#include <ray.h>
Inheritance diagram for FirstHitNN:
Public Methods | |
| FirstHitNN () | |
| bool | SetTreshold (int treshold) |
| virtual bool | CastNext () |
Protected Attributes | |
| int | m_treshold |
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Definition at line 86 of file ray.h.
00086 {m_treshold = 0.0;};
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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 Ray. Definition at line 324 of file ray.cpp. References Data::GetDensity(), Transfunc::GetDensityColor(), Transfunc::GetOpacity(), VECTOR::length(), Ray::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, ROUND, VECTOR::x, VECTOR::y, and VECTOR::z.
00324 {
00325
00326 if(m_data == NULL) return false;
00327 if(m_tf == NULL) return false;
00328
00329 int step_count = 0;
00330 bool first = true;
00331 VECTOR distancetomidpoint = VECTOR(mx/2.0f,my/2.0f,mz/2.0f)-m_currentpos;
00332 int steps = (int)((distancetomidpoint.length() + m_radius)/m_steplength);
00333 do {
00334
00335 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)) {
00336 if(first) {
00337 m_startpoint = VECTOR(m_currentpos.x,m_currentpos.y,m_currentpos.z);
00338 first = false;
00339 }
00340 int d = m_data->GetDensity((int)ROUND(m_currentpos.x),(int)ROUND(m_currentpos.y),(int)ROUND(m_currentpos.z));
00341 if(d > m_treshold) {
00342 Color help_color = m_tf->GetDensityColor(d);
00343 float help_alpha = m_tf->GetOpacity(d);
00344 // lightning:
00345 help_color = Lighting(help_color);
00346 // calculate new currentcolor:
00347 m_currentcolor = help_color;
00348 // calculate new alphavalue
00349 m_alpha = help_alpha;
00350 break;
00351 }
00352 }
00353 // calculate new position
00354 m_currentpos += m_steplength*m_direction;
00355
00356 step_count++;
00357 }while(step_count <= steps);
00358 if(m_alpha < 1.0 ) m_currentcolor += m_backgroundcolor*(1.0 - m_alpha);
00359 return true;
00360 }
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Definition at line 87 of file ray.h.
00087 { m_treshold = treshold; return true;};
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Definition at line 84 of file ray.h. Referenced by CastNext(). |
1.3-rc2