vl::fvec3 CoreFunctions::getNewPointPosition(vl::fvec3 pPoint1, vl::fvec3 pPoint2, float pValueX)
{
float maxDistance;
float partDistance;
float multiplier;
float valueY;
float valueZ;
if (pPoint1.x() > pPoint2.x())
{
vl::fvec3 tmpPoint = pPoint1;
pPoint1 = pPoint2;
pPoint2 = tmpPoint;
}
maxDistance = computeDistance(pPoint1.x(), pPoint2.x());
partDistance = computeDistance(pPoint1.x(), pValueX);
multiplier = partDistance / maxDistance;
maxDistance = computeDistance(pPoint1.y(), pPoint2.y());
partDistance = maxDistance * multiplier;
if (pPoint1.y() < pPoint2.y())
{
valueY = pPoint1.y() + partDistance;
}
else
{
valueY = pPoint1.y() - partDistance;
}
maxDistance = computeDistance(pPoint1.z(), pPoint2.z());
partDistance = maxDistance * multiplier;
if (pPoint1.z() < pPoint2.z())
{
valueZ = pPoint1.z() + partDistance;
}
else
{
valueZ = pPoint1.z() - partDistance;
}
return vl::fvec3(pValueX, valueY, valueZ);
}
void init_LUMINANCE_UBYTE(
vl::Actor* actor,
vl::Image* img,
vl::fvec3 scale = vl::fvec3(10.0f, 10, 10.0f),
int threshold_min = 32,
int threshold_max = 255,
const TF& transfer_func = TransferRGBA_255() )
{
if (img->type() != vl::IT_UNSIGNED_BYTE || img->format() != vl::IF_LUMINANCE)
{
vl::Log::error("init_LUMINANCE_UBYTE() error:\n" + img->print() );
return;
}
vl::ref<vl::Geometry> geometry;
vl::ref<vl::ArrayFloat3> points;
vl::ref<vl::DrawElementsUInt> draw_elements;
vl::ref<vl::ArrayFloat3> eye_space_points;
eye_space_points = new vl::ArrayFloat3;
geometry = new vl::Geometry;
points = new vl::ArrayFloat3;
vl::ref<vl::ArrayFloat3> norms = new vl::ArrayFloat3;
draw_elements = new vl::DrawElementsUInt(vl::PT_POINTS);
vl::ref<vl::ArrayUByte4> color = new vl::ArrayUByte4;
geometry->setVertexArray( points.get() );
geometry->setNormalArray( norms.get() );
geometry->setColorArray( color.get() );
geometry->drawCalls()->push_back( draw_elements.get() );
int point_count = 0;
for(int index = 0, z=0; z<img->depth(); ++z)
{
for(int y=0; y<img->height(); ++y)
{
for(int x=0; x<img->width(); ++x, ++index)
{
int val = img->pixels()[ x + y*img->pitch() + z*img->height()*img->pitch() ];
if ( val >= threshold_min && val <= threshold_max)
++point_count;
}
}
}
#ifndef NDEBUG
vl::Log::print(vl::Say("original points = %6.0nK\n") << img->depth() * img->height() * img->width() / 1000.0f );
vl::Log::print(vl::Say("accepted points = %6.0nK\n") << point_count / 1000.0f);
vl::Log::print(vl::Say("simplif. ratio = %n%%\n") << (1.0f - (float)point_count / (img->depth() * img->height() * img->width())) * 100.0f );
#endif
points->resize( point_count );
norms->resize( point_count );
draw_elements->indexBuffer()->resize( point_count );
color->resize( point_count );
for(int index = 0, z=0; z<img->depth(); ++z)
{
for(int y=0; y<img->height(); ++y)
{
for(int x=0; x<img->width(); ++x)
{
int val = img->pixels()[ x + y*img->pitch() + z*img->height()*img->pitch() ];
if ( val >= threshold_min && val <= threshold_max)
{
float tx = (float)x / ( img->width() -1 );
float ty = (float)y / ( img->height()-1 );
float tz = (float)z / ( img->depth() -1 );
points->at(index) = vl::fvec3(tx*scale.x() - scale.x()*0.5f, ty*scale.y() - scale.y()*0.5f, tz*scale.z() - scale.z()*0.5f);
// compute normal
int x1 = x-1;
int x2 = x+1;
int y1 = y-1;
int y2 = y+1;
int z1 = z-1;
int z2 = z+1;
x2 = x2 > img->width() -1 ? img->width() -1 : x2;
y2 = y2 > img->height() -1 ? img->height()-1 : y2;
z2 = z2 > img->depth() -1 ? img->depth() -1 : z2;
x1 = x1 < 0 ? 0 : x1;
y1 = y1 < 0 ? 0 : y1;
z1 = z1 < 0 ? 0 : z1;
float vx1 = img->pixels()[ x1 + y*img->pitch() + z*img->height()*img->pitch() ];
float vx2 = img->pixels()[ x2 + y*img->pitch() + z*img->height()*img->pitch() ];
float vy1 = img->pixels()[ x + y1*img->pitch() + z*img->height()*img->pitch() ];
float vy2 = img->pixels()[ x + y2*img->pitch() + z*img->height()*img->pitch() ];
float vz1 = img->pixels()[ x + y*img->pitch() + z1*img->height()*img->pitch() ];
float vz2 = img->pixels()[ x + y*img->pitch() + z2*img->height()*img->pitch() ];
vl::fvec3 normal(vx1-vx2, vy1-vy2, vz1-vz2);
normal.normalize();
norms->at(index) = normal;
unsigned char r=0,g=0,b=0,a=0;
transfer_func(img->pixels()[x + y*img->pitch() + z*img->height()*img->pitch()], r,g,b,a);
color->at(index) = vl::ubvec4(r,g,b,a);
draw_elements->indexBuffer()->at(index) = index;
++index;
}
}
}
}
actor->setLod(0, geometry.get());
geometry->setDisplayListEnabled(false);
geometry->setBufferObjectEnabled(true);
if (vl::Has_GL_ARB_vertex_buffer_object)
{
color->bufferObject()->setBufferData(vl::BU_STATIC_DRAW);
points->bufferObject()->setBufferData(vl::BU_STATIC_DRAW);
norms->bufferObject()->setBufferData(vl::BU_STATIC_DRAW);
draw_elements->indexBuffer()->bufferObject()->setBufferData(vl::BU_DYNAMIC_DRAW);
}
eye_space_points->resize( points->size() );
}