def move(self, delta_x, delta_y, buttons, modifiers):
# user is dragging
to = (self.at - self.eye)
distance = to.length()
if int(buttons) & Qt.LeftButton and not int(modifiers) & Qt.ShiftModifier:
right = QVector3D.crossProduct(to, self.up)
right = right.normalized()
up = QVector3D.crossProduct(right, to).normalized()
translation = right*(delta_x*distance)\
+ up*(delta_y*distance)
self.eye -= translation*5
# correct eye position to maintain distance
to = (self.at - self.eye)
self.eye = self.at - to.normalized()*distance
self.up = QVector3D.crossProduct(right, to).normalized()
elif int(buttons) & Qt.MiddleButton or (int(buttons) & Qt.LeftButton and int(modifiers) & Qt.ShiftModifier):
right = QVector3D.crossProduct(to, self.up).normalized()
up = QVector3D.crossProduct(right, to).normalized()
translation = right*(delta_x*distance)\
+ up*(delta_y*distance)
self.at -= translation
self.eye -= translation
elif int(buttons) & Qt.RightButton :
translation = to*delta_y
self.eye -= translation
def intersect (self, orig_v, dir_v, pl):
'''
method performing ray-triangle intersection (Moller-Trumbore algorithm)
@param orig QVector3D
@param dir QVector3D
@return isect_t float or None
'''
e1 = pl[1] - pl[0]
e2 = pl[2] - pl[0]
p = QVector3D.crossProduct (dir_v, e2)
p_dot_e1 = QVector3D.dotProduct (p, e1)
if p_dot_e1 == 0:
return None
inv_p_dot_e1 = 1.0 / p_dot_e1
t = orig_v - pl[0]
isect_u = inv_p_dot_e1 * QVector3D.dotProduct (p, t)
if isect_u<0 or isect_u>1:
return None
q = QVector3D.crossProduct (t, e1)
isect_v = inv_p_dot_e1 * QVector3D.dotProduct (q, dir_v)
if isect_v<0 or isect_u + isect_v>1:
return None
isect_t = inv_p_dot_e1 * QVector3D.dotProduct (e2, q)
return isect_t
def intersect(self, orig_v, dir_v, pl):
'''
method performing ray-triangle intersection (Moller-Trumbore algorithm)
@param orig QVector3D
@param dir QVector3D
@return isect_t float or None
'''
e1 = pl[1] - pl[0]
e2 = pl[2] - pl[0]
p = QVector3D.crossProduct(dir_v, e2)
p_dot_e1 = QVector3D.dotProduct(p, e1)
if p_dot_e1 == 0:
return None
inv_p_dot_e1 = 1.0 / p_dot_e1
t = orig_v - pl[0]
isect_u = inv_p_dot_e1 * QVector3D.dotProduct(p, t)
if isect_u < 0 or isect_u > 1:
return None
q = QVector3D.crossProduct(t, e1)
isect_v = inv_p_dot_e1 * QVector3D.dotProduct(q, dir_v)
if isect_v < 0 or isect_u + isect_v > 1:
return None
isect_t = inv_p_dot_e1 * QVector3D.dotProduct(e2, q)
return isect_t
