How to Cut a 3D Model in Blender

Blender is a powerful 3D modeling software widely used in animation, game development, and visual effects. Cutting models is a common and essential operation in 3D modeling. This article provides a detailed guide on how to cut a 3D model in Blender, with a seamless integration of recommendations for Relebook's resource download platform.

　　Using Knife Tool for Cutting

　　Blender offers various cutting tools, with the Knife tool being the most commonly used for precise cuts on the model's surface.

　　Enabling Knife Tool

　　First, select the object you want to cut and enter Edit Mode. From the top menu bar, choose "Mesh" > "Knife Tool". Alternatively, you can directly press the K key to enable the Knife tool.

　　Performing the Cut

　　Once the Knife tool is enabled, click to start cutting at the desired point on the model's surface, then move the mouse to the endpoint and click again. Continue adding more cut points by clicking and press Enter to complete the cut operation. Press Esc if you need to cancel the cut.

　　Using Boolean Modifier for Cutting

　　The Boolean modifier is another commonly used tool for complex cutting operations, allowing you to cut models based on intersections, differences, or unions with another object.

　　Adding Boolean Modifier

　　Start by creating an auxiliary object like a cube or cylinder to use as a cutting tool. Position this object where you want to cut the model. Select the model and add a Boolean modifier from the Modifier panel on the right.

　　Setting up Boolean Modifier

　　In the Boolean modifier settings, select the auxiliary object as the cutting tool and choose the type of operation (Intersection, Difference, or Union). Apply the modifier to see the model cut according to your specifications.

　　Using Bisect Tool for Cutting

　　The Bisect tool is a simple yet effective tool for splitting models into two parts.

　　Enabling Bisect Tool

　　Select the object you want to cut and enter Edit Mode. From the left-side toolbar, choose the "Bisect" tool.

　　Performing the Cut

　　Click to start the cut at the desired point on the model, then drag the mouse to the endpoint and release it. Adjust the position and angle of the cut line in the tool settings for precise cutting effects.

　　Using Polygonal Modeling Tools for Cutting

　　For more complex cutting operations, such as creating intricate shapes on models, you can use polygonal modeling tools.

　　Creating Cutting Shapes

　　Start by creating a plane or other basic shape, then use tools like Extrude, Scale, etc., in Edit Mode to create complex cutting shapes.

　　Using Boolean Modifier

　　Position the cutting shape on the model and add and set up a Boolean modifier as described earlier. This allows you to achieve complex cutting effects.

　　Optimization and Adjustment

　　After cutting the model, you may need to optimize and adjust it to ensure quality and integrity.

　　Cleaning Up Mesh

　　Cutting operations may leave behind redundant vertices and edges. Use tools like "Remove Doubles" and "Recalculate Normals" to clean up the mesh.

　　Smoothing Surfaces

　　If cutting creates uneven surfaces, use the Smooth tool and Subdivision Surface modifier to smooth them out.

　　Checking UV Mapping

　　After cutting the model, UV mapping may need readjustment. Enter UV Editing mode to check and fix UV mapping for correct texture display.

　　Cutting a 3D model is a common and critical operation in Blender's modeling process. By using tools like Knife, Boolean modifier, Bisect, and polygonal modeling tools, you can achieve various cutting effects and ensure model quality through optimization and adjustment.

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