import isGeometry from "../is-geometry.js";
import { assert } from "../utils/assert.js";
/**
 * analyze positions of geometry
 *
 * @param geometry
 * @returns Position| New geometry |assert
 */
export function getPositions(geometry) {
    // If geometry, extract positions
    if (isGeometry(geometry)) {
        const { attributes } = geometry;
        const position = attributes.POSITION || attributes.positions;
        assert(position);
        return position;
    }
    // If arraybuffer, assume 3 components
    if (ArrayBuffer.isView(geometry)) {
        return { values: geometry, size: 3 };
    }
    // Else assume accessor object
    if (geometry) {
        assert(geometry.values);
        return geometry;
    }
    return assert(false);
}