Camera struct
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93ff66ada9
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1 changed files with 81 additions and 57 deletions
138
main.go
138
main.go
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@ -277,75 +277,99 @@ func (hl Hittable) Hit(r *Ray, ray_t Interval, rec *Hit_record) bool {
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return hit_anything
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}
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func Ray_color(r Ray, world *Hittable) Vec3 {
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// =============== CAMERA ===================
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type Camera struct {
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aspect_ratio float32
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image_width int
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image_height int
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center Vec3
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pixel00_loc Vec3
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pixel_delta_u Vec3
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pixel_delta_v Vec3
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}
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func NewCamera() *Camera {
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return &Camera{}
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}
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func Ray_color(r Ray, world *Hittable) Vec3 {
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var rec Hit_record
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if (world.Hit(&r, *NewInterval(0, float32(math.Inf(1))), &rec)) {
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return rec.normal.Add(NewColor(1,1,1)).Mult(0.5)
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}
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unit_direction := Unit_vector(r.Direction())
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a := (unit_direction.Y() + 1.0)*0.5
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return NewColor(1.0,1.0,1.0).Mult(float32(1.0-a)).Add(NewColor(0.5,0.7,1.0).Mult(a))
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}
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func (cam *Camera) Initialize() {
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// Calculate the image height
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cam.image_height = int(float32(cam.image_width) / cam.aspect_ratio)
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if cam.image_height < 1 {
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cam.image_height = 1
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}
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// Viewport
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var focal_length float32 = 1.0
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var viewport_height float32 = 2.0
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var viewport_width float32 = viewport_height * float32(cam.image_width)/float32(cam.image_height)
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cam.center = NewVec3(0,0,0)
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// Calculate the vectors across the horizontal and down the vertical viewport edges
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viewport_u := NewVec3(viewport_width, 0, 0)
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viewport_v := NewVec3(0, -viewport_height, 0)
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//Calculate the horizontal and vertical delta vectors from pixel to pixel
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cam.pixel_delta_u = viewport_u.Div(float32(cam.image_width))
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cam.pixel_delta_v = viewport_v.Div(float32(cam.image_height))
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// Calculate the location of the upper left pixel
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viewport_upper_left := cam.center.Sub(cam.center).Sub(NewVec3(0, 0, focal_length)).Sub(viewport_u.Div(2)).Sub(viewport_v.Div(2))
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cam.pixel00_loc = viewport_upper_left.Add((cam.pixel_delta_u.Add(cam.pixel_delta_v)).Div(2))
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}
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func (cam *Camera) Render(world *Hittable) {
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cam.Initialize()
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// Rendering
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fmt.Println("P3")
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fmt.Println(cam.image_width, " ", cam.image_height, "\n255")
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for j := 0; j < cam.image_height; j++ {
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fmt.Fprintf(os.Stderr, "\rScanlines remaining: %d ", cam.image_height-j)
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for i := 0; i < cam.image_width; i++ {
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pixel_center := cam.pixel00_loc.Add(cam.pixel_delta_u.Mult(float32(i))).Add(cam.pixel_delta_v.Mult(float32(j)))
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ray_direction := pixel_center.Sub(cam.center)
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r := NewRay(cam.center, ray_direction)
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pixel_color := Ray_color(*r, world)
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Write_color(pixel_color)
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}
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}
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}
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// =============== MAIN =====================
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func main() {
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// World
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// Image
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aspect_ratio := 16.0 / 9.0;
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var image_width int = 400;
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world := NewHittable()
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world.Add(Sphere{
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center: NewVec3(0, 0, -1),
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radius: 0.5,
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})
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world.Add(Sphere{
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center: NewVec3(0, -100.5, -1),
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radius: 100,
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})
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// Image
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// Calculate the image height
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var image_height int = int(float64(image_width) / aspect_ratio)
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if image_height < 1 {
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image_height = 1
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}
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// World
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world := NewHittable()
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world.Add(Sphere{
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center: NewVec3(0, 0, -1),
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radius: 0.5,
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})
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world.Add(Sphere{
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center: NewVec3(0, -100.5, -1),
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radius: 100,
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})
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cam := NewCamera()
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cam.aspect_ratio = 16.0 / 9.0
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cam.image_width = 400
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// Camera
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var focal_length float32 = 1.0
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var viewport_height float32 = 2.0
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var viewport_width float32 = viewport_height * float32(image_width)/float32(image_height)
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camera_center := NewVec3(0,0,0)
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// Calculate the vectors across the horizontal and down the vertical viewport edges
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viewport_u := NewVec3(viewport_width, 0, 0)
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viewport_v := NewVec3(0, -viewport_height, 0)
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//Calculate the horizontal and vertical delta vectors from pixel to pixel
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pixel_delta_u := viewport_u.Div(float32(image_width))
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pixel_delta_v := viewport_v.Div(float32(image_height))
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// Calculate the location of the upper left pixel
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viewport_upper_left := camera_center.Sub(camera_center).Sub(NewVec3(0, 0, focal_length)).Sub(viewport_u.Div(2)).Sub(viewport_v.Div(2))
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pixel00_loc := viewport_upper_left.Add((pixel_delta_u.Add(pixel_delta_v)).Div(2))
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// Rendering
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fmt.Println("P3")
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fmt.Println(image_width, " ", image_height, "\n255")
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for j := 0; j < image_height; j++ {
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fmt.Fprintf(os.Stderr, "\rScanlines remaining: %d ", image_height-j)
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for i := 0; i < image_width; i++ {
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pixel_center := pixel00_loc.Add(pixel_delta_u.Mult(float32(i))).Add(pixel_delta_v.Mult(float32(j)))
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ray_direction := pixel_center.Sub(camera_center)
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r := NewRay(camera_center, ray_direction)
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pixel_color := Ray_color(*r, world)
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Write_color(pixel_color)
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}
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}
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// INFO: The pixels are written out in rows.
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// Image file can be created with
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// go run main.go > image.ppm
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cam.Render(world)
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// INFO: The pixels are written out in rows.
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// Image file can be created with
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// go run main.go > image.ppm
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}
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