Difference between revisions of "Tutorial/Blender to CAD"

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1. Open Blender <br> [[Image:Blender Step 1.jpg|center|thumb|1000px|Blender Startup Screen]]
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2.Use the scale manipulator to flatten and expand the cube so it looks like a tabletop. <br> [[Image:Blender Step 2.jpg|center|thumb|1000px|Tabletop]]
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3.Go to the Add menu or use the shortcut Shift+A. Add a cube. <br> [[Image:Blender Step 3.jpg|center|thumb|1000px|Table Leg cube]]
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4.Use the scale manipulator to expand and flatten this cube so it looks like a table leg. Then duplicate this table leg 3 times. <br> [[Image:Blender Step 4.jpg|center|thumb|1000px|Table Legs]]
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5.Move the legs of the table so it represents a table. <br> [[Image:Blender Step 5.jpg|center|thumb|1000px|Position Table Legs]]
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6.Select all the legs and the tabletop, and then click joins on the left side of the window under Object. <br> [[Image:Blender Step 6.jpg|center|thumb|1000px|Join Legs To Tabletop]]
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7.Go to File on the top left corner and select export. Under the export select obj. <br> [[Image:Blender Step 7.jpg|center|thumb|1000px|Export Table]]
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8.You will get an export window. Name your file test (optional).
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9.Once you have named your file click on the Export OBJ button, which can be found in the top right corner, to export your blender file. <br> [[Image:Blender Step 9.jpg|center|thumb|1000px|Export To OBJ]]
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10.Go to the BRL-CAD bin directory and give the command to turn you obj file into a .g file. This command exports the obj-formatted file to a .g file. The syntax of the obj-g command is
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>obj-g input.obj output.g 
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Don’t forget to enter a path for your files. To see all the uses of the obj-g command just enter “obj-g.” 
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11.Open mged. You will see two windows, a command window that is white and a graphics window that is black. <br>
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{| border="0"
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|-
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|[[Image:MGED 7.22 Step 11.jpg|center|thumb|500px|Command Window]]||[[Image:MGED 7.22 Graphics Step 11.jpg|center|thumb|550px|Graphics Window]]
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|}
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12.Select File and click open. Open you .g file that you just made. <br> [[Image:MGED 7.22.0 Command Window Step 12.jpg|center|thumb|1000px|Open .g File]]
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13.Then click on Tools. Open Geometry Browser under tools. Double click on the top object to display it. <br> [[Image:MGED 7.22.0 Command Window Step 13.jpg|center|thumb|1000px|Click on Tools]]<br><br> [[Image:Geometry Browser Step 13.jpg|center|thumb|1000px|Geometry Browser]]
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14.Click on View. Select “az35,el25” <br> [[Image:MGED 7.22.0 Command Window Step 14.jpg|center|thumb|1000px|Change view]]
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15.Click on Tools once again. Select the Raytrace Control Panel. Hit the raytrace button. <br> [[Image:MGED_7.22.0_Command_Window_Step_15_-1.jpg|center|thumb|1000px|Raytrace]]<br><br> [[Image:Raytrace_Control_Panel_Step_15_and_16_-4.jpg|center|thumb|1000px|Raytrace Control Panel]]<br><br> [[Image:MGED_7.22_Step_15_-2.jpg|center|thumb|1000px|Command Window Raytrace Complete]]
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Once you have Raytraced, you should have an image the looks like this:<br>[[Image:MGED 7.22 Step 15.jpg|center|thumb|1000px|Graphics Window Raytrace Complete]] 
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16.Do you remember what the table looked like when we were done with it in Blender? It was upside down and now it’s on its side. Rotating the table reorients it correct way. To reorient your table the right way, enter these commands in the command window:
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  sed default.1.1.b.c.s <br>
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{| border="0"
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|-
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|[[Image:MGED_7.22_Step_16_-1.jpg|center|thumb|800px|Command Window First command]]||[[Image:Fullscreen_capture_Step_16_-1.jpg|center|thumb|575px|Graphics Window First command]]
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|}
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  rot –90 0 0 <br>
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{| border="0"
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|-
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|[[Image:Fullscreen_capture_Step_16_-2.jpg|center|thumb|800px|Commands Window Second Command]]||[[Image:Fullscreen_capture_Step_16_-2_-2.jpg|center|thumb|450px|Graphics Window Seccond command]]
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|}
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  accept <br>
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{| border="0"
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|-
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|[[Image:Fullscreen_capture_Step_16_-3.jpg|center|thumb|800px|Commands Window Third Command]]||[[Image:MGED_7.22_Step_16_-3.jpg|center|thumb|450px|Graphics Window Third command]]
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|}
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Then Raytrace the table once again by going to the Tools menu. <br>[[Image:Raytrace_Control_Panel_Step_15_and_16_-4.jpg|center|thumb|1000px|Raytrace Again]]
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With that final rendering your import is complete! <br>[[Image:MGED_7.22.0_Graphics_Window_Step_16_-5.jpg|center|thumb|500px|Complete]]
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[[Image:Xyz.jpg|center|thumb|500px|BRL-CAD, like most of the CAD industry, uses +Z for up.  Blender, like most of the film industry, uses +Y for up. Using +Y for up has origins in the film industry where the image screen is the center of attention, X and Y form a view plane and Z is the depth or distance from the camera. Using +Z for up has origins in manufacturing and architecture where the object and scene are the center of attention,  X and Y form a horizontal ground plane, and thus Z becomes the elevation or height dimension.]]
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Revision as of 07:39, 6 May 2013

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