Post by grumpyrobot on Jan 16, 2021 22:59:02 GMT
Implementing the raytracer in C as a school project.
The project requires the camera settings to be input through a text file, which is parsed and used by the program. The camera receives parameters for it's position in space as X Y Z coordinates, camera orientation as normalized vector coordinates, and field of vision as a double.
When the camera orientation values are 0, X, 0 i.e. only defining orientation on the Y axis, the true_up value in the view_transform function ends up being zero, which leads the camera transformation matrix to be a singular matrix i.e. a matrix that cannot be inverted. As the program relies on inverting matrixes to be able to cast rays, it ends up crashing. My question is, what should I do with this case of having a value that results in a singular matrix with a determinant of zero?
My invert_matrix function:
My view_transform function:
t_matrix invert_matrix(t_matrix mat)
{
t_matrix new;
t_matrix transp;
double det;
size_t i;
size_t j;
new = create_matrix(mat.row, mat.col);
det = det_4x4(mat);
i = 0;
while (i < mat.row)
{
j = 0;
while (j < mat.col)
{
new.matrix[i][j] = cofactor_4x4(mat, i, j);
j++;
}
i++;
}
transp = transpose_matrix(new);
free_matrix(new);
new = scalar_matrix(transp, 1 / det);
free_matrix(transp);
return (new);
}My view_transform function:
t_matrix view_transform(t_tuple from, t_tuple to, t_tuple up)
{
t_tuple forward;
t_tuple up_normal;
t_tuple left;
t_tuple true_up;
forward = normalize_v(subtract_tuple(to, from));
up_normal = normalize_v(up);
left = cross_product(forward, up_normal);
true_up = cross_product(left, forward);
return (calculate_orientation(left, true_up, forward, from));
}Thanks!