A 3D photo-montage is a photograph combined with 3D CGI elements which blend seamlessly together. Photo-montages are usually produced to visualise buildings or structures which are under construction or are still at the planning stage. To create an image like this you need a 3D package, for example 3DS Max or Cinema 4D, and also a photo editing package like 'photoshop'. A photograph of the scene, plans of the proposed structure and a survey of the area for ground levels.
First of all you need to examine to detail the original photograph. You need to decide which elements of the picture need modeled and to how much detail. Some sections of the photo can be left out if very little to none needs modeled. Thinking about reflection and light in the photo is another element of the picture you need to examine.
Beginning the modeling stage keep working to a scale of 1:1, this is so the light reacts to the scene as real looking as possible. When you import all the views of the building into the 3D package set them to scale. The procedure I tend to use is to make a parametric box and give it a length consistent with a large distance in the scene. Take for example the length of the entire building and then measure the relative height to match.
While modeling keep in mind to model the surrounding features such as house eves, lampposts to the accurate scale and level. This will cause less problems when it comes to the camera matching stage.
When you have modeled the scene, upload the original photograph into a selected 3D Visualisation package as it is to be used as a background and the create a camera. The camera needs to be positioned as close as possible to get a match to the scene. A good tip when your doing this is to draw a spline around the site, making sure it's at the correct level, in the 3D package and hide any elements except the surrounding elements and the spline. To adjust the settings on the virtual camera 35mm is a good lens to start with but if you know the size of the lens that was used to take the photograph then use them settings. You need adjust the virtual camera until everything matches up. the focal length may also need to be adjusted but this is usually if the the camera isn't lining up. When everything looks good and you happy enough unhide the geometry used for the montage and then hide everything else. Lighting the scene comes next, do this as closely as possible to the picture. By studying the direction and height of the sun you can match the virtual lights accordingly.
Once all these stages are complete you need to render the scene with an 'alpha channel' but dont include the photograph as a background. Open the render and photograph in photoshop and layer them up... blend the exposure and cut out any elements in the foreground eg trees etc so the CGI element glues as much as possible to the photograph.
First of all you need to examine to detail the original photograph. You need to decide which elements of the picture need modeled and to how much detail. Some sections of the photo can be left out if very little to none needs modeled. Thinking about reflection and light in the photo is another element of the picture you need to examine.
Beginning the modeling stage keep working to a scale of 1:1, this is so the light reacts to the scene as real looking as possible. When you import all the views of the building into the 3D package set them to scale. The procedure I tend to use is to make a parametric box and give it a length consistent with a large distance in the scene. Take for example the length of the entire building and then measure the relative height to match.
While modeling keep in mind to model the surrounding features such as house eves, lampposts to the accurate scale and level. This will cause less problems when it comes to the camera matching stage.
When you have modeled the scene, upload the original photograph into a selected 3D Visualisation package as it is to be used as a background and the create a camera. The camera needs to be positioned as close as possible to get a match to the scene. A good tip when your doing this is to draw a spline around the site, making sure it's at the correct level, in the 3D package and hide any elements except the surrounding elements and the spline. To adjust the settings on the virtual camera 35mm is a good lens to start with but if you know the size of the lens that was used to take the photograph then use them settings. You need adjust the virtual camera until everything matches up. the focal length may also need to be adjusted but this is usually if the the camera isn't lining up. When everything looks good and you happy enough unhide the geometry used for the montage and then hide everything else. Lighting the scene comes next, do this as closely as possible to the picture. By studying the direction and height of the sun you can match the virtual lights accordingly.
Once all these stages are complete you need to render the scene with an 'alpha channel' but dont include the photograph as a background. Open the render and photograph in photoshop and layer them up... blend the exposure and cut out any elements in the foreground eg trees etc so the CGI element glues as much as possible to the photograph.
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