ProBuilder Tutorial: Building a Structure with Interior and Exterior

In this tutorial, we’ll go step-by-step through one method of constructing a simple “house”, with both an interior and exterior.

Step 1: Outline the Structure with Polyshape

  1. Click the New Polyshape button in the ProBuilder Toolbar
  2. Click in the scene to set Polyshape points, creating a rough outline of the structure
  3. Complete your outline by connecting back to your first point, or hit the Spacebar on your keyboard
  4. Move the mouse up and down to set the Polyshape’s height, then click to accept the height
  5. Click and drag on any points to edit them, or click on a line to add more points
  6. When your Polyshape is complete, hit the Escape key on your keyboard or click the “Editing Polyshape” button in the Inspector

More Info:

This is a great use for the Polyshape tool- simply click point to point like drawing a map on grid paper, then pull it up to the height you need.

Step 2: Delete the Top and Bottom Faces

  1. Enable Face Editing
  2. Click the top face to select it, then hold Shift and click the bottom face to add it to the selection
  3. Click the Delete Faces button in the ProBuilder Toolbar, or press Backspace on your keyboard

More Info:

Simplicity is the key to good modeling!

  • Bottom Faces: We’ll never see these in-game, so that’s an instant delete
  • Top Faces: We could potentially use these to model out the roof, but it’ll be much easier to delete them and instead build the inner and outer surfaces seperately

    Step 3: Before Extruding the Roof, Add Detail

    1. Enable Edge Editing
    2. Select edges 1 and 2
    3. Click Connect Edges in the ProBuilder Toolbar, or press “ALT – E” on your keyboard

    More Info:

    We want to bring edges A, B, and C together to form the inner roof peak. However, there are 2 edges on the left (A and B) and just one edge on the right (C). Let’s fix that so each side has 2 edges, allowing the geometry to match up nicely.

      Q: Why not simply add a Vertex to Edge C?

      A: That could also work, but would create a 5-sided polygon, and it’s generally best to stick with quads (4 sides). Quads deform better, and enable clean edge loop modeling.

      Step 4: Form the Inner Roof Peak

      1. Select the inner roof edges
      2. Hold Shift and click-drag on the green “Up” arrow to Extrude the edges upwards
      3. Move the edges together
      4. Enable Vertex Editing
      5. Drag-select all the vertices and click Weld Vertices, or press “ALT – V” on your keyboard

      More Info:

      • Edge Extrusion is a great way to quickly add geometry and detail to your meshes
      • Welding vertices is just like welding metal- make sure you do this, or your mesh will fall apart!

      Step 5: Bridge Doorway Edges

      1. Select the edges above the doorway
      2. Click the Bridge Edges button in the ProBuilder Toolbar, or press “ALT – B” on your keyboard
      3. Repeat for the edges below the doorway

      More Info:

      • We need to seperate the top and bottom sections, so that we can use the “Fill Hole” tool more easily (in the next step). To do that, we bridge the upper and lower doorway gaps.

      Step 6: Fill Holes in Ceiling

      1. Select an edge on each of the ceiling holes
      2. Click the Fill Hole button in the ProBuilder Toolbar

      Step 7: Fill In the Floor

      1. Select an edge on the “floor” hole
      2. Click the Fill Hole button in the ProBuilder Toolbar

      More Info:

      • Fill Hole is a very useful tool for quickly filling in sections, vs bridging many individual edges.

      Step 8: Connect Edges To Prepare Outer Roof

      1. Select the top and bottom outer edges of the right wall
      2. Click Connect Edges in the ProBuilder Toolbar, or press “ALT – B” on your keyboard

      More Info:

      • Just like Step 3, we need to add a bit of mesh detail before extruding the outer edges and forming the roof.

      Step 9: Form the Outer Roof

      1. Select the outer roof edges
      2. Hold Shift and click-drag on the green “Up” arrow to Extrude the edges upwards
      3. Move the edges together
      4. Enable Vertex Editing
      5. Drag-select all the vertices and click Weld Vertices, or press “ALT – V” on your keyboard

        Step 10: Fill Holes in the Outer Roof

        1. Select an edge from each roof hole
        2. Click the Fill Hole button in the ProBuilder Toolbar