advance_navigation()

MAYAFLUX_API void MayaFlux::Kinesis::advance_navigation

(

NavigationState &

state

)

Advance eye position by held movement flags against elapsed time.

Computes dt from state.last_tick, moves the eye along the current forward and right vectors by the flags that are set, and updates last_tick. Does not produce a ViewTransform. Use build_view_transform() after this when the matrices are needed separately from the eye update.

Parameters

state

Navigation state (eye and last_tick mutated by this call)

Definition at line 78 of file NavigationState.cpp.

{
    const auto now = std::chrono::steady_clock::now();
    const float dt = std::chrono::duration<float>(now - st.last_tick).count();
    st.last_tick = now;
 
    const glm::vec3 forward {
        std::cos(st.pitch) * std::sin(st.yaw),
        std::sin(st.pitch),
        std::cos(st.pitch) * std::cos(st.yaw)
    };
    const glm::vec3 right = glm::normalize(glm::cross(forward, glm::vec3(0.0F, 1.0F, 0.0F)));
 
    const float step = st.move_speed * dt;
 
    glm::vec3 candidate = st.eye;
 
    if (st.forward_held)
        candidate += forward * step;
    if (st.back_held)
        candidate -= forward * step;
    if (st.left_held)
        candidate -= right * step;
    if (st.right_held)
        candidate += right * step;
    if (st.down_held)
        candidate -= glm::vec3(0.0F, 1.0F, 0.0F) * step;
    if (st.up_held)
        candidate += glm::vec3(0.0F, 1.0F, 0.0F) * step;
 
    st.eye = st.eye_constraint ? st.eye_constraint(candidate) : candidate;
}

References MayaFlux::Kinesis::NavigationState::back_held, MayaFlux::Kinesis::NavigationState::down_held, MayaFlux::Kinesis::NavigationState::eye, MayaFlux::Kinesis::NavigationState::eye_constraint, MayaFlux::Kinesis::NavigationState::forward_held, MayaFlux::Kinesis::NavigationState::last_tick, MayaFlux::Kinesis::NavigationState::left_held, MayaFlux::Kinesis::NavigationState::move_speed, MayaFlux::Kinesis::NavigationState::pitch, MayaFlux::Kinesis::NavigationState::right_held, MayaFlux::Kinesis::NavigationState::up_held, and MayaFlux::Kinesis::NavigationState::yaw.

Referenced by compute_view_transform(), and MayaFlux::Nexus::Locus::invoke_perception().

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