Now repeat that Cmd/Ctrl-drag move 4 more times to create the planes that cover the cushion nearest the camera: first a vertical one to cover the hidden front of the cushion, then a horizontal one covering the sitting area, then two more vertical ones to cover the sides facing the camera.įinally, extend the first plane to cover the sitting surface of the inside corner cushion. While holding down Command (Mac) or Control (Windows), drag downward from the resizing box on the front edge of that plane to drop a new vertical plane down over the front edge of those far cushions. A blue grid doesn't guarantee that it's correct for your scene, however, just that it could be correct. You want to see a blue grid, not yellow or red. Photoshop will help you with this: the grid inside the plane changes color to indicate how plausible the plane is. You need to be fairly accurate about how you establish this plane, since any errors here will propagate to the rest of the 3D model. Using the Create Plane tool, draw a box around the sitting surface of the two fully-visible cushions. Open your photo in Photoshop, then say Filter → Vanishing Point. Additionally, you should use a lens supported by the lens correction feature of Lightroom or ACR, then use that automatic correction on your photo before attempting to construct a 3D model from it. The DxO lens database can help you select one. The best way to achieve a rectilinear photograph is to use a low-distortion lens to take the picture. You can manually edit the geometry Photoshop creates to make an inaccurate model to match your inaccurate photo, but that's an avoidable hassle. Distortion makes it impossible for Photoshop to create 3D geometry that aligns accurately with features in the photo. This technique works best with a rectilinear photo, meaning one without any distortion. There is an alternate path for those using a version of Photoshop that lacks the 3D features, which I will cover inline below.
It's easiest to use a 3D-capable version of Photoshop,¹ which I presume you have, since you haven't mentioned any other 3D software. You can use Photoshop's Vanishing Point filter for this.
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