Day 3!

.gitignore

@@ -1,2 +1,3 @@
 
 .DS_Store
+*.png

README.md

@@ -8,3 +8,4 @@ Hi! I'm [Alexandre Villares](https://abav.lugaralgum.com), let's see if I can ma
 
 002: [s180102](/s180102) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)] Many Stars 3D - [YouTube](https://www.youtube.com/watch?v=QmsthW60iBY)
 
+003: [s180103](/s180103) [[Py.Processing](https://villares.github.io/como-instalar-o-processing-modo-python/index-EN)] Tetrahedrons

s180103/s180103.pyde

@@ -0,0 +1,65 @@
+""" Tetrahedrons """
+
+T_LIST, ROT_X, ROT_Y = [], 0, 0
+Z_MIN, Z_MAX = -800, 0
+
+def setup():
+    size(800, 800, P3D)
+    for _ in range(100):
+        x, y, z = random(0, width), random(0, height), random(Z_MIN, Z_MAX)
+        T_LIST.append(Tetrahedron(x, y, z, 75))  # 75 is the size
+
+def draw():
+    global ROT_X, ROT_Y
+    ROT_X += 0.005
+    ROT_Y += 0.01
+    background(0)
+    strokeWeight(7)
+    for tetra in T_LIST:
+        # Draws only edges, or only faces if mousePressed
+        tetra.plot(ROT_X, ROT_Y, mousePressed)
+
+    # if frameCount < 100: saveFrame("t-##.png") # uncomment to save frames
+
+class Tetrahedron():
+
+    """ Tetrahedron """
+
+    def __init__(self, x, y, z, radius):
+        self.x, self.y, self.z = x, y, z
+        self.radius = radius
+        self.points = [PVector()] * 4
+        # calculate geometry
+        a = radius * 2 / 3.
+        self.points[0] = PVector(+a, +a, +a)  # vertex 1
+        self.points[1] = PVector(-a, -a, +a)  # vertex 2
+        self.points[2] = PVector(-a, +a, -a)  # vertex 3
+        self.points[3] = PVector(+a, -a, -a)  # vertex 4
+
+    # draws tetrahedron
+    def plot(self, rx=0, ry=0, showFaces=False):
+        c = color(map(self.x, 0, width, 255, 0),
+                  map(self.y, 0, height, 255, 0),
+                  map(self.z, Z_MIN, Z_MAX, 0, 255), 100)
+        if showFaces:
+            noStroke()
+            fill(c)
+        else:
+            noFill()
+            stroke(c)
+        with pushMatrix():
+            translate(self.x, self.y, self.z)
+            rotateX(ry)
+            rotateY(rx)
+            beginShape(TRIANGLE_STRIP)
+            p = self.points
+            vertex(p[0].x, p[0].y, p[0].z)  # vertex 1
+            vertex(p[1].x, p[1].y, p[1].z)  # vertex 2
+            vertex(p[2].x, p[2].y, p[2].z)  # vertex 3
+            vertex(p[3].x, p[3].y, p[3].z)  # vertex 4
+            vertex(p[0].x, p[0].y, p[0].z)  # vertex 1
+            vertex(p[1].x, p[1].y, p[1].z)  # vertex 2
+            vertex(p[3].x, p[3].y, p[3].z)  # vertex 4
+            vertex(p[2].x, p[2].y, p[2].z)  # vertex 3
+            vertex(p[1].x, p[1].y, p[1].z)  # vertex 2
+            endShape(CLOSE)

s180103/s180103_PeasyCam.pyde

@@ -0,0 +1,67 @@
+""" Tetrahedrons + PeasyCam"""
+
+add_library('peasycam')
+
+T_LIST, ROT_X, ROT_Y = [], 0, 0
+Z_MIN, Z_MAX = -800, 0
+
+def setup():
+    cam = PeasyCam(this, 100)
+    hint(DISABLE_DEPTH_TEST)
+    size(800, 800, P3D)
+    for _ in range(100):
+        x, y, z = random(0, width), random(0, height), random(Z_MIN, Z_MAX)
+        T_LIST.append(Tetrahedron(x, y, z, 75))  # 75 is the size
+
+def draw():
+    global ROT_X, ROT_Y
+    ROT_X += 0.005
+    ROT_Y += 0.01
+    background(0)
+    strokeWeight(7)
+    for tetra in T_LIST:
+        # Draws only edges, or only faces if a key is pressed
+        tetra.plot(ROT_X, ROT_Y, keyPressed)
+
+class Tetrahedron():
+
+    """ Tetrahedron """
+
+    def __init__(self, x, y, z, radius):
+        self.x, self.y, self.z = x, y, z
+        self.radius = radius
+        self.points = [PVector()] * 4
+        # calculate geometry
+        a = radius * 2 / 3.
+        self.points[0] = PVector(+a, +a, +a)  # vertex 1
+        self.points[1] = PVector(-a, -a, +a)  # vertex 2
+        self.points[2] = PVector(-a, +a, -a)  # vertex 3
+        self.points[3] = PVector(+a, -a, -a)  # vertex 4
+
+    # draws tetrahedron
+    def plot(self, rx=0, ry=0, showFaces=False):
+        c = color(map(self.x, 0, width, 255, 0),
+                  map(self.y, 0, height, 255, 0),
+                  map(self.z, Z_MIN, Z_MAX, 0, 255), 100)
+        if showFaces:
+            noStroke()
+            fill(c)
+        else:
+            noFill()
+            stroke(c)
+        with pushMatrix():
+            translate(self.x, self.y, self.z)
+            rotateX(ry)
+            rotateY(rx)
+            beginShape(TRIANGLE_STRIP)
+            p = self.points
+            vertex(p[0].x, p[0].y, p[0].z)  # vertex 1
+            vertex(p[1].x, p[1].y, p[1].z)  # vertex 2
+            vertex(p[2].x, p[2].y, p[2].z)  # vertex 3
+            vertex(p[3].x, p[3].y, p[3].z)  # vertex 4
+            vertex(p[0].x, p[0].y, p[0].z)  # vertex 1
+            vertex(p[1].x, p[1].y, p[1].z)  # vertex 2
+            vertex(p[3].x, p[3].y, p[3].z)  # vertex 4
+            vertex(p[2].x, p[2].y, p[2].z)  # vertex 3
+            vertex(p[1].x, p[1].y, p[1].z)  # vertex 2
+            endShape(CLOSE)

s180103/sketch.properties

@@ -0,0 +1,2 @@
+mode=Python
+mode.id=jycessing.mode.PythonMode