Modifying Garage Height in Three.js

To change the height of your garage model without affecting the entrance proportions, you have a few options:

Option 1: Use EdgeSplitModifier

The EdgeSplitModifier in Three.js can help you split the geometry at specific edges, which would allow you to manipulate only the upper portion of the garage. This approach would let you maintain the entrance dimensions while adjusting the overall height.

Option 2: Modify the Geometry Vertices Directly

If you have access to the geometry data, you can manipulate specific vertices to increase the height:

JAVASCRIPTCopied
// Assuming 'garage' is your loaded model
const geometry = garage.geometry;

// Get the vertices
const positions = geometry.attributes.position.array;

// Loop through vertices and modify only those above a certain height
// (where your entrance ends)
const entranceHeight = 2.5; // Set this to where your entrance ends

for (let i = 0; i < positions.length; i += 3) {
  // Y coordinate is typically the height (positions[i+1])
  if (positions[i + 1] > entranceHeight) {
    // Scale only vertices above the entrance
    positions[i + 1] = positions[i + 1] * heightScaleFactor;
  }
}

// Update the geometry
geometry.attributes.position.needsUpdate = true;
geometry.computeVertexNormals(); // Recalculate normals

Option 3: Use Constructive Solid Geometry (CSG)

If your model is more complex, you might need to use CSG operations to:

1. Split the model at the entrance height
2. Scale only the upper portion
3. Recombine the parts

Unfortunately, without dividing the model into separate meshes, your options are somewhat limited. The most precise approach would be to modify the original 3D model in a modeling software before importing it into Three.js, or to use one of the geometry manipulation techniques described above.