/*======== double calculate_dot() ==========
Inputs: struct matrix *points
int i
Returns: The dot product of a surface normal and
a view vector
calculates the dot product of the surface normal to
triangle points[i], points[i+1], points[i+2] and a
view vector (use <0, 0, -1> to start.
04/17/12 16:38:34
jonalf
====================*/
double calculate_dot( struct matrix *points, int i ) {
vector normal;
vector view;
double dot;
calculate_surface_normal(points, i, normal);
//set up view vector
view[X] = 0;
view[Y] = 0;
view[Z] = -1;
//calculate dot product
dot = dot_product(normal, view);
return dot;
}
color calculate_I(struct matrix *polygons, screen s, color c, int i){
color Ia, Id, Is;
int li;
calculate_surface_normal(polygons, i);
for(li=0; li<=light_index; li++){
normalize_light(polygons, i, li);
}
Ia = calculate_Ia();
Id = calculate_Id(polygons, s, c, i);
Is = calculate_Is(polygons, s, c, i);
//printf("Ia: r:%d, g:%d, b:%d\n",Ia.red,Ia.green,Ia.blue);
//printf("Id: r:%d, g:%d, b:%d\n",Id.red,Id.green,Id.blue);
//printf("Is: r:%d, g:%d, b:%d\n\n",Is.red,Is.green,Is.blue);
c.red = Ia.red + Id.red + Is.red;
c.green = Ia.green + Id.green + Is.green;
c.blue = Ia.blue + Id.blue + Is.blue;
return c;
}
