This is an example of 2 camera mapping technics but using very few time to do. The bump textures are realized with Gimp and Insane Bump addon.
In the first case, it is better to have a bump map but you don't need to do a complex mapping (only one vertical and horizontal plane), and just a simple projection is enought.
For the 2 case (under water), complex mapping is not required as well, but you just need to do some few approximate manual displacement on the plane where you think the objects are (use sculture and push a bit where it is needed).
Result is not perfect but the time spent is very fast.
If you want to see more quick tutorials, please consult my channel here: / freelandertrail
En esta página del sitio puede ver el video en línea Blender easy Camera Mapping for beginners (Quick Tutorial) de Duración hora minuto segunda en buena calidad , que subió el usuario FreelanderTrail 05 julio 2014, comparta el enlace con amigos y conocidos, en youtube este video ya ha sido visto 1,602 veces y le gustó 11 a los espectadores. Disfruta viendo!