# Understanding PerspecitveProjection **URL:** https://forum.kirupa.com/t/understanding-perspecitveprojection/323764 **Category:** flash **Created:** [July 16, 2011, 7:33am UTC](https://forum.kirupa.com/t/understanding-perspecitveprojection/323764 "2011-07-16T07:33:27Z") **Posts on this page:** 1 **Page:** 1
### Author: ![ColinDavies](https://avatars.discourse-cdn.com/v4/letter/c/94ad74/32.png) [@ColinDavies](https://forum.kirupa.com/u/ColinDavies) #### Post date: [July 16, 2011, 7:33am UTC](https://forum.kirupa.com/t/understanding-perspecitveprojection/323764/1 "2011-07-16T07:33:27Z")
## Apoligies In advance if this post appears nonsensical but I’m learning about 3D and havent come to grips with full terminology and concepts yet. ## I am trying to build a 3D world from AS3 2.5D principles. In the world a car navigates though the world. Thus the driver looks out the windscreen at their view of the world. I have decided to try using perspectiveProjection for this. Are these ideas correct for each frame ? The presented view is created with moving the **x y** and **rotation of the map. The projectionCenter** would then be set to a similar Point xy as the position. The f **ocallength** needs to be reset in accordance with the distance of the boundary and or walls/ The \*\*focalWidth \*\*is only used for ‘effect’ in showing speed jumps… ## So far I have been getting both weird and wonderful results, but am unsure how all the perspectiveProjection properties interact. Thus any help welcome.