1 / 18

Specifying an Arbitrary 3D View

Specifying an Arbitrary 3D View. Creation of a 3D View. Mapping a 3D view onto a 2D screen requires:. specifying a projection model. specifying viewing parameters. specifying viewing parameters. 3d clipping. projection and display. Creation of a 3D View.

aiko-stark
Download Presentation

Specifying an Arbitrary 3D View

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Specifying an Arbitrary 3D View

  2. Creation of a 3D View Mapping a 3D view onto a 2D screen requires: • specifying a projection model • specifying viewing parameters • specifying viewing parameters • 3d clipping • projection and display

  3. Creation of a 3D View View Reference Point (VRP) - a point on the view plane View Plane Normal (VPN) - a vector normal to the view plane View-Up Vector (VUP) - defines the v axis direction. (indicates which way is up.)

  4. v PROJECTION PLANE VIEW PLANE View Reference Point VUP VRP View-Up Vector VPN u View Plane Normal n Creation of a 3D View

  5. Creation of a 3D View Coordinate Systems: Viewing Reference Coordinate System World Coordinate System

  6. Creation of a 3D View Viewing Reference Coordinate Systemorigin - the VRPn axis - the VPNv axis - coincident with the projection of the VUP onto the view planeu axis - perpendicular to n and v axes, and defined such that u, v, and n form a right-handed coordinate system.

  7. y y v y y y y VIEW PLANE Viewing Reference (Camera) Coordinate System y v z z x x z z u x x z z z n u x World (Object) Coordinate System x n x Creation of a 3D View

  8. v VIEW PLANE (Umax,Vmax) VRP (Umin,Vmin) VPN u n CW Creation of a 3D View

  9. Creation of a 3D View Viewing Reference Coordinate SystemThe center and direction of projection are defined by : - a projection reference point PRP - the projection type (perspective/parallel)

  10. v VIEW PLANE VRP VPN u n PRP CW Projection Reference Point - defines direction of projection Creation of a 3D View: parallel

  11. v VIEW PLANE VRP VPN u n PRP Projection Reference Point = center of projection Creation of a 3D View: perspective

  12. Creation of a 3D View Mapping a 3D view onto a 2D screen requires: • specifying a projection model • specifying viewing parameters • 3D clipping • 3D clipping • projection and display

  13. Creation of a 3D View View Volume:defines thebounds of the world coordinate system that is to be clipped and projected onto the view plane.

  14. v VIEW PLANE VRP VPN u n PRP CW Projection Reference Point - defines direction of projection Creation of a 3D View: parallel

  15. BACK CLIPPING PLANE v VIEW PLANE FRONT CLIPPING PLANE VRP VPN u n CW Creation of a 3D View: parallel

  16. v VIEW PLANE VRP VPN u n PRP Projection Reference Point = center of projection Creation of a 3D View: perspective

  17. BACK CLIPPING PLANE v VIEW PLANE FRONT CLIPPING PLANE VRP VPN u n PRP Creation of a 3D View: perspective

  18. Creation of a 3D View 3D Clipping for the parallel view volume:extension of the 2D Cohen-Sutherland clipping algorithm 6 bit outcodes: 100000 point is above view volume y > 1 010000 point is below view volume y < -1 001000 point is right of view volume x > 1 000100 point is left of view volume x < -1 000010 point is behind view volume z < -1 000001 point is in front of view volume z > 1

More Related