What Is the Separate XYZ Node in Blender?

The Separate XYZ node in Blender is a vector utility node used across Geometry Nodes, Shader Nodes, and the Compositor to split a single 3D vector dataset into three individual numerical outputs representing the X, Y, and Z axes. This article provides a clear breakdown of how the Separate XYZ node works, why it is essential for procedural workflows, and how to apply it practically in your 3D projects.

Understanding the Separate XYZ Node

In Blender, spatial data (like positions, normals, and scale) is usually represented as a vector—a set of three numbers written as (X, Y, Z).

The Separate XYZ node takes a vector input and separates it into three independent scalar (single-number) float values:

  • X Output: Represents horizontal movement/position along the left-to-right axis.
  • Y Output: Represents horizontal movement/position along the front-to-back axis.
  • Z Output: Represents vertical movement/position along the up-and-down axis.

By splitting vector data into these individual components, you can manipulate a single axis without affecting the other two.

Common Uses in Blender

1. Shader Nodes (Materials)

In the Shader Editor, the Separate XYZ node is frequently combined with the Texture Coordinate or Position node to isolate height or directional data:

  • Height Masks: Using the Z output from a Texture Coordinate node allows you to isolate the top or bottom of an object. This is ideal for adding procedural snow, dust, or mud to surfaces pointing upward.
  • Directional Gradients: Isolating the X or Y axis lets you create clean linear color ramps along a specific horizontal direction across a mesh.

2. Geometry Nodes

In Geometry Nodes, spatial manipulation often requires controlling isolated dimensions:

  • Selective Displacement: If you want to displace mesh vertices only along the vertical axis based on noise, you isolate the Z coordinate, apply a Math node operation, and combine it back using a Combine XYZ node.
  • Filtering Instances: You can use the Z output to select and instance objects (like trees or rocks) only on geometry above a specific altitude threshold.

How to Use It: A Basic Workflow

  1. Input: Connect a vector source (such as a Position node or Texture Coordinate node) to the Vector input of the Separate XYZ node.
  2. Modify: Connect one of the outputs (X, Y, or Z) into a Math node or a ColorRamp. For example, passing the Z output into a ColorRamp creates a black-to-white gradient based purely on height.
  3. Recombine (Optional): If you are altering geometry or texture coordinates, use a Combine XYZ node to merge the modified single-axis output back with the original unaltered axes before plugging it into the destination socket.

By separating vectors into single axes, the Separate XYZ node gives you precise control over 3D coordinates, making it a critical tool for advanced procedural shading and geometric modeling in Blender.