assimp.assimp/code/StandardShapes.cpp

/*
Open Asset Import Library (ASSIMP)
----------------------------------------------------------------------

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

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with or without modification, are permitted provided that the 
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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither the name of the ASSIMP team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file Implementation of the StandardShapes class
 */
#include "../include/aiTypes.h"
#include "../include/DefaultLogger.h"
#include "../include/aiAssert.h"

#include "StandardShapes.h"

namespace Assimp	{

	// note - flip the face ordering
#define ADD_TRIANGLE(n0,n1,n2) \
	positions.push_back(n2); \
	positions.push_back(n1); \
	positions.push_back(n0);

#ifdef AI_STANDARD_SHAPES_OUTPUT_POLYGONS

#	define ADD_PENTAGON(n0,n1,n2,n3,n4) \
	positions.push_back(n0); \
	positions.push_back(n1); \
	positions.push_back(n2); \
	positions.push_back(n3); \
	positions.push_back(n4); 

#	define ADD_QUAD(n0,n1,n2,n3) \
	positions.push_back(n0); \
	positions.push_back(n1); \
	positions.push_back(n2); \
	positions.push_back(n3); 

#else

#	define ADD_PENTAGON(n0,n1,n2,n3,n4) \
	ADD_TRIANGLE(n0, n1, n2) \
	ADD_TRIANGLE(n0, n2, n3) \
	ADD_TRIANGLE(n0, n3, n4) 

#	define ADD_QUAD(n0,n1,n2,n3) \
	ADD_TRIANGLE(n0, n1, n2) \
	ADD_TRIANGLE(n0, n2, n3) 

#endif

// ------------------------------------------------------------------------------------------------
void Subdivide(std::vector<aiVector3D>& positions)
{
	// assume this to be constant - input must be a Platonic primitive!
	const float fl1 = positions[0].Length();

	unsigned int origSize = (unsigned int)positions.size();
	for (unsigned int i = 0 ; i < origSize ; i+=3)
	{
		aiVector3D& tv0 = positions[i];
		aiVector3D& tv1 = positions[i+1];
		aiVector3D& tv2 = positions[i+2];

		aiVector3D a = tv0, b = tv1, c = tv2;
		aiVector3D v1 = aiVector3D(a.x+b.x, a.y+b.y, a.z+b.z).Normalize()*fl1;
		aiVector3D v2 = aiVector3D(a.x+c.x, a.y+c.y, a.z+c.z).Normalize()*fl1;
		aiVector3D v3 = aiVector3D(b.x+c.x, b.y+c.y, b.z+c.z).Normalize()*fl1;

		tv0 = v1; tv1 = v3; tv2 = v2; // overwrite the original
		ADD_TRIANGLE(v2, v1, a);
		ADD_TRIANGLE(v3, v2, c);
		ADD_TRIANGLE(v1, v3, b);
	}
}


// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeIcosahedron(aiVector3D& center,const aiVector3D& length,
	std::vector<aiVector3D>& positions)
{
	positions.reserve(positions.size()+60);

	const float t = (1.f + 2.236067977f)/2.f;
	const aiVector3D s = aiVector3D( sqrt(1.f + t*t) ) / length;
	
	aiVector3D v0  = aiVector3D(t,1.f, 0.f)/s;
	aiVector3D v1  = aiVector3D(-t,1.f, 0.f)/s;
	aiVector3D v2  = aiVector3D(t,-1.f, 0.f)/s;
	aiVector3D v3  = aiVector3D(-t,-1.f, 0.f)/s;
	aiVector3D v4  = aiVector3D(1.f, 0.f, t)/s;
	aiVector3D v5  = aiVector3D(1.f, 0.f,-t)/s;
	aiVector3D v6  = aiVector3D(-1.f, 0.f,t)/s;
	aiVector3D v7  = aiVector3D(-1.f, 0.f,-t)/s;
	aiVector3D v8  = aiVector3D(0.f, t, 1.f)/s;
	aiVector3D v9  = aiVector3D(0.f,-t, 1.f)/s;
	aiVector3D v10 = aiVector3D(0.f, t,-1.f)/s;
	aiVector3D v11 = aiVector3D(0.f,-t,-1.f)/s;

	ADD_TRIANGLE(v0,v8,v4);
	ADD_TRIANGLE(v0,v5,v10);
	ADD_TRIANGLE(v2,v4,v9);
	ADD_TRIANGLE(v2,v11,v5);

	ADD_TRIANGLE(v1,v6,v8);
	ADD_TRIANGLE(v1,v10,v7);
	ADD_TRIANGLE(v3,v9,v6);
	ADD_TRIANGLE(v3,v7,v11);

	ADD_TRIANGLE(v0,v10,v8);
	ADD_TRIANGLE(v1,v8,v10);
	ADD_TRIANGLE(v2,v9,v11);
	ADD_TRIANGLE(v3,v11,v9);

	ADD_TRIANGLE(v4,v2,v0);
	ADD_TRIANGLE(v5,v0,v2);
	ADD_TRIANGLE(v6,v1,v3);
	ADD_TRIANGLE(v7,v3,v1);

	ADD_TRIANGLE(v8,v6,v4);
	ADD_TRIANGLE(v9,v4,v6);
	ADD_TRIANGLE(v10,v5,v7);
	ADD_TRIANGLE(v11,v7,v5);
}

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeDodecahedron(aiVector3D& center,const aiVector3D& length,
	std::vector<aiVector3D>& positions)
{
	positions.reserve(positions.size()+108);

	const float a = 1.f / 1.7320508f;
	const float b = sqrt((3.f-2.23606797f)/6.f);
	const float c = sqrt((3.f+2.23606797f)/6.f);

	aiVector3D v0  = aiVector3D(a,a,a).SymMul(length);
	aiVector3D v1  = aiVector3D(a,a,-a).SymMul(length);
	aiVector3D v2  = aiVector3D(a,-a,a).SymMul(length);
	aiVector3D v3  = aiVector3D(a,-a,-a).SymMul(length);
	aiVector3D v4  = aiVector3D(-a,a,a).SymMul(length);
	aiVector3D v5  = aiVector3D(-a,a,-a).SymMul(length);
	aiVector3D v6  = aiVector3D(-a,-a,a).SymMul(length);
	aiVector3D v7  = aiVector3D(-a,-a,-a).SymMul(length);
	aiVector3D v8  = aiVector3D(b,c,0.f).SymMul(length);
	aiVector3D v9  = aiVector3D(-b,c,0.f).SymMul(length);
	aiVector3D v10 = aiVector3D(b,-c,0.f).SymMul(length);
	aiVector3D v11 = aiVector3D(-b,-c,0.f).SymMul(length);
	aiVector3D v12 = aiVector3D(c, 0.f, b).SymMul(length);
	aiVector3D v13 = aiVector3D(c, 0.f, -b).SymMul(length);
	aiVector3D v14 = aiVector3D(-c, 0.f, b).SymMul(length);
	aiVector3D v15 = aiVector3D(-c, 0.f, -b).SymMul(length);
	aiVector3D v16 = aiVector3D(0.f, b, c).SymMul(length);
	aiVector3D v17 = aiVector3D(0.f, -b, c).SymMul(length);
	aiVector3D v18 = aiVector3D(0.f, b, -c).SymMul(length);
	aiVector3D v19 = aiVector3D(0.f, -b, -c).SymMul(length);

	ADD_PENTAGON(v0, v8, v9, v4, v16);
	ADD_PENTAGON(v0, v12, v13, v1, v8);
	ADD_PENTAGON(v0, v16, v17, v2, v12);
	ADD_PENTAGON(v8, v1, v18, v5, v9);
	ADD_PENTAGON(v12, v2, v10, v3, v13);
	ADD_PENTAGON(v16, v4, v14, v6, v17);
	ADD_PENTAGON(v9, v5, v15, v14, v4);

	ADD_PENTAGON(v6, v11, v10, v2, v17);
	ADD_PENTAGON(v3, v19, v18, v1, v13);
	ADD_PENTAGON(v7, v15, v5, v18, v19);
	ADD_PENTAGON(v7, v11, v6, v14, v15);
	ADD_PENTAGON(v7, v19, v3, v10, v11);
}

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeOctahedron(aiVector3D& center,const aiVector3D& length,
	std::vector<aiVector3D>& positions)
{
	positions.reserve(positions.size()+24);

	aiVector3D v0  = aiVector3D(length.x, 0.f, 0.f) ;
	aiVector3D v1  = aiVector3D(-length.x, 0.f, 0.f);
	aiVector3D v2  = aiVector3D(0.f, length.y, 0.f);
	aiVector3D v3  = aiVector3D(0.f, -length.y, 0.f);
	aiVector3D v4  = aiVector3D(0.f, 0.f, length.z);
	aiVector3D v5  = aiVector3D(0.f, 0.f, -length.z);

	ADD_TRIANGLE(v4,v0,v2);
	ADD_TRIANGLE(v4,v2,v1);
	ADD_TRIANGLE(v4,v1,v3);
	ADD_TRIANGLE(v4,v3,v0);

	ADD_TRIANGLE(v5,v2,v0);
	ADD_TRIANGLE(v5,v1,v2);
	ADD_TRIANGLE(v5,v3,v1);
	ADD_TRIANGLE(v5,v0,v3);
}

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeTetrahedron(aiVector3D& center,const aiVector3D& length,
	std::vector<aiVector3D>& positions)
{
	positions.reserve(positions.size()+9);

	const float a = 1.41421f/3.f;
	const float b = 2.4494f/3.f;

	aiVector3D v0  = aiVector3D(0.f,0.f,1.f).SymMul(length);
	aiVector3D v1  = aiVector3D(2*a,0,-1.f/3.f).SymMul(length);
	aiVector3D v2  = aiVector3D(-a,b,-1.f/3.f).SymMul(length);
	aiVector3D v3  = aiVector3D(-a,-b,-1.f/3.f).SymMul(length);

	ADD_TRIANGLE(v0,v1,v2);
	ADD_TRIANGLE(v0,v2,v3);
	ADD_TRIANGLE(v0,v3,v1);
	ADD_TRIANGLE(v1,v3,v2);
}

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeHexahedron(aiVector3D& center,const aiVector3D& length,
	std::vector<aiVector3D>& positions)
{
	positions.reserve(positions.size()+36);
	aiVector3D _length = length * (1.f/1.73205080f);

	aiVector3D v0  = aiVector3D(-1.f,-1.f,-1.f).SymMul(_length) ;
	aiVector3D v1  = aiVector3D(1.f,-1.f,-1.f).SymMul(_length)  ;
	aiVector3D v2  = aiVector3D(1.f,1.f,-1.f) .SymMul(_length) ;
	aiVector3D v3  = aiVector3D(-1.f,1.f,-1.f) .SymMul(_length) ;
	aiVector3D v4  = aiVector3D(-1.f,-1.f,1.f) .SymMul(_length) ;
	aiVector3D v5  = aiVector3D(1.f,-1.f,1.f) .SymMul(_length) ;
	aiVector3D v6  = aiVector3D(1.f,1.f,1.f) .SymMul(_length) ;
	aiVector3D v7  = aiVector3D(-1.f,1.f,1.f) .SymMul(_length) ;

	ADD_QUAD(v0,v3,v2,v1);
	ADD_QUAD(v0,v1,v5,v4);
	ADD_QUAD(v0,v4,v7,v3);
	ADD_QUAD(v6,v5,v1,v2);
	ADD_QUAD(v6,v2,v3,v7);
	ADD_QUAD(v6,v7,v4,v5);
}

#undef ADD_TRIANGLE

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeSphere(
	aiVector3D&		center,
	float			radius,
	unsigned int	tess,
	std::vector<aiVector3D>& positions)
{
	MakeIcosahedron(center,radius,positions);

	for (unsigned int i = 0; i<tess;++i)
		Subdivide(positions);
}

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeCone(
	aiVector3D&		center1,
	float			radius1,
	aiVector3D&		center2,
	float			radius2,
	unsigned int	tess, 
	std::vector<aiVector3D>& positions, 
	bool bOpened /*= false*/)
{
}

// ------------------------------------------------------------------------------------------------
void StandardShapes::MakeCircle(
	aiVector3D&		center, 
	aiVector3D&		normal, 
	float			radius,
	unsigned int	tess,
	std::vector<aiVector3D>& positions)
{
}

} // ! Assimp