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58 lines
2.6 KiB
C++
58 lines
2.6 KiB
C++
//
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// Created by Vlad on 3/22/2025.
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//
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#include "omath/engines/unreal_engine/formulas.hpp"
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namespace omath::unreal_engine
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{
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Vector3<double> forward_vector(const ViewAngles& angles) noexcept
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{
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const auto vec = rotation_matrix(angles) * mat_column_from_vector(k_abs_forward);
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return {vec.at(0, 0), vec.at(1, 0), vec.at(2, 0)};
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}
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Vector3<double> right_vector(const ViewAngles& angles) noexcept
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{
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const auto vec = rotation_matrix(angles) * mat_column_from_vector(k_abs_right);
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return {vec.at(0, 0), vec.at(1, 0), vec.at(2, 0)};
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}
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Vector3<double> up_vector(const ViewAngles& angles) noexcept
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{
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const auto vec = rotation_matrix(angles) * mat_column_from_vector(k_abs_up);
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return {vec.at(0, 0), vec.at(1, 0), vec.at(2, 0)};
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}
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Mat4X4 calc_view_matrix(const ViewAngles& angles, const Vector3<double>& cam_origin) noexcept
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{
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return mat_camera_view<double, MatStoreType::ROW_MAJOR>(forward_vector(angles), right_vector(angles),
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up_vector(angles), cam_origin);
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}
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Mat4X4 rotation_matrix(const ViewAngles& angles) noexcept
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{
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// UE FRotator is intrinsic Z-Y-X (Yaw → Pitch → Roll applied in local
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// frame), which for column-vector composition is Rz·Ry·Rx.
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// Pitch and roll axes in omath spin opposite to UE's convention, so
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// both carry a sign flip.
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return mat_rotation_axis_z<double, MatStoreType::ROW_MAJOR>(angles.yaw)
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* mat_rotation_axis_y<double, MatStoreType::ROW_MAJOR>(-angles.pitch)
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* mat_rotation_axis_x<double, MatStoreType::ROW_MAJOR>(-angles.roll);
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}
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Mat4X4 calc_perspective_projection_matrix(const double field_of_view, const double aspect_ratio, const double near,
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const double far, const NDCDepthRange ndc_depth_range) noexcept
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{
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// UE stores horizontal FOV in FMinimalViewInfo — use the left-handed
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// horizontal-FOV builder directly.
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if (ndc_depth_range == NDCDepthRange::ZERO_TO_ONE)
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return mat_perspective_left_handed_horizontal_fov<
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double, MatStoreType::ROW_MAJOR, NDCDepthRange::ZERO_TO_ONE>(
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field_of_view, aspect_ratio, near, far);
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if (ndc_depth_range == NDCDepthRange::NEGATIVE_ONE_TO_ONE)
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return mat_perspective_left_handed_horizontal_fov<
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double, MatStoreType::ROW_MAJOR, NDCDepthRange::NEGATIVE_ONE_TO_ONE>(
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field_of_view, aspect_ratio, near, far);
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std::unreachable();
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}
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} // namespace omath::unreal_engine
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