Implement mesh suport

Author: Bernardo de Oliveira Bruning

cmd/main.go

@@ -25,8 +25,8 @@ func run() {
 	img := image.NewRGBA(image.Rect(0, 0, int(win.Bounds().W()), int(win.Bounds().H())))
 
 	triangles := make([]render.Triangle, 100)
-	for i := 0; i < 1000; i++ {
-		triangle := render.NewRandTriangle(0, 800)
+	for i := 0; i < 3000; i++ {
+		triangle := render.NewRandTriangle(0, 20)
 		triangles = append(triangles, triangle)
 	}
 

render/mesh.go

@@ -15,30 +15,11 @@ func NewMesh(triangles []Triangle) Mesh {
 }
 
 func (m Mesh) Draw(dst draw.Image) {
-	zbuffer := make([][]bool, dst.Bounds().Dx())
-	for i := range zbuffer {
-		zbuffer[i] = make([]bool, dst.Bounds().Dy())
-	}
-
 	for _, triangle := range m.triangles {
 		r := uint8(rand.Intn(255))
 		g := uint8(rand.Intn(255))
 		b := uint8(rand.Intn(255))
 		color := color.RGBA{r, g, b, 0xff}
-		bound := triangle.Bounds()
-		for x := bound.Min.X; x < bound.Max.X; x++ {
-			for y := bound.Min.Y; y < bound.Max.Y; y++ {
-				if zbuffer[x][y] {
-					continue
-				}
-
-				point := Vector{X: float64(x), Y: float64(y)}
-				if triangle.Intersection(point) {
-					dst.Set(x, y, color)
-					zbuffer[x][y] = true
-				}
-			}
-		}
-		//triangle.Draw(dst, color.RGBA{R: r, G: g, B: b})
+		triangle.Draw(dst, color)
 	}
 }

render/triangle.go

@@ -25,10 +25,12 @@ func random(min, max float64) float64 {
 }
 
 func NewRandTriangle(min, max float64) Triangle {
+	x := random(0, 600)
+	y := random(0, 600)
 	return NewTriangle(
-		Vector{random(min, max), random(min, max), random(min, max)},
-		Vector{random(min, max), random(min, max), random(min, max)},
-		Vector{random(min, max), random(min, max), random(min, max)},
+		Vector{random(min, max), random(min, max), random(min, max)}.Add(NewVector(x, y, 0)),
+		Vector{random(min, max), random(min, max), random(min, max)}.Add(NewVector(x, y, 0)),
+		Vector{random(min, max), random(min, max), random(min, max)}.Add(NewVector(x, y, 0)),
 	)
 }