1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkIdTypeArray.h"
#include "vtkMath.h"
#include "vtkMathUtilities.h"
#include "vtkNew.h"
#include "vtkPoints.h"
#include "vtkPolygon.h"
#include <type_traits>
// Test ComputeNormal for very large and very small polygons.
int TestPolygonNormalOverflow(int, char*[])
{
int returnValue = EXIT_SUCCESS;
const float scales[] = {
1.0, // for baseline
1e+30, // for overflow test
1e-30, // for underflow test
};
const int nscales = sizeof(scales) / sizeof(*scales);
const float coords[] = {
0.1, 0.1, 0.0, // 0
0.9, 0.0, 0.0, // 1
1.1, 1.1, 0.0, // 2
0.0, 1.2, 0.0, // 3
};
const vtkIdType npoints = sizeof(coords) / (3 * sizeof(*coords));
double baseline[3]{};
vtkNew<vtkIdTypeArray> ids;
vtkNew<vtkPoints> points;
points->SetDataType(VTK_FLOAT);
for (int j = 0; j < nscales; j++)
{
points->SetNumberOfPoints(npoints);
ids->SetNumberOfValues(npoints);
for (vtkIdType i = 0; i < npoints; i++)
{
float point[3];
vtkMath::Assign(&coords[3 * i], point);
vtkMath::MultiplyScalar(point, scales[j]);
points->SetPoint(i, point);
ids->SetValue(i, i);
}
double normal[3];
vtkPolygon::ComputeNormal(ids, points, normal);
if (j == 0)
{
// save the baseline normal
vtkMath::Assign(normal, baseline);
}
else
{
// compare large, small polygon normal against baseline
bool good = true;
for (int k = 0; k < 3; k++)
{
// use float epsilon to check, since polygon point type is float
double rtol = std::numeric_limits<float>::epsilon();
good &= vtkMathUtilities::NearlyEqual(normal[k], baseline[k], rtol);
}
if (!good)
{
std::cerr << "ERROR: Bad normal for polygon scale " << scales[j] << ", expected ";
std::cerr << "(" << baseline[0] << "," << baseline[1] << "," << baseline[2] << "), got ";
std::cerr << "(" << normal[0] << "," << normal[1] << "," << normal[2] << ")." << std::endl;
returnValue = EXIT_FAILURE;
}
}
}
return returnValue;
}
|
