metrics.h

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//
// 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 PXR_USD_USD_GEOM_METRICS_H
#define PXR_USD_USD_GEOM_METRICS_H
 
#include "pxr/pxr.h"
#include "pxr/usd/usdGeom/api.h"
#include "pxr/base/tf/token.h"
#include "pxr/usd/usd/common.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
 
 
USDGEOM_API
TfToken UsdGeomGetStageUpAxis(const UsdStageWeakPtr &stage);
 
USDGEOM_API
bool UsdGeomSetStageUpAxis(const UsdStageWeakPtr &stage, const TfToken &axis);
 
USDGEOM_API
TfToken UsdGeomGetFallbackUpAxis();
 
 
 
 
USDGEOM_API
double UsdGeomGetStageMetersPerUnit(const UsdStageWeakPtr &stage);
 
USDGEOM_API
bool UsdGeomStageHasAuthoredMetersPerUnit(const UsdStageWeakPtr &stage);
 
USDGEOM_API
bool UsdGeomSetStageMetersPerUnit(const UsdStageWeakPtr &stage, 
                                  double metersPerUnit);
 
USDGEOM_API
bool UsdGeomLinearUnitsAre(double authoredUnits, double standardUnits,
                           double epsilon = 1e-5);
 
class UsdGeomLinearUnits {
public:
    static constexpr double nanometers  = 1e-9;
    static constexpr double micrometers = 1e-6;
    static constexpr double millimeters = 0.001;
    static constexpr double centimeters = 0.01;
    static constexpr double meters = 1.0;
    static constexpr double kilometers = 1000;
 
    static constexpr double lightYears = 9.4607304725808e15;
 
    static constexpr double inches = 0.0254;
    static constexpr double feet   = 0.3048;
    static constexpr double yards  = 0.9144;
    static constexpr double miles  = 1609.344;
};
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif // PXR_USD_USD_GEOM_METRICS_H