Accessing BIM Components: Identifying Global and Express IDs through Selection

Question

Accessing BIM Components: Identifying Global and Express IDs through Selection

As I delve into the task of handpicking specific elements from the intricate web of an IFC model, my approach involves utilizing a SimpleRayCaster to cast a ray onto the object with relative success. The challenge lies in identifying the exact entity intersected by the ray, as I am currently only met with a FragmentMesh as a response. My quest now is to decipher how I can extract the expressId or global id of this particular entity for individual highlighting, rather than receiving a generic array of ids encompassing all entities of its type. I'm keen to explore alternative methods that do not necessitate the use of a highlighter.

Thus far, my efforts have culminated in performing a ray-cast and obtaining a fragment-mesh containing a fragment, albeit devoid of any unique identifiers.

javascript typescript bim

Answer 1

Answer №1

To obtain the ExpressId or GlobalID/Guid, you can follow these steps. Keep in mind that the raycast intersection provides the following output: https://i.sstatic.net/b7zSF.png

i) Begin by selecting the FragmentMesh.uuid property to acquire the GUID:

const guid = raycast.object.uuid

The GUID will look something like this: "ebe4a0e0-e815-4978-8e4b-601fcb711b82"

ii) For the express Id, there are various methods to retrieve it. One approach is to utilize the FragmentsGroup which represents your model. You would iterate through its items and locate the one with an id property matching the guid from the raycast:

const fragment = model.items.find(x=>x.id===guid );

Subsequently, the ids from the fragment represent your expressIds. The list may contain more than 1 item if it's an instancedMesh object. To access the desired instance, make use of the raycast output:

const index = raycast.instanceId;
const expressId = fragment.ids[index];

If you intend to highlight the mesh using the expressId or GUID, consider adjusting the fragmentMesh.material.color property:

const mat = mesh.material[0] as THREE.MeshLambertMaterial;
mat.color = new THREE.Color("red");

When transitioning to another selection, you can revert the material back to its original state:

const mat = mesh.material[0] as THREE.MeshLambertMaterial;
mat.color = new THREE.Color(1, 1, 1);

Answer 2

To obtain the ExpressId or GlobalID/Guid, you can follow these steps. Keep in mind that the raycast intersection provides the following output: https://i.sstatic.net/b7zSF.png

i) Begin by selecting the FragmentMesh.uuid property to acquire the GUID:

const guid = raycast.object.uuid

The GUID will look something like this: "ebe4a0e0-e815-4978-8e4b-601fcb711b82"

ii) For the express Id, there are various methods to retrieve it. One approach is to utilize the FragmentsGroup which represents your model. You would iterate through its items and locate the one with an id property matching the guid from the raycast:

const fragment = model.items.find(x=>x.id===guid );

Subsequently, the ids from the fragment represent your expressIds. The list may contain more than 1 item if it's an instancedMesh object. To access the desired instance, make use of the raycast output:

const index = raycast.instanceId;
const expressId = fragment.ids[index];

If you intend to highlight the mesh using the expressId or GUID, consider adjusting the fragmentMesh.material.color property:

const mat = mesh.material[0] as THREE.MeshLambertMaterial;
mat.color = new THREE.Color("red");

When transitioning to another selection, you can revert the material back to its original state:

const mat = mesh.material[0] as THREE.MeshLambertMaterial;
mat.color = new THREE.Color(1, 1, 1);

Accessing BIM Components: Identifying Global and Express IDs through Selection

Answer №1

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