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fix

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Orange
2026-04-23 18:33:00 +03:00
parent 3eb9daf10b
commit 2eccb4023f
1 changed files with 25 additions and 6 deletions
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31
source/engines/unreal_engine/formulas.cpp
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@@ -2,7 +2,6 @@
// Created by Vlad on 3/22/2025.
//
#include "omath/engines/unreal_engine/formulas.hpp"
namespace omath::unreal_engine
{
Vector3<float> forward_vector(const ViewAngles& angles) noexcept
@@ -25,7 +24,7 @@ namespace omath::unreal_engine
}
Mat4X4 calc_view_matrix(const ViewAngles& angles, const Vector3<float>& cam_origin) noexcept
{
return mat_camera_view<float, MatStoreType::ROW_MAJOR>(forward_vector(angles), -right_vector(angles),
return mat_camera_view<float, MatStoreType::ROW_MAJOR>(forward_vector(angles), right_vector(angles),
up_vector(angles), cam_origin);
}
Mat4X4 rotation_matrix(const ViewAngles& angles) noexcept
@@ -34,13 +33,33 @@ namespace omath::unreal_engine
* mat_rotation_axis_z<float, MatStoreType::ROW_MAJOR>(angles.yaw)
* mat_rotation_axis_y<float, MatStoreType::ROW_MAJOR>(-angles.pitch);
}
Mat4X4 calc_perspective_projection_matrix(const float field_of_view, const float aspect_ratio, const float near,
const float far, const NDCDepthRange ndc_depth_range) noexcept
{
if (ndc_depth_range == NDCDepthRange::ZERO_TO_ONE)
return mat_perspective_left_handed<float, MatStoreType::ROW_MAJOR, NDCDepthRange::ZERO_TO_ONE>(
field_of_view, aspect_ratio, near, far);
// UE stores horizontal FOV in FMinimalViewInfo — mirror engine's
// FMinimalViewInfo::CalculateProjectionMatrixGivenViewRectangle:
// XAxisMultiplier = 1 / tan(hfov/2)
// YAxisMultiplier = aspect / tan(hfov/2)
const float inv_tan_half_hfov = 1.f / std::tan(angles::degrees_to_radians(field_of_view) / 2.f);
const float x_axis = inv_tan_half_hfov;
const float y_axis = inv_tan_half_hfov * aspect_ratio;
return mat_perspective_left_handed(field_of_view, aspect_ratio, near, far);
if (ndc_depth_range == NDCDepthRange::ZERO_TO_ONE)
return {
{x_axis, 0, 0, 0},
{0, y_axis, 0, 0},
{0, 0, far / (far - near), -(near * far) / (far - near)},
{0, 0, 1, 0},
};
if (ndc_depth_range == NDCDepthRange::NEGATIVE_ONE_TO_ONE)
return {
{x_axis, 0, 0, 0},
{0, y_axis, 0, 0},
{0, 0, (far + near) / (far - near), -(2.f * far * near) / (far - near)},
{0, 0, 1, 0},
};
std::unreachable();
}
} // namespace omath::unreal_engine