I am trying to create a cone that can rotate around its top point, where the cone's thickness is at its smallest. I have been unable to determine how to set the rotation point for this movement.
var coneGeometry = new THREE.CylinderGeometry(1000, 0, width, 50, 50, false);
var cone = new THREE.Mesh(coneGeometry, material);
cone.position.x = x;
cone.position.y = y + width / 2;
cone.position.z = z;
// My goal is to rotate the cone around the specified (x, y, z) location
cone.rotation.x = dip;
The cone's geometry is centered at the origin, but to position it properly you will need to translate it so that the tip of the cone aligns with the origin point.
coneGeometry.applyMatrix( new THREE.Matrix4().makeTranslation( 0, coneHeight/2, 0 ) );
(The direction of the translation changes based on whether the small end or the large end of the cone is being used.)
After this translation, any rotation applied to the cone will pivot around the tip. The tip will remain in its designated position.
UPDATE: An alternative method available now is:
coneGeometry.translate( 0, coneHeight/2, 0 ); // three.js r.72
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