A 3D Photo-Montage is simply a photograph merged seamlessly together with a 3D CGI element. 3D Photo-Montages are particularly used in construction and development, to show what an area will look like once a structure is built or changes to an existing building occur. To produce this image you will need a 3D and photo editing package for your computer. You will also need the proposed plans of the building, a survey of the area and all importantly a photo of the scene.
Before starting work on the montage you will need to take time to study the photograph in great detail. By doing this you can decide on which sections of the photo you will spend great detail modeling. Small details that cannot really be seen can be left as they are or very little modeling applied. You also need to consider the area where reflection occur. You need to decide if they would be visible to the camera and if they are worth modeling in great detail.
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.
When your modeling remember that the surrounding elements like the lampposts and eves of houses have to be modeled to the correct scale and level. This saves any complications at the camera matching stage.
After you have modeled the scene you now have to import the photograph into a 3D Visualisation package. The picture is used as the background and you will need to create a virtual camera. The camera should be positioned as close as possible to ensure it matches the scene. A great tip to make sure you do this right, is to draw a spline around the site (correct level) in the 3D package and hide any elements apart from the surrounding ones and the spline. To adjust the settings of the virtual camera use the lens that was used to take the original photo, but if you don't know them starting at 35mm is good. Adjusting the camera to make sure everything lines up may not always work and you might have to adjust the focal length setting but this will not always be the case. When everything looks positioned correctly you need to unhide all of the geometry that was needed for the montage but then hide everything else. Study the height and direction of the sun before lighting the scene. Match the direction to the virtual lights.
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 starting work on the montage you will need to take time to study the photograph in great detail. By doing this you can decide on which sections of the photo you will spend great detail modeling. Small details that cannot really be seen can be left as they are or very little modeling applied. You also need to consider the area where reflection occur. You need to decide if they would be visible to the camera and if they are worth modeling in great detail.
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.
When your modeling remember that the surrounding elements like the lampposts and eves of houses have to be modeled to the correct scale and level. This saves any complications at the camera matching stage.
After you have modeled the scene you now have to import the photograph into a 3D Visualisation package. The picture is used as the background and you will need to create a virtual camera. The camera should be positioned as close as possible to ensure it matches the scene. A great tip to make sure you do this right, is to draw a spline around the site (correct level) in the 3D package and hide any elements apart from the surrounding ones and the spline. To adjust the settings of the virtual camera use the lens that was used to take the original photo, but if you don't know them starting at 35mm is good. Adjusting the camera to make sure everything lines up may not always work and you might have to adjust the focal length setting but this will not always be the case. When everything looks positioned correctly you need to unhide all of the geometry that was needed for the montage but then hide everything else. Study the height and direction of the sun before lighting the scene. Match the direction to the virtual lights.
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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