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kugeltabellen.cpp
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kugeltabellen.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <math.h>
#include "kugeltabellen.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
GLint calc_ind2(GLint b, GLint c, GLint Aufloesung) {
return ((c*(2*Aufloesung+3-c))/2)+b;
}
void Dreieck(GLfloat ax, GLfloat ay, GLfloat az,
GLfloat bx, GLfloat by, GLfloat bz,
GLfloat cx, GLfloat cy, GLfloat cz,
GLint Aufloesung, GLint &iv, GLint &ii, GLint &it,
GLfloat *vertices,GLint *indices,GLfloat *texcoord) {
GLint c=0,b=0;
GLfloat orient=99;
GLint ivstart=iv/3;
for (c=0;c<=Aufloesung;c++) {
for (b=0;b<=Aufloesung-c;b++) {
GLfloat temp_x=ax+((b+0.0)/(Aufloesung+0.0))*(bx-ax)+((c+0.0)/(Aufloesung+0.0))*(cx-ax);
GLfloat temp_y=ay+((b+0.0)/(Aufloesung+0.0))*(by-ay)+((c+0.0)/(Aufloesung+0.0))*(cy-ay);
GLfloat temp_z=az+((b+0.0)/(Aufloesung+0.0))*(bz-az)+((c+0.0)/(Aufloesung+0.0))*(cz-az);
GLfloat Abstand=sqrt(temp_x*temp_x+temp_y*temp_y+temp_z*temp_z);
temp_x=temp_x/Abstand;
temp_y=temp_y/Abstand;
temp_z=temp_z/Abstand;
vertices[iv++]=temp_x;
vertices[iv++]=temp_y;
vertices[iv++]=temp_z;
GLfloat winkel=atan(temp_x/temp_y)/M_PI;
if (temp_x==0 && temp_y==0) winkel=orient;
if (!winkel) winkel=0;
if (temp_y<0) winkel+=1;
else if (temp_x<0) winkel+=2;
if (orient!=99) {
while (winkel<orient-.5) {winkel+=1;}
while (winkel>orient+.5) {winkel-=1;}
}
orient=winkel;
texcoord[it++]=winkel;
texcoord[it++]=acos(temp_z)/M_PI-1;
}
}
for (c=0;c<Aufloesung;c++) {
for (b=0;b<Aufloesung-c;b++) {
if (c!=0) {
indices[ii++]=ivstart+calc_ind2(b,c,Aufloesung);
indices[ii++]=ivstart+calc_ind2(b+1,c-1,Aufloesung);
indices[ii++]=ivstart+calc_ind2(b+1,c,Aufloesung);
}
indices[ii++]=ivstart+calc_ind2(b,c,Aufloesung);
indices[ii++]=ivstart+calc_ind2(b+1,c,Aufloesung);
indices[ii++]=ivstart+calc_ind2(b,c+1,Aufloesung);
}
}
}
void initialisiereKugelTabellen(GLint Aufloesung) {
if (Aufloesung<1) Aufloesung=1;
if (Aufloesung>29) Aufloesung=29;
/*
GLfloat a=atan(1/1)/M_PI;
GLfloat b=atan(-1/1)/M_PI;
GLfloat c=atan(-1/-1)/M_PI;
GLfloat d=atan(1/-1)/M_PI;
printf("%f %f %f %f\n",a,b,c,d);
*/
for (GLint A=1;A<=Aufloesung;A++) {
if (!ball_vertices[A]&& (A%2)) {
//printf("%i ",A);fflush(stdout);
ball_vertices[A] = (GLfloat*) malloc (20*3*(A+1)*(A+2)*sizeof(GLfloat)/2);
ball_indices[A] = (GLint*) malloc (20*3*A*A*sizeof(GLint));
ball_texcoord[A] = (GLfloat*) malloc (20*(A+1)*(A+2)*sizeof(GLfloat));
GLfloat a=sqrt(.8); // 0.8944271
GLfloat b=sqrt(.2); // 0.4472136
GLfloat c=a*sin(.4*M_PI); // 0.8506508
GLfloat d=a*cos(.4*M_PI); // 0.2763932
GLfloat e=a*sin(.8*M_PI); // 0.5257311
GLfloat f=a*cos(.8*M_PI); // 0.7236068
GLint iv=0,ii=0,it=0;
Dreieck(a,0,b,d,c,b,0,0,1,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//1
Dreieck(d,c,b,f,e,b,0,0,1,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//2
Dreieck(f,e,b,f,-e,b,0,0,1,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//3
Dreieck(f,-e,b,d,-c,b,0,0,1,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//4
Dreieck(d,-c,b,a,0,b,0,0,1,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//5
Dreieck(-f,-e,-b,-f,e,-b,a,0,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//6
Dreieck(a,0,b,-f,e,-b,d,c,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//7
Dreieck(-f,e,-b,-d,c,-b,d,c,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//8
Dreieck(d,c,b,-d,c,-b,f,e,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//9
Dreieck(-d,c,-b,-a,0,-b,f,e,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//10
Dreieck(f,e,b,-a,0,-b,f,-e,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//11
Dreieck(-a,0,-b,-d,-c,-b,f,-e,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//12
Dreieck(f,-e,b,-d,-c,-b,d,-c,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//13
Dreieck(-d,-c,-b,-f,-e,-b,d,-c,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//14
Dreieck(d,-c,b,-f,-e,-b,a,0,b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//15
Dreieck(-f,e,-b,0,0,-1,-d,c,-b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//16
Dreieck(-d,c,-b,0,0,-1,-a,0,-b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//17
Dreieck(-a,0,-b,0,0,-1,-d,-c,-b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//18
Dreieck(-d,-c,-b,0,0,-1,-f,-e,-b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//19
Dreieck(-f,-e,-b,0,0,-1,-f,e,-b,A,iv,ii,it,ball_vertices[A],ball_indices[A],ball_texcoord[A]);//20
GLint gespart=0;
for (GLint test=0;test<ii;test++) {
for (GLint vergleich=0;vergleich<test;vergleich++) {
if (ball_vertices[A][3*ball_indices[A][test]+0]==ball_vertices[A][3*ball_indices[A][vergleich]+0] &&
ball_vertices[A][3*ball_indices[A][test]+1]==ball_vertices[A][3*ball_indices[A][vergleich]+1] &&
ball_vertices[A][3*ball_indices[A][test]+2]==ball_vertices[A][3*ball_indices[A][vergleich]+2]) {
if (ball_texcoord[A][2*ball_indices[A][test]+0]==ball_texcoord[A][2*ball_indices[A][vergleich]+0] &&
ball_texcoord[A][2*ball_indices[A][test]+1]==ball_texcoord[A][2*ball_indices[A][vergleich]+1]) {
ball_indices[A][test]=ball_indices[A][vergleich];
gespart++;
break;
} else {
/*
printf("%f %f\n%f %f\n%f %f\n%f %f\n%f %f\n\n",
ball_vertices[A][3*ball_indices[A][test]+0],ball_vertices[A][3*ball_indices[A][vergleich]+0],
ball_vertices[A][3*ball_indices[A][test]+1],ball_vertices[A][3*ball_indices[A][vergleich]+1],
ball_vertices[A][3*ball_indices[A][test]+2],ball_vertices[A][3*ball_indices[A][vergleich]+2],
ball_texcoord[A][2*ball_indices[A][test]+0],ball_texcoord[A][2*ball_indices[A][vergleich]+0],
ball_texcoord[A][2*ball_indices[A][test]+1],ball_texcoord[A][2*ball_indices[A][vergleich]+1]);
*/
}
}
}
}
//printf("gespart: %i\n",gespart);
}
}
}