¡@
2014/10/15 ¤U¤È 10:04:35
iphone Programming Glossary: billboardScaling AR pictures based on the distance from the camera http://stackoverflow.com/questions/11913355/scaling-ar-pictures-based-on-the-distance-from-the-camera assigned to geographical locations when you look at them by the camera. Each such picture may be understood as a billboard which has its geographical position and a heading understood as an angle between its plane and the north direction axis.. and a heading understood as an angle between its plane and the north direction axis . The goal is to make these billboards display more or less like they were physical objects. They should be larger if you are close to them and smaller when farther... the phone I think I screwed my approach. I made an assumption that the maximum view distanse is let ™s say 200 m. Then billboards being 100 m from the phone are displayed in 50 of their original size. That ™s it. A linear scaling based on the maximum..
http://stackoverflow.com/questions/4473894/alternatives-to-creating-an-opengl-texture-from-a-captured-video-frame-to-overla performance penalty. Honestly it really isn't that hard to pull in the video as a texture and then display that as a billboard behind your 3 D overlay. My sample application here does passthrough of camera video to an OpenGL ES 2.0 texture for display..
|