//////////////////////////////////////////////////////////////////////
// Create an image and write it out to a file
//////////////////////////////////////////////////////////////////////
int main()
{
int width = 400;
int height = 400;
VEC3F* image = new VEC3F[width * height]; // pixel values
VEC3F* ray[width * height]; // array of VEC3F pointers
int maxFrames = 1; // set to 30 to make 30 sequenced images
for(int v = 0; v < maxFrames; v++) {
int i = 0;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++, i++) {
ray[i] = generateRay(x, y, -0.5f, 0.5f, -0.5f, 0.5f, width, height, v); // generate Ray
image[i] = rayColor(ray[i]); // get RGB pixel color of ray intersecting on surface
}
}
//save sequence of images for movie
// std::stringstream stream;
// stream << "image" << v << ".ppm";
// std::string arraystring = stream.str();
// const char* filename = arraystring.c_str();
//writePPM(image, width, height, filename);
} // v for loop
writePPM(image, width, height, "image.ppm"); // comment this when saving movie
delete[] image;
return 0;
}
void drawScene (GLint nColorFilter)
{
// Declare data structures on stack to avoid malloc & free
point worldPix; // Current pixel in world coordinates
point direction; // direction.w will be set to 0 since it is a vector
ray r; // ray with start point worldPix and end vector direction
color c;
// z and w are constant for all pixels
worldPix.w = 1.0;
worldPix.z = pnear; // viewing plane is (x, y, z=1.0)
r.start = &worldPix;
r.end = &direction;
GLfloat imageWidth = 2 * pnear * tan(fovx / 2);
// Trace a ray for every pixel
for ( int i = 0; i < width; i++ )
{
for ( int j = 0; j < height; j++ )
{
// find position of pixel in world coordinates
// y position = (pixel height/middle) scaled to world coords
worldPix.y = (j - (height / 2))* imageWidth / width;
// x position = (pixel width/middle) scaled to world coords
worldPix.x = (i - (width / 2))* imageWidth / width;
// find direction
// note: direction vector is NOT NORMALIZED
calculateDirection(&viewpoint, &worldPix, &direction); // direction calculated here... direction.w <-- 0
// Find color for pixel
rayColor(r, &c, nColorFilter);
// write the pixel!
drawPixel(i, j, c.r, c.g, c.b);
}
}
}
