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/*
* Copyright (c) 2008-2017, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA CORPORATION and its licensors retain all intellectual property
* and proprietary rights in and to this software, related documentation
* and any modifications thereto. Any use, reproduction, disclosure or
* distribution of this software and related documentation without an express
* license agreement from NVIDIA CORPORATION is strictly prohibited.
*/
#ifndef SPLINE_H
#define SPLINE_H
/** @file spline.h
* @brief A utility class to manage 3d spline curves.
*
* This is used heavily by the terrain terraforming tools for roads, lakes, and flatten operations.
*
* @author John W. Ratcliff
*/
/** @file spline.cpp
* @brief A utility class to manage 3d spline curves.
*
* This is used heavily by the terrain terraforming tools for roads, lakes, and flatten operations.
*
* @author John W. Ratcliff
*/
#include "PsArray.h"
#include "PsUserAllocated.h"
#include "PxVec3.h"
#include "ApexUsingNamespace.h"
class SplineNode
{
public:
float GetY(void) const
{
return y;
};
float x; // time/distance x-axis component.
float y; // y component.
float u;
float p;
};
typedef nvidia::Array< SplineNode > SplineNodeVector;
typedef nvidia::Array< physx::PxVec3 > PxVec3Vector;
typedef nvidia::Array< uint32_t > uint32_tVector;
class Spline : public nvidia::UserAllocated
{
public:
void Reserve(int32_t size)
{
mNodes.reserve((uint32_t)size);
};
void AddNode(float x,float y);
void ComputeSpline(void);
float Evaluate(float x,uint32_t &index,float &fraction) const; // evaluate Y component based on X
int32_t GetSize(void) const
{
return (int32_t)mNodes.size();
}
float GetEntry(int32_t i) const
{
return mNodes[(uint32_t)i].GetY();
};
void Clear(void)
{
mNodes.clear();
};
private:
SplineNodeVector mNodes; // nodes.
};
class SplineCurve : public nvidia::UserAllocated
{
public:
void Reserve(int32_t size)
{
mXaxis.Reserve(size);
mYaxis.Reserve(size);
mZaxis.Reserve(size);
};
void setControlPoints(const PxVec3Vector &points)
{
Clear();
Reserve( (int32_t)points.size() );
for (uint32_t i=0; i<points.size(); i++)
{
AddControlPoint(points[i]);
}
ComputeSpline();
}
float AddControlPoint(const physx::PxVec3& p); // add control point, time is computed based on distance along the curve.
void AddControlPoint(const physx::PxVec3& p,float t); // add control point.
void GetPointOnSpline(float t,physx::PxVec3 &pos)
{
float d = t*mTime;
uint32_t index;
float fraction;
pos = Evaluate(d,index,fraction);
}
physx::PxVec3 Evaluate(float dist,uint32_t &index,float &fraction);
float GetLength(void) { return mTime; }; //total length of spline
int32_t GetSize(void) { return mXaxis.GetSize(); };
physx::PxVec3 GetEntry(int32_t i);
void ComputeSpline(void); // compute spline.
void Clear(void)
{
mXaxis.Clear();
mYaxis.Clear();
mZaxis.Clear();
mTime = 0;
};
float Set(const PxVec3Vector &vlist)
{
Clear();
int32_t count = (int32_t)vlist.size();
Reserve(count);
for (uint32_t i=0; i<vlist.size(); i++)
{
AddControlPoint( vlist[i] );
}
ComputeSpline();
return mTime;
};
void ResampleControlPoints(const PxVec3Vector &inputpoints,
PxVec3Vector &outputpoints,
uint32_tVector &outputIndex,
float dtime)
{
float length = Set(inputpoints);
for (float l=0; l<=length; l+=dtime)
{
uint32_t index;
float fraction;
physx::PxVec3 pos = Evaluate(l,index,fraction);
outputpoints.pushBack(pos);
outputIndex.pushBack(index);
}
};
private:
float mTime; // time/distance traveled.
Spline mXaxis;
Spline mYaxis;
Spline mZaxis;
};
#endif
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