of light and color http://www.wikipedia.org/

10. Computer Rendering Techniques Ray Tracing is a general technique of studying the path taken by light by following rays of light as they interact with optical surfaces simulate light reflecting only once off each surface Radiosity is a global illumination algorithm that simulate the many reflections of light around a scene, generally resulting in softer, more natural shadows and reflections then Ray Tracing http://www.wikipedia.org/

11. Advanced Rendering Techniques Texture mapping Wrapping a texture image onto a surface to create a realistic representation Bump mapping Similar to texture mapping but the map image adds roughness to the model Depth of Field Objects appear blurry when too far in front of or behind the object in focus http://www.wikipedia.org/

12. Non-photorealistic Renderings Objective: Creating artistic style images based on the BIM model using special rendering engine and/or photo editing software Process A: 1.Modeling 2.Scene layout setup 3.Non-Photorealistic Rendering Process B: 1.Modeling 2.Scene layout setup 3.Photorealistic Rendering 4.Modifying the image in a photo-editing software NHS office complex by paastudio

13. Non-photorealistic Renderings Images were made with Piranesi software from InformatixInformatix Artistic rendering applications support various painting styles:  Pencil  Ink  Ball-Pen  Water-colour  Oil-colours

14. Fly Through Animations Objective: Creating movies of the building along a predefined camera path, based on the BIM model, using internal or external animation tools Workflow 1.Modeling 2.Scene layout setup 3.Defining camera path 4.Movie calculation

15. Animation Basics  Animation is the optical illusion of motion created by the consecutive display of images of static elements.  In computer animations each frame of the movie is produced individually by a computer software.  When the frames are strung together there is an illusion of continuous movement  Typical Frame rates are 12-25 frames per second http://www.wikipedia.org/

16. Sun Studies The sun study is a special type of computer animation. The objective of making sun studies is to visualize the natural lighting conditions on a given location of the building at a particular day of the year. Unlike in fly through animations the camera position is fixed while the sun location is continuously changing Workflow 1.Modeling 2.Scene layout setup 3.Day settings 4.Sun study calculation

17. Virtual Reality (VR)  Virtual Reality (VR) is an environment that is simulated by a computer.  Most virtual reality environments are primarily for visual purposes  VR-s provide more freedom for the users in exploring the building then pre-recorded animations Workflow 1.Modeling 2.Scene layout setup 3.VR camera settings 4.VR calculation

18. QuickTime VR QuickTime VR is a type of interactive movie supported by Apple's QuickTime file format. QTVRs can be "stitched" together from several normal photographs, or captured with specialized panoramic cameras, or rendered from 3D-modelled scenes. There are two types of QuickTime VR-s: QuickTime VR (QTVR) Panoramas are panoramic images which surround the viewer with an environment (inside, looking out), providing a sense of place. QuickTime VR (QTVR) Objects are captured from many locations pointing in toward the same central object.