A 3D Photo-Montage is a photograph merged together with a 3D CGI components that combine together seamlessly. 3D Photo-Montages are usually created to show the finished result of a building or development under construction or even before building has started. To be able to create such a montage you will need a 3D software package for your computer (3DS Max or Cinema 4D) and you will need a photo editing packages such as Photoshop. The plans for the submitted building, survey of the area for ground levels and of course a photograph of the scene as it is.
Before beginning you need to examine the photograph and consider which elements need modelled and which don't, anything which isn't directly visible in the scene can be left out (or modelled with minimum detail), but when considering this you need to also think about reflections in glass etc. and whether the parts not visible to camera will actually be mirrored on reflective surfaces and whether it is worth modelling detail into them or not.
When starting the modeling stage it is beneficial to work at a scale of 1:1. This will ensure that the lighting reacts to the original scene as life like as possible. Set the scale when you have imported all the views of the structure into the 3D Package. I find it handy to create a parametric box and give its length according to the largest distance in the scene. E.g take the length of the entire building and then scale the corresponding 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.
When you've finished these stages and your happy, it's time to render the scene. Do this with 'Alpha Channel' but remember not to include the photograph as a background. By opening the render and photo in Photoshop you can layer them and blend the exposure and cut any elements that are in the foreground. This is to ensure the CGI element glues everything to the photograph.
Before beginning you need to examine the photograph and consider which elements need modelled and which don't, anything which isn't directly visible in the scene can be left out (or modelled with minimum detail), but when considering this you need to also think about reflections in glass etc. and whether the parts not visible to camera will actually be mirrored on reflective surfaces and whether it is worth modelling detail into them or not.
When starting the modeling stage it is beneficial to work at a scale of 1:1. This will ensure that the lighting reacts to the original scene as life like as possible. Set the scale when you have imported all the views of the structure into the 3D Package. I find it handy to create a parametric box and give its length according to the largest distance in the scene. E.g take the length of the entire building and then scale the corresponding 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.
When you've finished these stages and your happy, it's time to render the scene. Do this with 'Alpha Channel' but remember not to include the photograph as a background. By opening the render and photo in Photoshop you can layer them and blend the exposure and cut any elements that are in the foreground. This is to ensure the CGI element glues everything to the photograph.
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