/*
* Create the VBO for the border
* */
void CreateBorderVBO()
{
borderVBO = new VertexBufferObject();
List <TriangleEdge> borderEdges = mesh.GetBorder();
Color4 borderColor = Color4.Pink;
List <RenderVertex> renderVertices = new List <RenderVertex>();
for (int i = 0; i < borderEdges.Count; i++)
{
TriangleEdge edge = borderEdges[i];
Vector3 a = mesh.GetVertex(edge.A);
Vector3 b = mesh.GetVertex(edge.B);
renderVertices.Add(new RenderVertex(a, new Vector3(0, 1, 0), borderColor));
renderVertices.Add(new RenderVertex(b, new Vector3(0, 1, 0), borderColor));
}
borderVBO.Setup(renderVertices, PrimitiveType.Lines);
}
/*
* Vreate the VBO for the normals
* */
void CreateNormalsVBO()
{
normalsVBO = new VertexBufferObject();
List <RenderVertex> renderVertices = new List <RenderVertex>();
float scale = 0.05f;
Color4 normalColor = Color4.DarkGray;
for (int triangleIndex = 0; triangleIndex < mesh.GetNumberOfTriangles(); triangleIndex++)
{
Triangle t = mesh.GetTriangle(triangleIndex);
Vector3 centroid = Vector3.Multiply(
Vector3.Add(mesh.GetVertex(t.GetVertexIndex(0)),
Vector3.Add(mesh.GetVertex(t.GetVertexIndex(1)), mesh.GetVertex(t.GetVertexIndex(2)))), 1.0f / 3.0f);
Vector3 centroid2normal = Vector3.Add(centroid, Vector3.Multiply(t.Normal, scale));
renderVertices.Add(new RenderVertex(centroid, t.Normal, normalColor));
renderVertices.Add(new RenderVertex(centroid2normal, t.Normal, normalColor));
}
normalsVBO.Setup(renderVertices, PrimitiveType.Lines);
}