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Orange
2026-01-26 15:43:39 +03:00
parent 47d82fe083
commit 9bd42d9c8c
4 changed files with 72 additions and 53 deletions
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45
source/3d_primitives/box.cpp
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@@ -5,50 +5,5 @@
namespace omath::primitives
{
std::array<Triangle<Vector3<float>>, 12> create_box(const Vector3<float>& top, const Vector3<float>& bottom,
const Vector3<float>& dir_forward,
const Vector3<float>& dir_right, const float ratio) noexcept
{
const auto height = top.distance_to(bottom);
const auto side_size = height / ratio;
// corner layout (0‑3 bottom, 4‑7 top)
std::array<Vector3<float>, 8> p;
p[0] = bottom + (dir_forward + dir_right) * side_size; // front‑right‑bottom
p[1] = bottom + (dir_forward - dir_right) * side_size; // front‑left‑bottom
p[2] = bottom + (-dir_forward + dir_right) * side_size; // back‑right‑bottom
p[3] = bottom + (-dir_forward - dir_right) * side_size; // back‑left‑bottom
p[4] = top + (dir_forward + dir_right) * side_size; // front‑right‑top
p[5] = top + (dir_forward - dir_right) * side_size; // front‑left‑top
p[6] = top + (-dir_forward + dir_right) * side_size; // back‑right‑top
p[7] = top + (-dir_forward - dir_right) * side_size; // back‑left‑top
std::array<Triangle<Vector3<float>>, 12> poly;
// bottom face (+Y up ⇒ wind CW when viewed from above)
poly[0] = {p[0], p[2], p[3]};
poly[1] = {p[0], p[3], p[1]};
// top face
poly[2] = {p[4], p[7], p[6]};
poly[3] = {p[4], p[5], p[7]};
// front face
poly[4] = {p[0], p[5], p[1]};
poly[5] = {p[0], p[4], p[5]};
// right face
poly[6] = {p[0], p[6], p[2]};
poly[7] = {p[0], p[4], p[6]};
// back face
poly[8] = {p[2], p[7], p[3]};
poly[9] = {p[2], p[6], p[7]};
// left face
poly[10] = {p[1], p[7], p[5]};
poly[11] = {p[1], p[3], p[7]};
return poly;
}
} // namespace omath::primitives