kicad/3d-viewer/3d_cache/sg/sg_helpers.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015-2017 Cirilo Bernardo <cirilo.bernardo@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <iomanip>
#include <iostream>
#include <map>
#include <sstream>
#include <utility>
#include <wx/log.h>
#include "3d_cache/sg/sg_helpers.h"
#include "3d_cache/sg/sg_node.h"
// formats a floating point number for text output to a VRML file
void S3D::FormatFloat( std::string& result, double value )
{
if( value < 1e-8 && value > -1e-8 )
{
result = "0";
return;
}
// note: many VRML implementations use float so we use the max.
// precision here of 8 digits.
std::ostringstream out;
out << std::setprecision( 8 ) << value;
result = out.str();
size_t p = result.find( '.' );
// trim trailing 0 if appropriate
if( std::string::npos == p )
return;
p = result.find_first_of( "eE" );
if( std::string::npos == p )
{
while( '0' == *(result.rbegin()) )
result.erase( result.size() - 1 );
return;
}
if( '0' != result.at( p -1 ) )
return;
// trim all 0 to the left of 'p'
std::string tmp = result.substr( p );
result = result.substr( 0, p );
while( '0' == *(result.rbegin()) )
result.erase( result.size() - 1 );
result.append( tmp );
return;
}
// format orientation data for VRML output
void S3D::FormatOrientation( std::string& result, const SGVECTOR& axis, double rotation )
{
double aX;
double aY;
double aZ;
axis.GetVector( aX, aY, aZ );
FormatFloat( result, aX );
std::string tmp;
FormatFloat( tmp, aY );
result.append( " " );
result.append( tmp );
FormatFloat( tmp, aZ );
result.append( " " );
result.append( tmp );
FormatFloat( tmp, rotation );
result.append( " " );
result.append( tmp );
return;
}
// format point data for VRML output
void S3D::FormatPoint( std::string& result, const SGPOINT& point )
{
FormatFloat( result, point.x );
std::string tmp;
FormatFloat( tmp, point.y );
result.append( " " );
result.append( tmp );
FormatFloat( tmp, point.z );
result.append( " " );
result.append( tmp );
return;
}
// format vector data for VRML output
void S3D::FormatVector( std::string& result, const SGVECTOR& aVector )
{
double X, Y, Z;
aVector.GetVector( X, Y, Z );
FormatFloat( result, X );
std::string tmp;
FormatFloat( tmp, Y );
result.append( " " );
result.append( tmp );
FormatFloat( tmp, Z );
result.append( " " );
result.append( tmp );
return;
}
// format Color data for VRML output
void S3D::FormatColor( std::string& result, const SGCOLOR& aColor )
{
float R, G, B;
aColor.GetColor( R, G, B );
FormatFloat( result, R );
std::string tmp;
FormatFloat( tmp, G );
result.append( " " );
result.append( tmp );
FormatFloat( tmp, B );
result.append( " " );
result.append( tmp );
return;
}
bool S3D::WritePoint( std::ostream& aFile, const SGPOINT& aPoint )
{
aFile.write( (char*)&aPoint.x, sizeof(aPoint.x) );
aFile.write( (char*)&aPoint.y, sizeof(aPoint.y) );
aFile.write( (char*)&aPoint.z, sizeof(aPoint.z) );
if( aFile.fail() )
return false;
return true;
}
bool S3D::WriteVector( std::ostream& aFile, const SGVECTOR& aVector )
{
double x, y, z;
aVector.GetVector( x, y, z );
aFile.write( (char*)&x, sizeof(double) );
aFile.write( (char*)&y, sizeof(double) );
aFile.write( (char*)&z, sizeof(double) );
if( aFile.fail() )
return false;
return true;
}
bool S3D::WriteColor( std::ostream& aFile, const SGCOLOR& aColor )
{
float r, g, b;
aColor.GetColor( r, g, b );
aFile.write( (char*)&r, sizeof(float) );
aFile.write( (char*)&g, sizeof(float) );
aFile.write( (char*)&b, sizeof(float) );
if( aFile.fail() )
return false;
return true;
}
S3D::SGTYPES S3D::ReadTag( std::istream& aFile, std::string& aName )
{
char schar;
aFile.get( schar );
if( '[' != schar )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] corrupt data; missing left bracket at position ";
ostr << aFile.tellg();
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return S3D::SGTYPE_END;
}
std::string name;
aFile.get( schar );
while( ']' != schar && aFile.good() )
{
name.push_back( schar );
aFile.get( schar );
}
if( schar != ']' )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] corrupt data; could not find right bracket";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return S3D::SGTYPE_END;
}
aName = name;
size_t upos = name.find( '_' );
if( std::string::npos == upos )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] corrupt data; no underscore in name '";
ostr << name << "'";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return S3D::SGTYPE_END;
}
name = name.substr( 0, upos );
S3D::SGTYPES types[S3D::SGTYPE_END] = {
SGTYPE_TRANSFORM,
SGTYPE_APPEARANCE,
SGTYPE_COLORS,
SGTYPE_COLORINDEX,
SGTYPE_FACESET,
SGTYPE_COORDS,
SGTYPE_COORDINDEX,
SGTYPE_NORMALS,
SGTYPE_SHAPE
};
for( int i = 0; i < S3D::SGTYPE_END; ++i )
{
if( !name.compare( S3D::GetNodeTypeName( types[i] ) ) )
return types[i];
}
#ifdef DEBUG
do {
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] corrupt data; no node type matching '";
ostr << name << "'";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
} while( 0 );
#endif
return S3D::SGTYPE_END;
}
bool S3D::ReadPoint( std::istream& aFile, SGPOINT& aPoint )
{
aFile.read( (char*)&aPoint.x, sizeof( aPoint.x ) );
aFile.read( (char*)&aPoint.y, sizeof( aPoint.y ) );
aFile.read( (char*)&aPoint.z, sizeof( aPoint.z ) );
if( aFile.fail() )
return false;
return true;
}
bool S3D::ReadVector( std::istream& aFile, SGVECTOR& aVector )
{
double x, y, z;
aFile.read( (char*)&x, sizeof(double) );
aFile.read( (char*)&y, sizeof(double) );
aFile.read( (char*)&z, sizeof(double) );
aVector.SetVector( x, y, z );
if( aFile.fail() )
return false;
return true;
}
bool S3D::ReadColor( std::istream& aFile, SGCOLOR& aColor )
{
float r, g, b;
aFile.read( (char*)&r, sizeof(float) );
aFile.read( (char*)&g, sizeof(float) );
aFile.read( (char*)&b, sizeof(float) );
aColor.SetColor( r, g, b );
if( aFile.fail() )
return false;
return true;
}
bool S3D::degenerate( glm::dvec3* pts ) noexcept
{
double dx, dy, dz;
dx = pts[1].x - pts[0].x;
dy = pts[1].y - pts[0].y;
dz = pts[1].z - pts[0].z;
if( ( dx*dx + dy*dy + dz*dz ) < 1e-15 )
return true;
dx = pts[2].x - pts[0].x;
dy = pts[2].y - pts[0].y;
dz = pts[2].z - pts[0].z;
if( ( dx*dx + dy*dy + dz*dz ) < 1e-15 )
return true;
dx = pts[2].x - pts[1].x;
dy = pts[2].y - pts[1].y;
dz = pts[2].z - pts[1].z;
if( ( dx*dx + dy*dy + dz*dz ) < 1e-15 )
return true;
return false;
2017-11-02 20:41:29 +00:00
}
static void calcTriad( glm::dvec3* pts, glm::dvec3& tri )
{
if( S3D::degenerate( pts ) )
{
// degenerate points should contribute nothing to the result
tri = glm::dvec3( 0.0, 0.0, 0.0 );
return;
}
// normal * 2 * area
tri = glm::cross( pts[1] - pts[0], pts[2] - pts[0] );
return;
}
bool S3D::CalcTriangleNormals( std::vector< SGPOINT > coords,
std::vector< int >& index, std::vector< SGVECTOR >& norms )
{
size_t vsize = coords.size();
if( vsize < 3 )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] invalid vertex set (fewer than 3 vertices)";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return false;
}
size_t isize = index.size();
if( 0 != isize % 3 || index.empty() )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] invalid index set (not multiple of 3)";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return false;
}
if( !norms.empty() )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] normals set is not empty";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return false;
}
std::map< int, std::list< glm::dvec3 > >vmap;
int p1, p2, p3;
// create the map of indices to facet sets
for( size_t i = 0; i < isize; )
{
p1 = index[i++];
p2 = index[i++];
p3 = index[i++];
if( p1 < 0 || p1 >= (int)vsize || p2 < 0 || p2 >= (int)vsize ||
p3 < 0 || p3 >= (int)vsize )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [INFO] invalid index set; index out of bounds";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return false;
}
glm::dvec3 tri;
glm::dvec3 trip[3];
trip[0] = glm::dvec3( coords[p1].x, coords[p1].y, coords[p1].z );
trip[1] = glm::dvec3( coords[p2].x, coords[p2].y, coords[p2].z );
trip[2] = glm::dvec3( coords[p3].x, coords[p3].y, coords[p3].z );
calcTriad( trip, tri );
std::map< int, std::list< glm::dvec3 > >::iterator ip = vmap.find( p1 );
if( ip != vmap.end() )
{
ip->second.push_back( tri );
}
else
{
vmap.insert( std::pair < int, std::list < glm::dvec3 > >
( p1, std::list < glm::dvec3 >( 1, tri ) ) );
}
ip = vmap.find( p2 );
if( ip != vmap.end() )
{
ip->second.push_back( tri );
}
else
{
vmap.insert( std::pair < int, std::list < glm::dvec3 > >
( p2, std::list < glm::dvec3 >( 1, tri ) ) );
}
ip = vmap.find( p3 );
if( ip != vmap.end() )
{
ip->second.push_back( tri );
}
else
{
vmap.insert( std::pair < int, std::list < glm::dvec3 > >
( p3, std::list < glm::dvec3 >( 1, tri ) ) );
}
}
std::map< int, std::list< glm::dvec3 > >::iterator sM = vmap.begin();
std::map< int, std::list< glm::dvec3 > >::iterator eM = vmap.end();
size_t idx = 0;
while( sM != eM )
{
size_t item = sM->first;
// assign any skipped coordinates a normal of (0,0,1)
while( item > idx )
{
norms.emplace_back( 0, 0, 1 );
++idx;
}
std::list< glm::dvec3 >::iterator sT = sM->second.begin();
std::list< glm::dvec3 >::iterator eT = sM->second.end();
glm::dvec3 norm( 0.0, 0.0, 0.0 );
while( sT != eT )
{
norm += *sT;
++sT;
}
norms.emplace_back( norm.x, norm.y, norm.z );
++idx;
++sM;
}
if( norms.size() != coords.size() )
{
#ifdef DEBUG
std::ostringstream ostr;
ostr << __FILE__ << ": " << __FUNCTION__ << ": " << __LINE__ << "\n";
ostr << " * [BUG] number of normals does not equal number of vertices";
wxLogTrace( MASK_3D_SG, "%s\n", ostr.str().c_str() );
#endif
return false;
}
return true;
}