assimp/code/StandardShapes.cpp

<EFBFBD><EFBFBD>/*
Open Asset Import Library (ASSIMP)
----------------------------------------------------------------------

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

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* Redistributions of source code must retain the above
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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* Neither the name of the ASSIMP team, nor the names of its
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  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	{

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

// ------------------------------------------------------------------------------------------------
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(a, v1, v2);
		ADD_TRIANGLE(c, v2, v3);
		ADD_TRIANGLE(b, v3, v1);
	}
}


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

	const float t = (1.f + 2.236067977f)/2.f;
	const float s = 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,float length,
	std::vector<aiVector3D>& positions)
{
	positions.reserve(positions.size()+60);

}

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

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

	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);
}

#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