Oripa User Manual
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ORIPA – Origami Pattern Editorv0.34 User’s Manual 1. Overview ORIPA is a drawing software dedicated to designing crease patterns of origami. The unique feature of ORIPA is calculation of the folded shape from the pattern. The first version of ORIPA was released in 2005. 1.1. Main Screen When first initialized, ORIPA’s window must look like the image below: Figure 1. ORIPA main screen. The square showed on the white panel represents the crease pattern. - Black lines represent the edges of the paper or cuts; - Red lines represent mountain folds; - Blue lines represent valley folds; - Grey lines represent auxiliary lines; - Green lines represent selected lines; By default, it is also displayed a grid of grey lines that aren’t part of the crease pattern and are used to aid the input of lines. The menu by the left side of the crease pattern displays input options, display options and the Check Window and Fold buttons. A tip is always displayed by the lower left corner of the window. 2. Line input To input a line, first check the “Input Line” option on the left menu and select one of the three line types below. The types of the lines can be changed afterwards (using the “Alter Line Type” option of the left menu). There are nine ways of creating new lines. To select the input mode click in one of the 9 buttons under the “Command (1…9)” label. 2.1 Line segment To input a line segment while the icon is selected, specify two end points. Holding Ctrl will allow the selection of any point on an existing line. The result will be a line segment connecting the selected points. Figure 2. Example of line segment input 2.2 Line To input a line while the icon is selected, specify two points. Holding Crtl will allow the selection of any point on an existing line. The result will be a line that connects two points of the edge of the paper and contains the selected points. Figure 3. Example of line input 2.3 Perpendicular bisector To input a line while the icon is selected, specify two points. The result will be the perpendicular bisector of the segment delimited by the selected points. This line will connect two point of the edge of the paper. Figure 4. Example of perpendicular bisector input. 2.4 Angle bisector To input a line segment while the icon is selected, first specify three points that delimit the angle to be bisected (the second point will be the vertex of the angle). Then, choose a line to delimit where should the new segment stop. The result will be the angle bisector of the specified angle, starting on the angle vertex and ending on the selected line. Figure 5. Example of angle bisector input. 2.5 Triangle incenter When the icon is selected, specify three points. ORIPA will add three segments to the CP, each of them beginning on one of the selected vertices and ending on the incenter of the triangle delimited by those vertices. Figure 6. Example of input using triangle incenter 2.6 Perpendicular line segment To input a line segment while the icon is selected, specify a point and a line. The result will be a line segment connecting the selected point with its orthogonal projection on the selected line. Figure 7. Example of perpendicular line segment input. 2.7Symmetric line To input a line segment while the icon is selected, specify three points. ORIPA will create a line symmetric to the line that passes through the first and second selected points. The axis of symmetry is the line passing through the second and third selected points. The new line will begin on the second selected point and go until it intersects another existing line of the crease pattern. Holding Ctrl will automatically apply the same function to propagate the new fold until it reaches an edge of the paper. Figure 8. Example of symmetric line input. 2.8 Mirror copy To perform mirror copy, select the icon and pick target line segments by clicking on them. A selected segment will change its color to green even if the mouse cursor isn’t above it. To complete the copy, hold Ctrl and click on a segment with the desired position for the axis. To select segments with a mouse drag movement, see section use the “Select” option in the left menu. Figure 9. Example of mirror copy. 2.9 Input by value To input a segment by value, select the icon and specify the length and angle (in degrees) using the text fields that will appear below the input mode icons. Move the mouse cursor next to a vertex and a preview of the new segment will appear. To complete the input, click on the vertex. Alternatively, you can click on the “Measure” button to get the values of an existing segment. To measure the length of a segment, after clicking on “Measure”, specify two end points. To measure an angle, after clicking on “Measure”, specify three points. Figure 10. Example of input by value. 3. Line copy By using the “Edit” menu in the main screen, you can access three types of copying lines (“Copy and Paste”, “Array Copy” and “Circle Copy”). For all of them, select the target lines first using the “Select” functionality of the left menu. 4. Display options The grid in ORIPA is used to aid the line input by creating virtual vertices on the crease pattern. By unselecting the check box “Show Gird” the grid won’t be displayed. You can also specify the number of divisions for the grid, in the text field “DivNum”, or click on the “x2” and “x1/2” buttons. The number of divisions will always be a natural number greater than 1. The appearance of the mountain/valley creases, auxiliary lines and vertices can be changed by clicking on the respective check box. Figure 11. Part of the left menu showing display options. 5. Folded crease pattern For ORIPA to compute the folded form of the crease pattern, each vertex of the CP must obey the local rules of flat foldability (for more on that, check: T. Hull, On the mathematics of flat origamis. Congressus Numerantium, 100 (1994), pp. 215–224. ) To check if the crease pattern is locally flat foldable, click on the “Check Window” button. Figure 12 shows an example of this window. The problematic vertices are marked with a red square. Figure 12. Example of a check window. Clicking on the “Fold” button will open 2 windows (if there is no problem with the CP): one entitled “Expected Folded Origami” and other entitled “Folded Origami” (if the “Full Estimation ” check box is not selected, only the first one will appear). The “Expected Folded Origami” will show an X-ray of the folded model. You can export .dxf and .obj files using the “File” menu, and, by selecting “Show Cross-Line” in the “Display” menu, a red line will be displayed on this window representing a cut in the origami. The corresponding lines will also be displayed on the CP in purple. You can control the position of the red line with the scroll bars on top and left parts of the window. Figure 13. Example of “Expected Folded Origami” window The “Folded Origami” window displays the full estimation of the folded form (with layer order). Depending on the crease pattern, multiple answers for layer ordering can be found. In that case, you can navigate between these answers using the “Prev” and “Next” buttons. Figure 14. Example of “Folded Origami” window 6. Panning, Zooming and Rotating. The crease pattern main screen, the “Folded Origami” and the “Expected Folded Origami” screens can be panned and zoomed. To pan the content of the window, click using the right button of the mouse and drag it to the desired position. To zoom in, use the scroll wheel of the mouse upwards. To zoom out, scroll downwards. The main screen also supports zooming by holding Ctrl while dragging the mouse with the left click. Additionally, the “Folded Origami” and the “Expected Folded Origami” screens support rotation. To rotate the image clockwise, use the mouse drag to the right while clicking on the left button. To rotate counterclockwise, drag to the left. For more information on the ORIPA algorithm see: http://mitani.cs.tsukuba.ac.jp/dl/eg2008_mitani.pdf
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