Method pickAtom3D

App/interaction/picking/PickingSystem.cpp:143–168

3D: ray cast — ищем ближайший атом вдоль луча

// 3D: ray cast — ищем ближайший атом вдоль луча
bool PickingSystem::pickAtom3D(glm::ivec2 screenPos, AtomHit& hit) const {
    const RenderRay ray = (*renderer)->camera.screenToRay(screenPos.x, screenPos.y);

    float bestT = std::numeric_limits<float>::max();
    size_t bestIndex = static_cast<size_t>(-1);

    for (size_t i = 0; i < atomStorage->size(); ++i) {
        const glm::vec3 worldPos = displayAtomPos(i);
        const float radius = AtomData::getProps(atomStorage->type(i)).radius;

        RenderRaySphereHit rayHit{};
        if (renderRaySphereIntersect(ray, worldPos, radius, rayHit)) {
            if (rayHit.t < bestT) {
                bestT = rayHit.t;
                bestIndex = i;
            }
        }
    }

    if (bestIndex == static_cast<size_t>(-1)) {
        return false;
    }

    hit = {bestIndex, atomStorage->atomId(bestIndex), bestT};
    return true;
}

glm::vec3 PickingSystem::displayAtomPos(size_t atomIndex) const {
    return atomStorage->pos(atomIndex) + box->getRenderOffset();