Changeset 1768 for GTP/trunk/Lib/Vis/Preprocessing/src/Mesh.cpp

Timestamp:

11/20/06 09:15:28 (18 years ago)

Author:

mattausch

Message:

 

File:

• GTP/trunk/Lib/Vis/Preprocessing/src/Mesh.cpp (modified) (1 diff)

GTP/trunk/Lib/Vis/Preprocessing/src/Mesh.cpp

@@ -797 +797 @@
 int MeshInstance::GetRandomEdgePoint(Vector3 &point, Vector3 &normal)
 {
-        // TODO
-        return mMesh->GetRandomSurfacePoint(point, normal);
+        // get random face
+        const int faceIdx = (int)RandomValue(0.0f, (float)mMesh->mFaces.size() - 0.5f);
+        Face *face = mMesh->mFaces[faceIdx];
+
+        // get random edge of face (hack: this is not uniform in the edges!
+        const int edgeIdx = (int)RandomValue(0.0f, face->mVertexIndices.size() - 0.5f);
+
+        const int vertexIdxA = face->mVertexIndices[edgeIdx];
+        const int vertexIdxB = face->mVertexIndices[(edgeIdx + 1) % (int)face->mVertexIndices.size()];
+
+        const Vector3 a = mMesh->mVertices[vertexIdxA];
+        const Vector3 b = mMesh->mVertices[vertexIdxB];
+
+        const float w = RandomValue(0.0f, 1.0f);
+
+        // get random point on edge
+        point = a * w + b * (1.0f - w);
+
+        // hack: set normal of face as normal
+        normal = mMesh->GetFacePlane(faceIdx).mNormal;
+
+    return 1;
 }