how to create ellipse inside 3d matrix? - c

Question

I have a AxBxC matrix filled with 0 and need to make an ellipse inside. The area that it covers needs to b filled with 1.
I have the code to create the 3d matrix, but don't know how to do the ellipse.
The user needs to give all the matrix dimensions and the ellipse dimensions as well.
#include <stdio.h>
#include <stdlib.h>
void criaMatriz() // Function to create 3d matrix
{
int ***m;
int x, y, z, i, j, k;
// Number of lines
printf("Digite o número de linhas:");
scanf("%d", &y);
// Number of columns
printf("Digite o número de colunas:");
scanf("%d", &z);
// depth
printf("Digite a largura do paralelepipedo:");
scanf("%d", &x);
m = malloc(x * sizeof(int **));
for (i = 0; i < x; i++)
{
m[i] = malloc(y * sizeof(int *));
}
for (i = 0; i < x; i++)
{
for (j = 0; j < y; j++)
{
m[i][j] = malloc(z * sizeof(int));
}
}
for (i = 0; i < x; i++)
{
for (j = 0; j < y; j++)
{
for (k = 0; k < z; k++)
{
m[i][j][k] = 0;
}
}
}
for (i = 0; i < x; i++)
{
for (j = 0; j < y; j++)
{
for (k = 0; k < z; k++)
{
printf("%2d ", m[i][j][k]);
}
printf("\n");
}
printf("\n");
}
for (i = 0; i < x; i++)
{
for (j = 0; j < y; j++)
{
free(m[i][j]);
}
}
for (i = 0; i < x; i++)
{
free(m[i]);
}
free(m);
}
int main()
{
criaMatriz();
return 0;
}
I tried making a sphere first, but it didn't work.