@woosh/meep-engine/src/engine/graphics/geometry/MikkT/GetPosition.js

Pure JavaScript game engine. Fully featured and production ready.

/**
 *
 * @param {vec3|Float32Array|number[]} out
 * @param {number} out_offset
 * @param {SMikkTSpaceContext} pContext
 * @param {number} index
 */
export function GetPosition(out, out_offset, pContext, index) {

    // inlined : IndexToData(&iF, &iI, index);
    const iI = index & 0x3;
    const iF = index >> 2;

    // figure out which vertex it is
    const vertex_index = pContext.geometry_buffer_index[iF * 3 + iI];

    const position = pContext.geometry_buffer_vertex_position;

    const position_offset = vertex_index * 3;

    out[out_offset] = position[position_offset];
    out[out_offset + 1] = position[position_offset + 1];
    out[out_offset + 2] = position[position_offset + 2];

}