60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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// validating the vertecies generated by tinker.ml are correct
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typedef struct VEC3 {
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float x;
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float y;
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float z;
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} VEC3;
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void print_vertecies(VEC3 v[], size_t s)
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{
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printf("[");
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for (int i = 0; i < s; i++)
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{
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printf("(%f, %f, %f)\n", v[i].x, v[i].y, v[i].z);
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}
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printf("]");
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}
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int main(void)
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{
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int stacks = 10;
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int slices = 12;
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float r = 0.175;
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// Generate sphere vectors
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VEC3 sphere_vertecies[stacks * slices];
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for (int i = 0; i < stacks; i++)
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{
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// Phi (angle of latitude, ranges from 0 to PI)
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float phi = M_PI * (float)i / (float)(stacks - 1);
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float sinPhi = sin(phi);
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float cosPhi = cos(phi);
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for (int j = 0; j < slices; j++)
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{
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// Theta (angle of longitude, ranges from 0 to 2*PI)
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float theta = 2.f * M_PI * (float)j / (float)slices;
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float sinTheta = sin(theta);
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float cosTheta = cos(theta);
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// Convert spherical coordinates to Cartesian (x, y, z)
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// The choice of axis mapping may vary. Here Y is vertical.
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sphere_vertecies[i * slices + j] = (VEC3){
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.x = r * cosTheta * sinPhi,
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.y = r * cosPhi,
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.z = r * sinTheta * sinPhi,
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};
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}
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}
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print_vertecies(sphere_vertecies, stacks * slices);
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return 0;
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}
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