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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#ifndef RAYTRACER_H
#define RAYTRACER_H
#include "Wm5Vector3.h"
using namespace Wm5;
class RayTracer
{
public:
typedef float (*Function)(const Vector3f&);
typedef Vector3f (*Gradient)(const Vector3f&);
// Construction and destruction. Ray trace the level surface F(X) = 0.
// The surface normals are computed from DF(X), the gradient of F.
RayTracer (Function F, Gradient DF, int width, int height);
~RayTracer ();
// Camera and view frustum parameters.
Vector3f Location, DVector, UVector, RVector;
float Near, Far, HalfWidth, HalfHeight;
// Access to the rendered image.
inline int GetWidth () const;
inline int GetHeight () const;
inline const float* GetImage () const;
// Ray trace the view frustum region. The tracing uses a single
// directional light. TODO: Allow more lights and different light types.
// The number of samples per ray for computing intersection of rays with
// the surface is specified by numSamples..
void DrawSurface (int numSamples, const Vector3f& lightDirection,
bool blur);
// Bisection parameters.
float Epsilon; // default = 1.0e-4f
int MaxBisectSteps; // default = 8
private:
// Find the intersection of a ray with the surface.
void FindSurface (float s0, float f0, const Vector3f& pos0, float s1,
float f1, const Vector3f& pos1, const Vector3f& rayDirection,
Vector3f& surfacePosition, Vector3f& surfaceNormal);
// Blur the image for a cheap antialiasing.
void BlurImage ();
// The function F and its gradient DF.
Function mFunction;
Gradient mGradient;
// The rendered image.
int mWidth, mHeight;
float* mImage;
float* mBlurredImage;
};
#include "RayTracer.inl"
#endif
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