C++ (Cpp) Triangle::setNormal示例

示例#1

文件： MeshSweeper.cpp 项目： elitonperin/RayTrace

TriangleMeshShape*
	MeshSweeper::makeCone(const Polyline& circle, const Vec3& path, bool flat)
//[]----------------------------------------------------[]
//|  Make cone                                       |
//[]----------------------------------------------------[]
{
	int np = circle.getNumberOfVertices();
	int nv = np *2; // number of vertices
	int nb = np - 2; // number of triangles of the base
	int nt = np + nb; // number of triangles
	TriangleMesh::Arrays data;
	
	data.vertices = new Vec3[data.numberOfVertices = nv];
	data.normals = new Vec3[data.numberOfNormals = np + 2];
	data.triangles = new TriangleMesh::Triangle[data.numberOfTriangles = nt];

	Vec3 c(0, 0, 0);

	if (true)
	{
		Polyline::VertexIterator vit(circle.getVertexIterator());

		for (int i = 0; i < np; i++)
		{
			const Vec3 p = vit++.position;
			data.vertices[i] = p;
			c+=p;
		}

		c *= Math::inverse<REAL>((REAL)np);
		
		// Adiciona vértice superior do cone
		data.vertices[np+1] =  path + data.vertices[np].normalize();

	}

	if (true)
	{
		Vec3 N = triangleNormal(data.vertices);

		data.normals[np] = N;
		data.normals[np+1] = -N;
	}

	TriangleMesh::Triangle* triangle = data.triangles;

	int npm = np + 1;

	for (int i = 0; i < np; i++)
	{
		int k = (i + 1) % np;
		triangle->setVertices(i, npm, k);

		if (flat)
		{
		  data.normals[i] = triangleNormal(data.vertices, i, npm, k);
		  triangle->setNormal(i);
		}
		else
		{
		  data.normals[i] = (data.vertices[i + np] - c).versor();
		  triangle->setNormals(i, i, k);
		}

		triangle++;
	}

	int v0 = 0;
	int v1 = 1;
	int v2 = 2;

	int aux = np - 2;

	for (int i = 0; i < aux; i++)
	{
		triangle->setVertices(v0, v1, v2);
		triangle->setNormal(np);
		triangle++;
		v1 = (v1+1) % np;
		v2 = (v2+1) % np;
	}

	return new TriangleMeshShape(data);

}

示例#2

文件： MeshSweeper.cpp 项目： elitonperin/RayTrace

TriangleMeshShape*
MeshSweeper::makeCylinder(const Polyline& circle, const Vec3& path, bool flat)
//[]----------------------------------------------------[]
//|  Make cylinder                                       |
//[]----------------------------------------------------[]
{
  int np = circle.getNumberOfVertices();
  int nv = np * 2; // number of vertices
  int nb = np - 2; // number of triangles of the base
  int nt = nv + 2 * nb; // number of triangles
  TriangleMesh::Arrays data;

  data.vertices = new Vec3[data.numberOfVertices = nv];
  data.normals = new Vec3[data.numberOfNormals = np + 2];
  data.triangles = new TriangleMesh::Triangle[data.numberOfTriangles = nt];

  Vec3 c(0, 0, 0);

  if (true)
  {
    Polyline::VertexIterator vit(circle.getVertexIterator());

    for (int i = 0; i < np; i++)
    {
      const Vec3 p = vit++.position;

      c += p;
      data.vertices[i + np] = p;
      data.vertices[i] = p + path;
    }
    c *= Math::inverse<REAL>((REAL)np);
  }
  if (true)
  {
    Vec3 N = triangleNormal(data.vertices); // base normal

    data.normals[np] = N;
    data.normals[np + 1] = -N;
  }

  TriangleMesh::Triangle* triangle = data.triangles;

  for (int i = 0; i < np; i++)
  {
    int j = (i + np);
    int k = (i + 1) % np;

    triangle->setVertices(i, j, k);
    triangle[1].setVertices(j, k + np, k);
    if (flat)
    {
      data.normals[i] = triangleNormal(data.vertices, i, j, k);
      triangle->setNormal(i);
      triangle[1].setNormal(i);
    }
    else
    {
      data.normals[i] = (data.vertices[i + np] - c).versor();
      triangle->setNormals(i, i, k);
      triangle[1].setNormals(i, k, k);
    }
    triangle += 2;
  }

  int v0 = 0;
  int v1 = 1;
  int v2 = 2;

  for (int i = 0; i < nb; i++)
  {
    triangle->setVertices(v0, v1, v2);
    triangle[nb].setVertices(v0 + np, v2 + np, v1 + np);
    triangle->setNormal(np);
    triangle[nb].setNormal(np + 1);
    triangle++;
    //v2 = ((v1 = (v0 = v2) + 1) + 1) % np;
	v1 = (v1+1) % np;
	v2 = (v2+1) % np;
  }
  return new TriangleMeshShape(data);
}