def intersectSphere(origin, ray, sphere):
center = np.array(sphere["center"])
radius = float(sphere["radius"])
closestIntersect = Intersection.worstCase()
a = np.dot(ray, ray)
b = np.dot(2*ray, (origin - center))
c = np.dot((origin - center), (origin - center)) - (radius * radius)
delta = b*b - 4*a*c
if(delta > 0):
t1 = (-b - math.sqrt(delta)) / (2*a)
t2 = (-b + math.sqrt(delta)) / (2*a)
ti = min(t1, t2)
if(ti > 0):
pi = origin + ray*ti
n = (pi - center)
n /= np.linalg.norm(n)
return Intersection(ti, n, pi, sphere)
return None
def intersectCube(origin, ray, cube):
minBound = np.array(cube["min"])
maxBound = np.array(cube["max"])
closestIntersect = Intersection.worstCase()
# Front side
p1 = np.array([minBound[0], minBound[1], minBound[2]])
p2 = np.array([maxBound[0], minBound[1], minBound[2]])
p3 = np.array([maxBound[0], maxBound[1], minBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
p1 = np.array([minBound[0], minBound[1], minBound[2]])
p2 = np.array([maxBound[0], maxBound[1], minBound[2]])
p3 = np.array([minBound[0], maxBound[1], minBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
# Back side
p1 = np.array([minBound[0], minBound[1], maxBound[2]])
p2 = np.array([minBound[0], maxBound[1], maxBound[2]])
p3 = np.array([maxBound[0], maxBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
p1 = np.array([minBound[0], minBound[1], maxBound[2]])
p2 = np.array([minBound[0], maxBound[1], maxBound[2]])
p3 = np.array([maxBound[0], maxBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
# Right side
p1 = np.array([maxBound[0], minBound[1], minBound[2]])
p2 = np.array([maxBound[0], maxBound[1], minBound[2]])
p3 = np.array([maxBound[0], maxBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
p1 = np.array([maxBound[0], minBound[1], minBound[2]])
p2 = np.array([maxBound[0], maxBound[1], maxBound[2]])
p3 = np.array([maxBound[0], minBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
# Left side
p1 = np.array([minBound[0], minBound[1], minBound[2]])
p2 = np.array([minBound[0], maxBound[1], minBound[2]])
p3 = np.array([minBound[0], maxBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
p1 = np.array([minBound[0], minBound[1], minBound[2]])
p2 = np.array([minBound[0], maxBound[1], maxBound[2]])
p3 = np.array([minBound[0], maxBound[1], minBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
# Up side
p1 = np.array([minBound[0], maxBound[1], minBound[2]])
p2 = np.array([maxBound[0], maxBound[1], maxBound[2]])
p3 = np.array([maxBound[0], maxBound[1], minBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
p1 = np.array([minBound[0], maxBound[1], minBound[2]])
p2 = np.array([minBound[0], maxBound[1], maxBound[2]])
p3 = np.array([maxBound[0], maxBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
# Down side
p1 = np.array([minBound[0], minBound[1], minBound[2]])
p2 = np.array([maxBound[0], minBound[1], minBound[2]])
p3 = np.array([maxBound[0], minBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
p1 = np.array([minBound[0], minBound[1], minBound[2]])
p2 = np.array([maxBound[0], minBound[1], maxBound[2]])
p3 = np.array([minBound[0], minBound[1], maxBound[2]])
intersection = intersectTriangle(p1, p2, p3, origin, ray)
if(intersection != None and intersection < closestIntersect):
intersection.obj = cube
closestIntersect = intersection
if(closestIntersect.distance < 1000):
return closestIntersect
return None
