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Set Up the Projection Camera
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The most important part of this entire process is making sure that the camera that projects the texture is set up as accurately as possible The camera projecting the image should use the same focal length and aspect ratio as the camera that took the original photograph For this reason, it is helpful to know the focal length of the lens that was used to take the photograph When you have the focal length data, you can be sure that once you have aligned one object between the camera and the photo, the rest of the geometry will fall into place Without this information, you could guess the focal length, but it would take much trial and error to set up the scene properly Without establishing how the lens distorts parallel lines, you might find that after you place one object, matching the next one is more of a challenge it may need to be moved farther away or scaled bigger or smaller than it should be in relation to the objects in the scene If this is the case, you know that you need to try a different focal length Even if you can line up the object with the photograph by scaling or moving it away, once you begin animating the camera, the image will quickly fall apart
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To make this setup easier, the photo was shot so that the center cross hairs
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in the camera matched the point where the brick wall meets the ground This ensured that the camera was pointed at an object on the ground When the camera is orbited later on, it will rotate around that point, and since it is known that the X axis lies on the ground, we can place other objects relative to it This is information you may not have if you are using a stock photo, but take note of these things if you are shooting your own photograph It will make alignment in Maya much easier Let s begin the setup:
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Set up a new Maya project and start a new scene You may wish to copy the mcr8_ch27_junkyard_refiff and mcr8_ch27_junkyard_HRiff images to the source images directory of the new project Create a new camera (Create | Cameras | Camera) and name it projectionCam Move it back along the Z axis and use the Show Manipulator tool to snap the camera s reference point to the world origin When viewing the scene through this camera, having the camera pointing at this world origin will put the X axis along the centerline of the photograph In the projectionCam camera s attributes, set the focal length to 52, since the photograph was taken with a 52mm lens In the Render Settings window, set the resolution to match the resolution of the photo In this case, it is 1079 719
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Rendering for Postproduction
Look through the projectionCam camera and create an image plane for that camera by choosing View | Image Plane | Image Plane Attributes In the Attribute Editor, load mcr8_ ch27_junkyard_refiff in the Image attribute Click the Fit to Resolution Gate button You may need to adjust the camera s Overscan attribute so that
the entire image plane is visible Our image is now set to project from a camera with the same focal length and aspect ratio as the original photograph We now need to position this camera so that its height and orientation with respect to the ground match the position and orientation of the original camera We will use the large bin on the left side of the photo to calibrate this
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Switch to a Side view and create a polygonal cube that is 2 2 2 Edit its pivot point to the base of the object, and then move the cube so that it sits on the XZ plane Turn on snapping to make sure that the polygonal cube is sitting on the axis Switch the view though the projectionCam camera Orbit the camera up and try to align the grid lines with the base line of the left bin As long as you don t move the camera with the pan control, that center X axis will always be on the ground Once the grid lines are aligned with the base of the bin, we can use the cube to determine the distance, or how far back the camera needs to be from the center Zoom out so that the edge of the grid is visible in the foreground Use the Move tool to move the cube over in X about 5 units and in Z about 5 units until the lower corner lines up with the photograph The cube should actually sit right below the bottom edges of the bin, since the bin seems to be sitting a few inches off the ground You may need to tweak the camera by orbiting or nudging the cube in the X or Z axis Just be sure not to pan the camera or move the cube in the Y axis Scale the cube in Y until the top edge aligns with the top edge of the left bin in the photograph Do any final bits of tweaking to get both the upper edge and the lower edge in alignment When those edges are matched, the cube can be scaled along its Z axis and translated in Z until the front and rear edges are aligned It may be best to select the attribute in the Channel Box and MMB-drag
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