Seeking a solution for mapping a 3D object in Three.js to a point on its surface and finding the corresponding point on a texture file using x,y coordinates.
Currently, I am using raycasting to locate points on the object's face, each of which should correspond to the texture map. Is there a recognized method for extracting this information, possibly by reversing the UV Mapping function? If not, I will persist in solving the issue and share my solution once I have it.
This problem was successfully resolved by utilizing the following approach:
//Locate the Index of the face positioned at the center of the display
var vector = new THREE.Vector3(0, 0, 0.5);
projector.unprojectVector(vector, camera);
var raycaster = new THREE.Raycaster(camera.position, vector.sub(camera.position).normalize());
var intersects = raycaster.intersectObject(object, true);
if (intersects.length > 0) {
var index = intersects[0].faceIndex;
}
//Determine the UV Coordinates of the three vertices of the face at that specific index
var point1, point2, point3;
point1.x = objectGlobal.children[0].geometry.faceVertexUvs[0][index][0].x;
point1.y = objectGlobal.children[0].geometry.faceVertexUvs[0][index][0].y;
point2.x = objectGlobal.children[0].geometry.faceVertexUvs[0][index][1].x;
point2.y = objectGlobal.children[0].geometry.faceVertexUvs[0][index][1].y;
point3.x = objectGlobal.children[0].geometry.faceVertexUvs[0][index][2].x;
point3.y = objectGlobal.children[0].geometry.faceVertexUvs[0][index][2].y;
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