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/*******************************************************************************
* triangle.h
*
* This module contains all defines, typedefs, and prototypes for TRIANGLE.CPP.
*
* ---------------------------------------------------------------------------
* Persistence of Vision Ray Tracer ('POV-Ray') version 3.7.
* Copyright 1991-2013 Persistence of Vision Raytracer Pty. Ltd.
*
* POV-Ray is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* POV-Ray is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ---------------------------------------------------------------------------
* POV-Ray is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
* ---------------------------------------------------------------------------
* $File: //depot/public/povray/3.x/source/backend/shape/triangle.h $
* $Revision: #1 $
* $Change: 6069 $
* $DateTime: 2013/11/06 11:59:40 $
* $Author: chrisc $
*******************************************************************************/
#ifndef TRIANGLE_H
#define TRIANGLE_H
namespace pov
{
/*****************************************************************************
* Global preprocessor defines
******************************************************************************/
#define TRIANGLE_OBJECT (PATCH_OBJECT)
#define SMOOTH_TRIANGLE_OBJECT (PATCH_OBJECT)
/* NK 1998 double_illuminate - removed +DOUBLE_ILLUMINATE from smooth_triangle */
/*****************************************************************************
* Global typedefs
******************************************************************************/
class Triangle : public ObjectBase
{
public:
VECTOR Normal_Vector;
DBL Distance;
unsigned int Dominant_Axis:2;
unsigned int vAxis:2; /* used only for smooth triangles */
VECTOR P1, P2, P3;
Triangle();
Triangle(int t);
virtual ~Triangle();
virtual ObjectPtr Copy();
virtual bool All_Intersections(const Ray&, IStack&, TraceThreadData *);
virtual bool Inside(const VECTOR, TraceThreadData *) const;
virtual void Normal(VECTOR, Intersection *, TraceThreadData *) const;
// virtual void UVCoord(UV_VECT, const Intersection *, TraceThreadData *) const; // TODO FIXME - why is there no UV-mapping for this trivial object? [trf]
virtual void Translate(const VECTOR, const TRANSFORM *);
virtual void Rotate(const VECTOR, const TRANSFORM *);
virtual void Scale(const VECTOR, const TRANSFORM *);
virtual void Transform(const TRANSFORM *);
virtual void Invert();
virtual void Compute_BBox();
virtual bool Intersect_BBox(BBoxDirection, const BBOX_VECT&, const BBOX_VECT&, BBOX_VAL) const;
virtual bool Compute_Triangle();
protected:
bool Intersect(const Ray& ray, DBL *Depth) const;
void find_triangle_dominant_axis();
};
class SmoothTriangle : public Triangle
{
public:
VECTOR N1, N2, N3, Perp;
SmoothTriangle();
virtual ObjectPtr Copy();
virtual void Normal(VECTOR, Intersection *, TraceThreadData *) const;
virtual void Translate(const VECTOR, const TRANSFORM *);
virtual void Rotate(const VECTOR, const TRANSFORM *);
virtual void Scale(const VECTOR, const TRANSFORM *);
virtual void Transform(const TRANSFORM *);
virtual void Invert();
virtual bool Compute_Triangle();
static DBL Calculate_Smooth_T(const VECTOR IPoint, const VECTOR P1, const VECTOR P2, const VECTOR P3);
protected:
bool Compute_Smooth_Triangle();
};
}
#endif
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