public void computeImage(double time) {
initFrame(time);
// initial each pixar pz depth
for (int i = 0; i < W * H; i++) {
pz_pix[i] = 0;
}
// initialize each pixar color to background color
for (int i = 0; i < H * W; i++)
pix[i] =
pack(
(int) (background[0] * 255),
(int) (background[1] * 255),
(int) (background[2] * 255));
// for each shapes
for (int i = 0; i < geoI; i++) {
double vertex[][] = t[i].vertices;
double normal[][] = t[i].normals;
int face[][] = t[i].faces;
// calculate rgb color for each vertice
for (int j = 0; j < vertex.length; j++) {
normalize(normal[j]);
double I[] = {vertex[i][0] - viewX, vertex[i][1] - viewY, vertex[i][2] - viewZ};
normalize(I);
double dotP = dot(normal[j], I);
double R[] = {
I[0] - 2.0 * dotP * normal[j][0],
I[1] - 2.0 * dotP * normal[j][1],
I[2] - 2.0 * dotP * normal[j][2]
};
normalize(R);
double p = materials[i].p;
t[i].colors[j][0] = materials[i].Argb[0];
t[i].colors[j][1] = materials[i].Argb[1];
t[i].colors[j][2] = materials[i].Argb[2];
// for each light!
for (int iL = 0; iL < lights.length; iL++) {
double dotLN = Math.max(0, dot(lights[iL].Lxyz, normal[j]));
double dotLV = Math.pow(Math.max(0, dot(lights[iL].Lxyz, R)), p);
t[i].colors[j][0] +=
lights[iL].Irgb[0] * (materials[i].Drgb[0] * dotLN + materials[i].Srgb[0] * dotLV);
t[i].colors[j][1] +=
lights[iL].Irgb[1] * (materials[i].Drgb[1] * dotLN + materials[i].Srgb[1] * dotLV);
t[i].colors[j][2] +=
lights[iL].Irgb[2] * (materials[i].Drgb[2] * dotLN + materials[i].Srgb[2] * dotLV);
}
}
for (int j = 0; j < face.length; j++) {
// first half => triangle
draw.set1vertex(vertex[face[j][0]][0], vertex[face[j][0]][1], vertex[face[j][0]][2]);
draw.set2vertex(vertex[face[j][1]][0], vertex[face[j][1]][1], vertex[face[j][1]][2]);
draw.set3vertex(vertex[face[j][2]][0], vertex[face[j][2]][1], vertex[face[j][2]][2]);
draw.set1rgb(
t[i].colors[face[j][0]][0], t[i].colors[face[j][0]][1], t[i].colors[face[j][0]][2]);
draw.set2rgb(
t[i].colors[face[j][1]][0], t[i].colors[face[j][1]][1], t[i].colors[face[j][1]][2]);
draw.set3rgb(
t[i].colors[face[j][2]][0], t[i].colors[face[j][2]][1], t[i].colors[face[j][2]][2]);
perspective(draw);
draw.toTrapezoids();
interpTri(draw);
// second half => triangle
draw.set1vertex(vertex[face[j][0]][0], vertex[face[j][0]][1], vertex[face[j][0]][2]);
draw.set2vertex(vertex[face[j][2]][0], vertex[face[j][2]][1], vertex[face[j][2]][2]);
draw.set3vertex(vertex[face[j][3]][0], vertex[face[j][3]][1], vertex[face[j][3]][2]);
draw.set1rgb(
t[i].colors[face[j][0]][0], t[i].colors[face[j][0]][1], t[i].colors[face[j][0]][2]);
draw.set2rgb(
t[i].colors[face[j][2]][0], t[i].colors[face[j][2]][1], t[i].colors[face[j][2]][2]);
draw.set3rgb(
t[i].colors[face[j][3]][0], t[i].colors[face[j][3]][1], t[i].colors[face[j][3]][2]);
perspective(draw);
draw.toTrapezoids();
interpTri(draw);
}
}
}
