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For the railing, I used the rendered alpha channel and used it as the mask for this layer. Notice how the painting can be very loose and indistinct and yet with the clean edges of the mask and the 3D render underneath, it looks okay. Depending on the complexity of the model and its overlapping areas, several alpha channels may have to be rendered. But this will be enough and the other details can be added on separate layers.
Whenever possible, try to use vector shape layers to keep clean edges and maximize editability. For the framework around the screens, start with the Rectangle tool. Make sure the Shape Layers option is chosen at the upper left of the Options top bar. After making the rectangle, hold down the ALT/OPT key to subtract from the current shape and put holes in the rectangle, making it look like a frame with crossbars. Use the Path Selection tool (the black arrow) to select all the separate shapes on the one shape layer. Now you can copy and paste these shapes or just ALT/OPT+drag them to make a copy. Notice that with the Path Selection tool active and paths selected, some very helpful options become available. A number of Align and Distribute buttons can be used to make sure the shapes are evenly spaced out. Click the large Combine button to combine all the separate shapes into one path on the shape layer.
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Now that the paths are all one and the unfilled areas hanging out below are gone, it is easy to transform the frame. Create some lines on an upper layer to serve as perspective guide lines. Follow the angles of the 3D geometry. Use Distort and Skew to match the edges to the perspective lines. Then add some Bevel & Emboss and Inner Shadow layer styles to give it some dimension. A layer clipped to it is used for some quick scribbles to add hints of dirt and rust. The shape on the screen layer was filled a fence pattern, then scaled down and transformed to match the frame. A Color Overlay adjusted the color and a Stroke thickened it up a bit.
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