1 files changed, 113 insertions, 0 deletions
diff --git a/dep/g3dlite/source/MeshBuilder.cpp b/dep/g3dlite/source/MeshBuilder.cpp
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+++ b/dep/g3dlite/source/MeshBuilder.cpp
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+/**
+  @file MeshBuilder.cpp
+
+  @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+
+  @created 2002-02-27
+  @edited  2005-02-24
+ */
+
+#include "G3D/MeshBuilder.h"
+#include "G3D/MeshAlg.h"
+
+namespace G3D {
+
+void MeshBuilder::setName(const std::string& n) {
+    name = n;
+}
+
+
+void MeshBuilder::commit(std::string& n, Array<int>& indexArray, Array<Vector3>& outvertexArray) {
+    n = name;
+
+    // Make the data fit in a unit cube
+    centerTriList();
+
+    Array<int> toNew, toOld;
+
+    if (close == MeshBuilder::AUTO_WELD) {
+        Array<int> index;
+        MeshAlg::createIndexArray(triList.size(), index);
+        double minEdgeLen, maxEdgeLen, meanEdgeLen, medianEdgeLen;
+        double minFaceArea, maxFaceArea, meanFaceArea, medianFaceArea;
+        MeshAlg::computeAreaStatistics(triList, index,
+            minEdgeLen, meanEdgeLen, medianEdgeLen, maxEdgeLen,
+            minFaceArea, meanFaceArea, medianFaceArea, maxFaceArea);
+        close = minEdgeLen * 0.1;
+    }
+
+    MeshAlg::computeWeld(triList, outvertexArray, toNew, toOld, close);
+
+    // Construct triangles
+    for (int t = 0; t < triList.size(); t += 3) {
+        int index[3];
+
+        for (int i = 0; i < 3; ++i) {
+           index[i] = toNew[t + i];
+        }
+
+        // Throw out zero size triangles
+        if ((index[0] != index[1]) &&
+            (index[1] != index[2]) &&
+            (index[2] != index[0])) {
+            indexArray.append(index[0], index[1], index[2]);
+        }
+    }
+}
+
+
+void MeshBuilder::centerTriList() {
+    // Compute the range of the vertices
+    Vector3 vmin, vmax;
+
+    computeBounds(vmin, vmax);
+
+    Vector3 diagonal = vmax - vmin;
+    double scale = max(max(diagonal.x, diagonal.y), diagonal.z) / 2;
+    debugAssert(scale > 0);
+
+    Vector3 translation = vmin + diagonal / 2;
+
+    // Center and scale all vertices in the input list
+    int v;
+
+    //Matrix3 rot90 = Matrix3::fromAxisAngle(Vector3::UNIT_Y, toRadians(180)) * Matrix3::fromAxisAngle(Vector3::UNIT_X, toRadians(90));
+    for (v = 0; v < triList.size(); ++v) {
+        triList[v] = (triList[v] - translation) / scale;
+        //triList[v] = rot90 * triList[v];
+    }
+}
+
+
+void MeshBuilder::computeBounds(Vector3& min, Vector3& max) {
+    min = Vector3::inf(); 
+    max = -min;
+
+    int v;
+    for (v = 0; v < triList.size(); ++v) {
+        min = min.min(triList[v]);
+        max = max.max(triList[v]);
+    }
+}
+
+
+void MeshBuilder::addTriangle(const Vector3& a, const Vector3& b, const Vector3& c) {
+    triList.append(a, b, c);
+
+	if (_twoSided) {
+	    triList.append(c, b, a);
+	}
+}
+
+
+void MeshBuilder::addQuad(const Vector3& a, const Vector3& b, const Vector3& c, const Vector3& d) {
+    addTriangle(a, b, c);
+    addTriangle(a, c, d);
+}
+
+
+void MeshBuilder::addTriangle(const Triangle& t) {
+	addTriangle(t.vertex(0), t.vertex(1), t.vertex(2));
+}
+
+} // namespace