// This code is in the public domain -- castanyo@yahoo.es

#include "TriMesh.h"

using namespace nv;


/// Triangle mesh.
Vector3 TriMesh::faceNormal(uint f) const
{
	const Face & face = this->faceAt(f);
	const Vector3 & p0 = this->vertexAt(face.v[0]).pos;
	const Vector3 & p1 = this->vertexAt(face.v[1]).pos;
	const Vector3 & p2 = this->vertexAt(face.v[2]).pos;
	return normalizeSafe(cross(p1 - p0, p2 - p0), Vector3(zero), 0.0f);
}

/// Get face vertex.
const TriMesh::Vertex & TriMesh::faceVertex(uint f, uint v) const
{
	nvDebugCheck(v < 3);
	const Face & face = this->faceAt(f);
	return this->vertexAt(face.v[v]);
}

