Method pickAtom2D

App/interaction/picking/PickingSystem.cpp:113–140

}

bool PickingSystem::pickAtom2D(glm::ivec2 screenPos, float tolerance, AtomHit& hit) const {
    BaseRenderer* rend = renderer->get();
    float bestDistSqr = 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 glm::ivec2 atomScreen{rend->camera.worldToScreen(worldPos)};
        const glm::ivec2 d = atomScreen - screenPos;
        const float distSqr = static_cast<float>(d.x * d.x + d.y * d.y);

        // радиус атома в экранных пикселях
        const float atomRadius = AtomData::getProps(atomStorage->type(i)).radius;
        const float screenRadius = atomRadius * rend->camera.getZoom() + tolerance;

        if (distSqr < screenRadius * screenRadius && distSqr < bestDistSqr) {
            bestDistSqr = distSqr;
            bestIndex = i;
        }
    }

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

    hit = {bestIndex, atomStorage->atomId(bestIndex), std::sqrt(bestDistSqr)};
    return true;
}

// 3D: ray cast — ищем ближайший атом вдоль луча
bool PickingSystem::pickAtom3D(glm::ivec2 screenPos, AtomHit& hit) const {