How to Cut a 3D Model into Pieces

Cutting a model is a common and important operation in 3D modeling, whether for creating complex animations or preparing a model for 3D printing. Blender, a powerful 3D modeling tool, provides several methods to achieve model cutting. This article will detail how to cut a 3D model into pieces in Blender and share some practical tips for its application.

　　Choosing the Right Tool

　　Blender offers several commonly used methods for cutting 3D models:

　　- Knife Tool: Allows you to freely draw cutting lines for precise cuts.

　　- Boolean Modifier: Uses another object as a cutting tool to perform complex cuts.

　　- Bisect Tool: Quickly cuts the model along a specific plane into two parts.

　　Using the Knife Tool for Cutting

　　The Knife Tool is an intuitive and flexible cutting tool in Blender, suitable for various cutting needs. Here are the specific steps for using the Knife Tool:

　　1. Select the Model: Open Blender and load your 3D model. Enter Edit Mode (toggle with the Tab key).

　　2. Activate the Knife Tool: Select the Knife Tool from the left toolbar or press the K key on your keyboard.

　　3. Draw the Cutting Line: Click with the left mouse button on the model to start drawing the cutting line. Continue clicking along the path you want to cut, and press Enter to complete the cut.

　　4. Separate the Parts: After cutting, select the part you want to separate (press L to select linked parts), then press P and choose "Selection" to separate it into an independent object.

　　Using the Boolean Modifier for Cutting

　　The Boolean Modifier is suitable for complex cutting needs and allows flexible operations by using another object as a cutting tool. Here are the specific steps:

　　1. Create a Cutting Tool: In Blender, create an auxiliary object for cutting, such as a cube or cylinder. Adjust its position and size to cover the part you want to cut.

　　2. Add a Boolean Modifier: Select the model you want to cut, go to the Modifier panel, and add a Boolean Modifier.

　　3. Set the Boolean Operation: In the Boolean Modifier, select the cutting tool object and set the operation type to "Difference," then click "Apply" to apply the modifier.

　　4. Remove the Cutting Tool: After completing the cut, you can delete or hide the cutting tool object.

　　Using the Bisect Tool for Cutting

　　The Bisect Tool is a quick way to cut a model along a specific plane, suitable for simple straight cuts. Here are the specific steps:

　　1. Select the Model: Open Blender and load your 3D model. Enter Edit Mode.

　　2. Activate the Bisect Tool: Select the Bisect Tool from the left toolbar or press Shift+Space and then choose Bisect.

　　3. Draw the Cutting Plane: Click and drag the mouse on the model to draw the cutting plane. You can adjust the angle and position of the cutting plane in the tool settings.

　　4. Apply the Cut: After drawing the cutting plane, the model will be divided into two parts. You can further process each part as needed.

　　Practical Tips for Cutting

　　- Model Optimization: Before cutting a model, ensure that the topology is clean. Removing unnecessary vertices and edges can prevent unwanted geometric issues after cutting.

　　- Using the Mirror Modifier: If the model is symmetrical, use the Mirror Modifier to simplify the cutting process. Cut one half of the model, then apply the Mirror Modifier to get a complete cut.

　　- Merging After Cutting: After cutting and modifying the model, you may need to merge multiple parts into a whole. Select all parts, enter Edit Mode, press M, and choose "By Distance" to remove duplicate vertices.

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　　By following the above methods and tips, you can easily cut a 3D model into multiple parts in Blender and further process and optimize them. I hope this article helps you better master Blender's cutting tools, enabling you to create more complex and refined 3D works.