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FirstHitTRI Class Reference

#include <ray.h>

Inheritance diagram for FirstHitTRI:

List of all members.

Public Methods
	FirstHitTRI ()
bool	SetTreshold (int treshold)
bool	CastNext ()
Protected Methods
float	GetDensity (VECTOR pos)
Protected Attributes
int	m_treshold

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Constructor & Destructor Documentation

FirstHitTRI::FirstHitTRI (    )  [inline]

Definition at line 96 of file ray.h. {m_treshold = 0.0;};

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Member Function Documentation

bool FirstHitTRI::CastNext (    )  [virtual]

berechnet den farbwert eines Strahls indem er das Volumen an diskreten Punkten abtastet, dort einen Dichtewert erhält, ist dieser Dichtewerte größer als ein zuvor gesetztes Minimum so wird dieser zur Farbberechnung herangezogen und kein weiterer Schritt in das volumen getätigt, andernfalls wird im Volumen vorwärts gegangen bis das Ende des Volumens erreicht ist Reimplemented from Trilinear. Reimplemented in MaxIntensityTRI, and XRayTRI. Definition at line 397 of file ray.cpp. References Trilinear::CalcAlphaTrilinear(), Trilinear::CalcColorTrilinear(), GetDensity(), VECTOR::length(), Trilinear::Lighting(), Ray::m_alpha, Ray::m_backgroundcolor, Ray::m_currentcolor, Ray::m_currentpos, Ray::m_data, Ray::m_direction, Ray::m_radius, Ray::m_startpoint, Ray::m_steplength, Ray::m_tf, m_treshold, Ray::mx, Ray::my, Ray::mz, VECTOR::x, VECTOR::y, and VECTOR::z. { if(m_data == NULL) return false; if(m_tf == NULL) return false; int step_count = 0; VECTOR distancetomidpoint = VECTOR(mx/2.0f,my/2.0f,mz/2.0f)-m_currentpos; int steps = (int)((distancetomidpoint.length() + m_radius)/m_steplength); bool first = true; do { if((m_currentpos.x >= 0.0)&&(m_currentpos.y >= 0.0)&&(m_currentpos.z >= 0.0)&&(m_currentpos.x < mx)&&(m_currentpos.y < my)&&(m_currentpos.z < mz)) { if(first) { m_startpoint = VECTOR(m_currentpos.x,m_currentpos.y,m_currentpos.z); first = false; } float d = GetDensity(m_currentpos); if(d > (float)m_treshold) { Color help_color = CalcColorTrilinear(m_currentpos); float help_alpha = CalcAlphaTrilinear(m_currentpos); // lightning: help_color = Lighting(help_color); // calculate new currentcolor: m_currentcolor = help_color; // calculate new alphavalue m_alpha = help_alpha; break; } // calculate new position } m_currentpos += m_steplength*m_direction; step_count++; }while(step_count <= steps); if(m_alpha < 1.0 ) { m_currentcolor += m_backgroundcolor*(1.0f-m_alpha); } return true; }

float FirstHitTRI::GetDensity (  VECTOR    pos )  [protected]

berechnet dichtewert an einer Position im Volumen mit Hilfe trilinearer Interpolation Definition at line 365 of file ray.cpp. References Data::GetDensity(), Ray::m_data, VECTOR::x, VECTOR::y, and VECTOR::z. Referenced by XRayTRI::CastNext(), MaxIntensityTRI::CastNext(), and CastNext(). { int dat000 = m_data->GetDensity(floorf(pos.x),floorf(pos.y),floorf(pos.z)); int dat001 = m_data->GetDensity(floorf(pos.x),floorf(pos.y),ceilf(pos.z)); int dat010 = m_data->GetDensity(floorf(pos.x),ceilf(pos.y),floorf(pos.z)); int dat011 = m_data->GetDensity(floorf(pos.x),ceilf(pos.y),ceilf(pos.z)); int dat100 = m_data->GetDensity(ceilf(pos.x),floorf(pos.y),floorf(pos.z)); int dat101 = m_data->GetDensity(ceilf(pos.x),floorf(pos.y),ceilf(pos.z)); int dat110 = m_data->GetDensity(ceilf(pos.x),ceilf(pos.y),floorf(pos.z)); int dat111 = m_data->GetDensity(ceilf(pos.x),ceilf(pos.y),ceilf(pos.z)); float difX = abs(pos.x - floorf(pos.x)); float difY = abs(pos.y - floorf(pos.y)); float difZ = abs(pos.z - floorf(pos.z)); int datA = dat000*difX + dat100*abs(1.0f-difX); int datB = dat010*difX + dat110*abs(1.0f-difX); int datC = dat011*difX + dat111*abs(1.0f-difX); int datD = dat001*difX + dat101*abs(1.0f-difX); int datE = datA*difZ + datD*abs(1.0f-difZ); int datF = datB*difZ + datC*abs(1.0f-difZ); int dat = datE*difY + datF*abs(1.0f-difY); return dat; }

bool FirstHitTRI::SetTreshold (  int    treshold )  [inline]

Definition at line 97 of file ray.h. { m_treshold = treshold; return true;};

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Member Data Documentation

int FirstHitTRI::m_treshold [protected]

Definition at line 93 of file ray.h. Referenced by CastNext().

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The documentation for this class was generated from the following files:

• ray.h
• ray.cpp

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