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| author | Dan Goodliffe <dan@randomdan.homeip.net> | 2023-12-02 12:26:36 +0000 |
|---|---|---|
| committer | Dan Goodliffe <dan@randomdan.homeip.net> | 2023-12-02 12:26:36 +0000 |
| commit | 0f56b13766fc6d8b45dabc4febf378756620ab32 (patch) | |
| tree | 1670f69c5b79028ab4fd6c4e8e5eae3fb439ddbe /game/geoData.cpp | |
| parent | Add crossInt - cross product for integer vectors (diff) | |
| download | ilt-0f56b13766fc6d8b45dabc4febf378756620ab32.tar.bz2 ilt-0f56b13766fc6d8b45dabc4febf378756620ab32.tar.xz ilt-0f56b13766fc6d8b45dabc4febf378756620ab32.zip | |
Replace positionAt with pure integer version
Diffstat (limited to 'game/geoData.cpp')
| -rw-r--r-- | game/geoData.cpp | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/game/geoData.cpp b/game/geoData.cpp index 70133a9..d092d00 100644 --- a/game/geoData.cpp +++ b/game/geoData.cpp @@ -155,6 +155,16 @@ namespace { static_assert(linesCrossLtR({1, 1}, {2, 2}, {1, 2}, {2, 1})); static_assert(!linesCrossLtR({2, 2}, {1, 1}, {1, 2}, {2, 1})); + + constexpr GlobalPosition3D + positionOnTriangle(const GlobalPosition2D point, const GeoData::Triangle<3> & t) + { + const glm::vec<3, int64_t> a = t[1] - t[0], b = t[2] - t[0]; + const auto n = crossInt(a, b); + return {point, ((n.x * t[0].x) + (n.y * t[0].y) + (n.z * t[0].z) - (n.x * point.x) - (n.y * point.y)) / n.z}; + } + + static_assert(positionOnTriangle({7, -2}, {{1, 2, 3}, {1, 0, 1}, {-2, 1, 0}}) == GlobalPosition3D {7, -2, 3}); } OpenMesh::FaceHandle @@ -179,10 +189,7 @@ GeoData::findPoint(GlobalPosition2D p, OpenMesh::FaceHandle f) const GlobalPosition3D GeoData::positionAt(const PointFace & p) const { - RelativePosition3D out {}; - const auto t = triangle<3>(p.face(this)); - glm::intersectLineTriangle<RelativePosition3D>({p.point, 0}, up, t[0], t[1], t[2], out); - return {p.point, out[0]}; + return positionOnTriangle(p.point, triangle<3>(p.face(this))); } [[nodiscard]] std::optional<GlobalPosition3D> |