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authorDan Goodliffe <dan@randomdan.homeip.net>2023-11-02 20:38:10 +0000
committerDan Goodliffe <dan@randomdan.homeip.net>2023-11-02 20:38:10 +0000
commit8a5d36623e4fa261aea16731954c9987dcbb1ef1 (patch)
tree1b00a22c77affc45babb1401e9ffe73d07347224 /game
parentGeneric N-dimensional terrain triangle (diff)
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Terrain mesh method for getting the height/position at a point on the surface
Diffstat (limited to 'game')
-rw-r--r--game/terrain2.cpp11
-rw-r--r--game/terrain2.h2
2 files changed, 13 insertions, 0 deletions
diff --git a/game/terrain2.cpp b/game/terrain2.cpp
index 8d29143..b129284 100644
--- a/game/terrain2.cpp
+++ b/game/terrain2.cpp
@@ -1,5 +1,7 @@
#include "terrain2.h"
#include <fstream>
+#include <glm/gtx/intersect.hpp>
+#include <maths.h>
TerrainMesh::TerrainMesh(const std::filesystem::path & input)
{
@@ -124,6 +126,15 @@ TerrainMesh::findPoint(glm::vec2 p, OpenMesh::FaceHandle f) const
return f;
}
+glm::vec3
+TerrainMesh::positionAt(const PointFace & p) const
+{
+ glm::vec3 out {};
+ Triangle<3> t {this, fv_range(p.face(this))};
+ glm::intersectLineTriangle(p.point ^ 0.F, up, t[0], t[1], t[2], out);
+ return p.point ^ out[0];
+}
+
void
TerrainMesh::walk(const PointFace & from, const glm::vec2 to, const std::function<void(FaceHandle)> & op) const
{
diff --git a/game/terrain2.h b/game/terrain2.h
index c2c3d19..f1d288e 100644
--- a/game/terrain2.h
+++ b/game/terrain2.h
@@ -58,6 +58,8 @@ public:
[[nodiscard]] FaceHandle findPoint(glm::vec2) const;
[[nodiscard]] FaceHandle findPoint(glm::vec2, FaceHandle start) const;
+ [[nodiscard]] glm::vec3 positionAt(const PointFace &) const;
+
void walk(const PointFace & from, const glm::vec2 to, const std::function<void(FaceHandle)> & op) const;
void walkUntil(const PointFace & from, const glm::vec2 to, const std::function<bool(FaceHandle)> & op) const;