CODEWITHSUNDEEP
autodesk-forgerevit-api
mertyacan
mertyacan

Reputation: 49

Autodesk Forge Viewer - Revit Location Point

Is there a way to get element position information from a Revit project viewed on Forge Viewer? We will be moving elements on Forge Viewer (mostly Family Instances) and I need to find out the new position of the elements after they are moved. It should match with the Revit API LocationPoint data.

Upvotes: 0

Views: 204

Answers (1)

Petr Broz
Petr Broz

Reputation: 9942

When a design file (Revit, or any other supported file format) is processed by the Model Derivative service, and converted into the viewer format (SVF or SVF2), every element is turned into a "fragment" with its own transformation matrix. You can read (and even modify) the fragment information using the Viewer API:

const frags = viewer.model.getFragmentList();
function listFragmentProperties(fragId) {
  console.log('Fragment ID:', fragId);
  const objectIds = frags.getDbIds(fragId); // Get IDs of all objects linked to this fragment
  console.log('Linked object IDs:', objectIds);
  let matrix = new THREE.Matrix4();
  frags.getWorldMatrix(fragId, matrix); // Get the fragment's world matrix
  console.log('World matrix:', matrix);
  let bbox = new THREE.Box3();
  frags.getWorldBounds(fragId, bbox); // Get the fragment's world bounds
  console.log('World bounds:', bbox);
}

And to modify the transformation of a fragment, try the following:

const frags = viewer.model.getFragmentList();
function modifyFragmentTransform(fragId) {
  let scale = new THREE.Vector3();
  let rotation = new THREE.Quaternion();
  let translation = new THREE.Vector3();
  frags.getAnimTransform(fragId, scale, rotation, translation);
  translation.z += 10.0;
  scale.x = scale.y = scale.z = 1.0;
  frags.updateAnimTransform(fragId, scale, rotation, translation);
}

Upvotes: 1

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