forked from PixarAnimationStudios/OpenUSD
-
Notifications
You must be signed in to change notification settings - Fork 0
/
homogeneous.h
79 lines (68 loc) · 2.73 KB
/
homogeneous.h
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
//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef GF_HOMOGENEOUS_H
#define GF_HOMOGENEOUS_H
/// \file gf/homogeneous.h
/// \ingroup group_gf_LinearAlgebra
/// Utility functions for GfVec4f and GfVec4d as homogeneous vectors
#include "pxr/pxr.h"
#include "pxr/base/gf/vec3d.h"
#include "pxr/base/gf/vec3f.h"
#include "pxr/base/gf/vec4d.h"
#include "pxr/base/gf/vec4f.h"
#include "pxr/base/gf/api.h"
PXR_NAMESPACE_OPEN_SCOPE
/// Returns a vector which is \p v homogenized. If the fourth element of \p v
/// is 0, it is set to 1.
/// \ingroup group_gf_LinearAlgebra
GF_API
GfVec4f GfGetHomogenized(const GfVec4f &v);
/// Homogenizes \p a and \p b and then performs the cross product on the first
/// three elements of each. Returns the cross product as a homogenized
/// vector.
/// \ingroup group_gf_LinearAlgebra
GF_API
GfVec4f GfHomogeneousCross(const GfVec4f &a, const GfVec4f &b);
GF_API
GfVec4d GfGetHomogenized(const GfVec4d &v);
/// Homogenizes \p a and \p b and then performs the cross product on the first
/// three elements of each. Returns the cross product as a homogenized
/// vector.
/// \ingroup group_gf_LinearAlgebra
GF_API
GfVec4d GfHomogeneousCross(const GfVec4d &a, const GfVec4d &b);
/// Projects homogeneous \p v into Euclidean space and returns the result as a
/// Vec3f.
inline GfVec3f GfProject(const GfVec4f &v) {
float inv = (v[3] != 0.0f) ? 1.0f/v[3] : 1.0f;
return GfVec3f(inv * v[0], inv * v[1], inv * v[2]);
}
/// Projects homogeneous \p v into Euclidean space and returns the result as a
/// Vec3d.
inline GfVec3d GfProject(const GfVec4d &v) {
double inv = (v[3] != 0.0) ? 1.0/v[3] : 1.0;
return GfVec3d(inv * v[0], inv * v[1], inv * v[2]);
}
PXR_NAMESPACE_CLOSE_SCOPE
#endif /* GF_HOMOGENEOUS_H */