Cut Meshes In Half Using Material Graphs

You can create a slice effect by first creating an emissive node graph to create a solid material, then using the mesh world position data and a TransformPosition material node to determine where to cut the mesh.

This material is effective for halving meshes for things like if you want to place a mesh flush against a wall without it bleeding through to the other side, or for creating a maze path for players using a static mesh as a wall piece.

Creating the Emissive Node Graph

You can copy a node that's already using the emissive graph and delete the part of the graph that you don’t need, then add the necessary node configuration to create the effect.

1. Select the material root node and check the Two Sided option in the Details panel.

2. Open the Blend Mode dropdown menu and select Masked1.

3. Add the following nodes to your material by right-clicking in the node graph and searching for the specified name:

   1. 3 X Constant node
   2. 2 X Constant 3Vector expression node
   3. 2 X Clamp node
   4. Append3Vector node
   5. WorldPosition node
   6. Subtract node
   7. Dot Product node
   8. Multiply node
   9. Linear Interpolate node
   10. TwoSidedSign node

4. Double-click the first Constant3Vector node and add an exterior color to the material.

5. Drag off the white pin from the first Constant3Vector node and plug into the Base Color input on the material root node.

6. Drag off the pin of the first Constant node and plug into the Roughness input on the material root node, then change the value to 0.75.