javascript - Is there a way to generate section planes through API?

Question

How to generate section planes through Viewer API?

Like this screenshot:

Answer 1

Yes, you can set the cut plane through the viewer.setCutPlanes() function, which accepts an array of THREE.Vector4, which is an array of cut planes. Each THREE.Vector4 represents an advanced mathematical surface equation ax + by + cz + d = 0 . The normal direction of this surface equation is (a,b,c) and is d from the origin of the coordinates. Unit. In addition, Forge Viewer also uses (x, y, z) of THREE.Vector4 to represent the normal direction of the surface (a, b, c), and w represents the distance d from the origin. The calling example is as follows:

var cutplanes = [
    new THREE.Vector4( 0, 0, -1, -17 ),
    new THREE.Vector4( 0, 0, 1, 0 ),
];

veiwer.setCutPlanes( cutplanes );

Screenshot of results:

If you want to cancel the cutting, just call viewer.setCutPlanes() without passing in any parameters. After canceling, the house will return to its original state:

Answer 2

Hello Kang Gong, I am Xiao Zhao. I have asked you about your reputation in Shanghai. Now I would like to ask you whether the displayed part can be selected by default after the model is cut (triggering the that.viewer.getSelection() event). I am just getting started with forge, and this problem has been bothering me for a while.