Sign & Digital Graphics

April '19

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36 • April 2019 • S I G N & D I G I T A L G R A P H I C S DIGITAL PRINTING AND FINISHING DIGITAL GRAPHICS Photographs You can also generate 3D models from photographs or entirely from scratch. In this instance I'll demonstrate how to create a simple 3D object from a photograph and prepare it for output to a 3D printer. Here is a picture of a chess piece (a queen) against a plain background. The camera was positioned at a reasonable distance to minimize distortion. Then the picture is opened in Photoshop. (Figure 5). The right half of the image is selected and copied to a new layer (Layer > New > Layer Via Copy) (Figure 6). If the area has undercuts, they need to be refined to smooth them out, because they can confuse a desktop printer. From the 3 D panel found in the Window menu, Selected Layer is cho- sen as the Source, and 3D Extrusion as the method. Click the Create button to transform the layer into a 3D layer. Initially, the 3D object is extruded with the shape of the queen on the face of the extrusion. With the camera view active, it's a good idea to drag the workspace around to view the extruded object from differ- ent angles. (Figure 7) Do not move the object itself. Shifting it off its base will distort it when it is reshaped. Open the Properties panel and select the second icon at the top to switch to the Deform settings. Set the Extrusion Depth field to zero. (Figure 8) The queen loses its extrusion depth. This next step functions like a digital lathe. In the lower field of the Properties panel, click the Bend button. Drag the Horizontal Angle slider to 360 degrees. The object revolves around its center producing a cylinder. (Figure 9a and 9b) At the top of the properties panel there is an icon consisting of nine little squares. Click the center left square to revolve the queen's the left edge. Voila! A 3 D replication of the object that we photographed is generated. (Figure 10a and 10b) Before outputting the object, check to see that it is sitting flat on the ground Figure 5: The photo of the original chess piece. Figure 6: Select the right half of the image with the selec- tion tools and copy the selec- tion to a new layer. Figure 7: Drag the work- space around to view the object from different angles. Figure 8: When the Extrusion Depth field is set to zero, the queen loses its extrusion depth. Figures 9a and 9b: Drag the Horizontal Angle slider to 360 degrees to revolve the queen around its center to a cylinder. Figures 10a and 10b: Click the center left square to revolve the queen's left edge to produce a 3D replication of the object that we photographed. Figure 11: Make sure the X, Y, and Z angles are all set to zero.

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