void TriangleMesh::Updata_Object_Area ()
{
area = 0;
for ( size_t i = 0; i < num_of_triangle; i++ )
area += GetTriangleArea( i );
// return area;
}
static Vec3 BarycentricInterpolation (const Vec3& vertex0, const Vec3& vertex1, const Vec3& vertex2,
const Vec3& value0, const Vec3& value1, const Vec3& value2,
const Vec3& interpolationVertex)
{
double edge0 = Distance (vertex0, vertex1);
double edge1 = Distance (vertex1, vertex2);
double edge2 = Distance (vertex2, vertex0);
double distance0 = Distance (vertex0, interpolationVertex);
double distance1 = Distance (vertex1, interpolationVertex);
double distance2 = Distance (vertex2, interpolationVertex);
double area = GetTriangleArea (edge0, edge1, edge2);
if (IsZero (area)) {
return value0;
}
double area0 = GetTriangleArea (edge0, distance0, distance1);
double area1 = GetTriangleArea (edge1, distance1, distance2);
double area2 = GetTriangleArea (edge2, distance0, distance2);
Vec3 interpolated = (value0 * area1 + value1 * area2 + value2 * area0) / area;
return interpolated;
}