def calculate(self):
self.rays = []
cone_normal_top, cone_norma_bottom = self.light.cone_normals()
angle_top = math.atan2(cone_normal_top.y(), cone_norma_bottom.x())
angle_bottom = math.atan2(cone_norma_bottom.y(), cone_norma_bottom.x())
# get angle between vectors
total_angle = math.acos(
QVector2D.dotProduct(cone_normal_top, cone_norma_bottom))
part = total_angle / self.segments
for i in range(self.segments):
rad = math.atan2(self.light.dir.y(), self.light.dir.x())
angle_i = rad - total_angle / 2.0 + (part * i)
vector_i = QVector2D(math.cos(angle_i), math.sin(angle_i))
ray_i = Ray(self.light.get_focal_point_worldspace(), vector_i)
first_i = True
self.rays.append(ray_i)
for line in self.lines:
intersect_v = self.does_ray_intersect(ray_i, line)
if intersect_v:
length_i = (intersect_v - ray_i.pos).length()
if first_i:
ray_i.length = length_i
first_i = False
if length_i < ray_i.length:
ray_i.length = length_i
def _closest_point(self, line, point):
d = QVector2D(line.p2() - line.p1())
d.normalize()
v = QVector2D(point - line.p1())
return line.p1() + (d * QVector2D.dotProduct(d, v)).toPoint()
def reflect(self, point, normal):
v = point - (normal * QVector2D.dotProduct(point, normal) * 2)
v.normalize()
return v