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-rw-r--r--game/geoData.cpp166
-rw-r--r--game/geoData.h2
-rw-r--r--test/test-geoData.cpp60
3 files changed, 228 insertions, 0 deletions
diff --git a/game/geoData.cpp b/game/geoData.cpp
index 0dbc0ac..86b9152 100644
--- a/game/geoData.cpp
+++ b/game/geoData.cpp
@@ -1,7 +1,10 @@
#include "geoData.h"
+#include "collections.h"
#include <fstream>
#include <glm/gtx/intersect.hpp>
+#include <math.h>
#include <maths.h>
+#include <set>
GeoData
GeoData::loadFromAsciiGrid(const std::filesystem::path & input)
@@ -375,3 +378,166 @@ GeoData::triangleContainsTriangle(const Triangle<2> & a, const Triangle<2> & b)
{
return triangleContainsPoint(a.x, b) && triangleContainsPoint(a.y, b) && triangleContainsPoint(a.z, b);
}
+
+void
+GeoData::setHeights(const std::span<const GlobalPosition3D> triangleStrip)
+{
+ std::set<EdgeHandle> nosplit;
+ // Create new vertices
+ std::vector<VertexHandle> newVerts;
+ newVerts.reserve(newVerts.size());
+ std::transform(triangleStrip.begin(), triangleStrip.end(), std::back_inserter(newVerts), [this](const auto tsVert) {
+ return add_vertex(tsVert);
+ });
+ // Create new faces
+ std::vector<FaceHandle> newFaces;
+ newFaces.reserve(newVerts.size() - 2);
+ std::transform(strip_begin(newVerts), strip_end(newVerts), std::back_inserter(newFaces),
+ [this, &nosplit](const auto & newVert) {
+ const auto [a, b, c] = newVert;
+ auto faceHandle = add_face(a, b, c);
+ std::copy(fe_begin(faceHandle), fe_end(faceHandle), std::inserter(nosplit, nosplit.end()));
+ return faceHandle;
+ });
+ std::vector<HalfedgeHandle> boundary;
+ boundaryWalk(
+ [out = std::back_inserter(boundary)](const auto boundaryHeh) mutable {
+ out = boundaryHeh;
+ },
+ *voh_begin(newVerts.front()));
+
+ // Extrude corners
+ std::set<VertexHandle> cutpoints;
+ std::vector<std::pair<GlobalPosition3D, GlobalPosition3D>> extrusionExtents;
+ std::vector<VertexHandle> extrusionVertices;
+ std::transform(boundary.begin(), boundary.end(), std::back_inserter(extrusionExtents),
+ [this, &nosplit, &cutpoints, &extrusionVertices](const auto boundaryHeh) {
+ const auto vectorNormal
+ = []<typename T, glm::qualifier Q>(const glm::vec<2, T, Q> & v) -> glm::vec<2, T, Q> {
+ return {-v.y, v.x};
+ };
+
+ const auto p0 = point(from_vertex_handle(prev_halfedge_handle(boundaryHeh)));
+ const auto p1 = point(from_vertex_handle(boundaryHeh));
+ const auto p2 = point(to_vertex_handle(boundaryHeh));
+ const auto e0 = glm::normalize(vectorNormal(RelativePosition2D(p1 - p0)));
+ const auto e1 = glm::normalize(vectorNormal(RelativePosition2D(p2 - p1)));
+ const auto mid = glm::normalize((e0 + e1) / 2.F);
+ const auto doExtrusion = [mid, p1, this, &nosplit, &cutpoints, &extrusionVertices](
+ RelativeDistance vert, GlobalDistance limit) {
+ const auto extrusionDir = glm::normalize(mid || vert);
+
+ if (const auto intersect = intersectRay({p1, extrusionDir})) {
+ auto splitVertex = split(intersect->second, intersect->first);
+ cutpoints.insert(splitVertex);
+ extrusionVertices.push_back(splitVertex);
+ std::copy(ve_begin(splitVertex), ve_end(splitVertex), std::inserter(nosplit, nosplit.end()));
+ }
+
+ const auto extrusion
+ = extrusionDir * std::max(0.F, RelativeDistance(limit - p1.z) / extrusionDir.z);
+ return p1 + GlobalPosition3D(extrusion);
+ };
+ return std::make_pair(doExtrusion(-2, lowerExtent.z - 100), doExtrusion(2, upperExtent.z + 100));
+ });
+
+ // Cut existing terrain
+ extrusionExtents.emplace_back(extrusionExtents.front()); // Circular next
+ extrusionVertices.emplace_back(extrusionVertices.front());
+ std::vector<std::vector<VertexHandle>> boundaryFaces;
+ std::transform(boundary.begin(), boundary.end(), std ::back_inserter(boundaryFaces),
+ [ex = extrusionExtents.begin(), exv = extrusionVertices.begin(), this, &nosplit](
+ const auto boundaryHeh) mutable {
+ const auto fromVertex = from_vertex_handle(boundaryHeh);
+ const auto p0 = point(fromVertex);
+ auto toVertex = to_vertex_handle(boundaryHeh);
+ const auto p1 = point(toVertex);
+ const auto nex = ex + 1;
+ const auto nexv = exv + 1;
+ const std::array<Triangle<3>, 4> triangles {{
+ {p0, ex->first, nex->first},
+ {p0, p1, nex->first},
+ {p0, ex->second, nex->second},
+ {p0, p1, nex->second},
+ }};
+
+ std::vector<VertexHandle> sideVerts {fromVertex, *exv};
+ for (auto currentVertex = *exv;
+ std::any_of(voh_begin(currentVertex), voh_end(currentVertex), [&](const auto currentVertexOut) {
+ const auto next = next_halfedge_handle(currentVertexOut);
+ const auto nextVertex = to_vertex_handle(next);
+ const auto startVertex = from_vertex_handle(next);
+ if (nextVertex == *++sideVerts.rbegin()) {
+ // This half edge goes back to the previous vertex
+ return false;
+ }
+ if (nextVertex == *nexv) {
+ // The next half edge goes to the termination point
+ return false;
+ }
+ const auto edge = edge_handle(next);
+ if (nosplit.contains(edge)) {
+ // This edge should not be split (for some reason, maybe no longer applies)
+ return false;
+ }
+ const auto ep0 = point(startVertex);
+ const auto ep1 = point(nextVertex);
+ const auto diff = RelativePosition3D(ep1 - ep0);
+ const auto length = glm::length(diff);
+ const auto dir = diff / length;
+ const Ray r {ep0, dir};
+ return std::any_of(triangles.begin(), triangles.end(), [&](const auto & triangle) {
+ BaryPosition bary;
+ RelativeDistance dist {};
+
+ if (r.intersectTriangle(triangle.x, triangle.y, triangle.z, bary, dist)
+ && dist <= length - 1 && dist >= 1) {
+ const auto splitPos = triangle * bary;
+ currentVertex = sideVerts.emplace_back(split(edge, splitPos));
+ return true;
+ }
+ return false;
+ });
+ });) {
+ ;
+ }
+ sideVerts.emplace_back(*nexv);
+ sideVerts.emplace_back(toVertex);
+ ex = nex;
+ exv++;
+ return sideVerts;
+ });
+
+ // Remove old faces
+ std::set<FaceHandle> visited;
+ auto removeOld = [&](auto & self, const auto face) -> void {
+ if (visited.insert(face).second) {
+ std::vector<FaceHandle> neighbourFaces;
+ std::for_each(fh_begin(face), fh_end(face), [&](const auto fh) {
+ if (std::none_of(boundaryFaces.begin(), boundaryFaces.end(), [fh, this](const auto & bf) {
+ return std::find(bf.begin(), bf.end(), from_vertex_handle(fh)) != bf.end()
+ && std::find(bf.begin(), bf.end(), to_vertex_handle(fh)) != bf.end();
+ })) {
+ neighbourFaces.emplace_back(opposite_face_handle(fh));
+ }
+ });
+
+ delete_face(face, false);
+ std::for_each(neighbourFaces.begin(), neighbourFaces.end(), [&self](const auto nextFace) {
+ if (nextFace.is_valid()) {
+ self(self, nextFace);
+ }
+ });
+ }
+ };
+ removeOld(removeOld, findPoint(triangleStrip.front()));
+
+ std::for_each(boundaryFaces.begin(), boundaryFaces.end(), [&](auto & boundaryFace) {
+ std::reverse(boundaryFace.begin(), boundaryFace.end());
+ add_face(boundaryFace);
+ });
+
+ // Tidy up
+ garbage_collection();
+ update_vertex_normals_only();
+}
diff --git a/game/geoData.h b/game/geoData.h
index 6c6ae26..4d8e11c 100644
--- a/game/geoData.h
+++ b/game/geoData.h
@@ -89,6 +89,8 @@ public:
[[nodiscard]] HalfedgeHandle findEntry(const GlobalPosition2D from, const GlobalPosition2D to) const;
+ void setHeights(const std::span<const GlobalPosition3D> triangleStrip);
+
[[nodiscard]] auto
getExtents() const
{
diff --git a/test/test-geoData.cpp b/test/test-geoData.cpp
index f8437c3..6602b05 100644
--- a/test/test-geoData.cpp
+++ b/test/test-geoData.cpp
@@ -1,7 +1,12 @@
#define BOOST_TEST_MODULE terrain
+#include "game/terrain.h"
+#include "test/testMainWindow.h"
+#include "test/testRenderOutput.h"
#include "testHelpers.h"
+#include "ui/applicationBase.h"
#include <boost/test/data/test_case.hpp>
#include <boost/test/unit_test.hpp>
+#include <gfx/gl/sceneRenderer.h>
#include <stream_support.h>
#include <game/geoData.h>
@@ -199,3 +204,58 @@ BOOST_DATA_TEST_CASE(findEntries,
{
BOOST_CHECK_EQUAL(fixedTerrtain.findEntry(from, to).idx(), heh);
}
+
+BOOST_AUTO_TEST_CASE(setTriangle, *boost::unit_test::timeout(5))
+{
+ auto gd = std::make_shared<GeoData>(GeoData::createFlat({0, 0}, {1000000, 1000000}, 100));
+ std::array points {
+ GlobalPosition3D {70100, 123000, 6000},
+ GlobalPosition3D {50100, 52300, 6000},
+ GlobalPosition3D {191000, 283000, 8000},
+ GlobalPosition3D {241000, 123330, -2000},
+ };
+ BOOST_CHECK_NO_THROW(gd->setHeights(points));
+
+ ApplicationBase ab;
+ TestMainWindow tmw;
+ TestRenderOutput tro {{1792, 1024}};
+
+ SceneRenderer ss {tro.size, tro.output};
+ ss.camera.setView({-90000, -90000, 300000}, glm::normalize(glm::vec3 {1, 1, -1.5F}));
+
+ struct TestTerrain : public SceneProvider {
+ explicit TestTerrain(std::shared_ptr<GeoData> gd) : terrain(std::move(gd)) { }
+
+ const Terrain terrain;
+
+ void
+ content(const SceneShader & shader) const override
+ {
+ glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+ terrain.render(shader);
+ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+ }
+
+ void
+ environment(const SceneShader &, const SceneRenderer & sr) const override
+ {
+ sr.setAmbientLight({0.1, 0.1, 0.1});
+ sr.setDirectionalLight({1, 1, 1}, south + down, *this);
+ }
+
+ void
+ lights(const SceneShader &) const override
+ {
+ }
+
+ void
+ shadows(const ShadowMapper & shadowMapper) const override
+ {
+ terrain.shadows(shadowMapper);
+ }
+ };
+
+ TestTerrain t {gd};
+ BOOST_CHECK_NO_THROW(ss.render(t));
+ Texture::save(tro.outImage, "/tmp/geoData.tga");
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 03:06:24 +0000