35 lines
914 B
C
35 lines
914 B
C
//
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// Created by ary on 29.07.2026.
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//
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#include "helper.h"
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#include <stdlib.h>
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#include <math.h>
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#include "structs.h"
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#include "vectorOp.h"
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#define EPSILON 1e-8
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vec3 randUnitVector() {
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double x1,x2,lengthSquared;
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do {
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x1 = (rand() / (double) RAND_MAX) * 2 - 1; //random zahl zwischen -1 und 1
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x2 = (rand() / (double) RAND_MAX) * 2 - 1;
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lengthSquared = x1 * x1 + x2 * x2;
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}while (lengthSquared >= 1);
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double weirdFactor = 2.0 * sqrt(1.0 - lengthSquared);
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return (vec3){
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x1 * weirdFactor,
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x2 * weirdFactor,
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1.0 - 2.0 * lengthSquared};
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}
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int epsilonCheck(vec3 p1, vec3 p2) { //if distance is to small, the test fails (return 0)
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vec3 distanceVector = vec3Subtract(p1, p2);
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double sumVector = fabs(distanceVector.x) + fabs(distanceVector.y) + fabs(distanceVector.z);
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if (sumVector <= EPSILON) {
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return 0;
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}
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return 1;
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}
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