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How to Cut an Object Using Knife Project in Blender 2.77

If you're using Blender 2.77, there are two options for cutting objects with the Knife Project Tool. You can cut an object with or without cutting through it. Either way, it isn't hard to do. Add a new cube by pressing  » Mesh » Cube.
Part 1 of 2:

Setting Up the Object

  1. How to Cut an Object Using Knife Project in Blender 2.77 Picture 1How to Cut an Object Using Knife Project in Blender 2.77 Picture 1
    Add a new cube by pressing ⇧ Shift+A » Mesh » Cube.
  2. How to Cut an Object Using Knife Project in Blender 2.77 Picture 2How to Cut an Object Using Knife Project in Blender 2.77 Picture 2
    Continue to add a new circle by pressing ⇧ Shift+A  » Mesh » Circle.
  3. How to Cut an Object Using Knife Project in Blender 2.77 Picture 3How to Cut an Object Using Knife Project in Blender 2.77 Picture 3
    Press the R key, hit the X key and type 90 to rotate the circle 90 degrees around the x-axis.
  4. How to Cut an Object Using Knife Project in Blender 2.77 Picture 4How to Cut an Object Using Knife Project in Blender 2.77 Picture 4
    Switch from the Perspective View Mode (persp) to the Orthographic View Mode (ortho). You can do this by pressing the Numpad 5 key.
  5. How to Cut an Object Using Knife Project in Blender 2.77 Picture 5How to Cut an Object Using Knife Project in Blender 2.77 Picture 5
    Press the Numpad 1 key to view from the front of the cube.
  6. How to Cut an Object Using Knife Project in Blender 2.77 Picture 6How to Cut an Object Using Knife Project in Blender 2.77 Picture 6
    Press G to move the circle to the center of the cube. Then press S to scale the circle.
  7. How to Cut an Object Using Knife Project in Blender 2.77 Picture 7How to Cut an Object Using Knife Project in Blender 2.77 Picture 7
    Press A to deselect all visible objects in scene. Hold down the ⇧ and right click on the circle first. Then right click on the cube.
  8. How to Cut an Object Using Knife Project in Blender 2.77 Picture 8How to Cut an Object Using Knife Project in Blender 2.77 Picture 8
    Switch from Object Mode to Edit Mode by pressing Tab ↹. In the Tool Shelf panel, select Tool » Knife Project. Press T to open the Tool Shelf panel if you don't see it.

=== Making the Cut ===

How to Cut an Object Using Knife Project in Blender 2.77 Picture 9How to Cut an Object Using Knife Project in Blender 2.77 Picture 9

Method 1: Using Cut-Through

  1. How to Cut an Object Using Knife Project in Blender 2.77 Picture 10How to Cut an Object Using Knife Project in Blender 2.77 Picture 10
    Select the Cut through option in Knife Project. This will cut both two sides of the cube.
  2. How to Cut an Object Using Knife Project in Blender 2.77 Picture 11How to Cut an Object Using Knife Project in Blender 2.77 Picture 11
    Press the Delete key » Faces to cut holes in the cube.
Part 2 of 2:

Method 2: Using the Cut Through Tool

  1. How to Cut an Object Using Knife Project in Blender 2.77 Picture 12How to Cut an Object Using Knife Project in Blender 2.77 Picture 12
    Deselect the Cut through option. You will cut only one side of the cube – the front of the cube.
  2. How to Cut an Object Using Knife Project in Blender 2.77 Picture 13How to Cut an Object Using Knife Project in Blender 2.77 Picture 13
    Press the Delete key » Faces to cut a hole in the front of the cube.
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