class Model(object):
'''
A simple model class.
The model is loaded from Wavefront OBJ file.
'''
def __init__(self, filename, view):
self.model = OBJ_vbo(filename)
self.view = view
self.morient = Matrix4()
self.pivot = eVector3()
self.position = eVector3()
self.do_transformation_matrix()
def do_transformation_matrix(self):
if self.view.up.y == 1.:
# Obj's are exported with z axis up (0,0,1), so we need to
# rotate x for -90 degrees to align with view's y up axis (0,1,0)
self.orient.rotatex(pi / -2.)
'''
Apply transformations in following order (translation -> -pivot -> orientation -> pivot)
in order to rotate around arbitrary pivot point and properly position the model.
TODO: Optimize matrix concatenation (rewrite in compact form)
'''
self.mtransform = Matrix4.new_translate(*self.position) * Matrix4.new_translate(*(self.pivot * -1.)) * \
self.morient * Matrix4.new_translate(*self.pivot)
# Create ctype array of the matrix
self.m = (GLfloat * 16)(*self.mtransform)
def orient_from_direction(self, direction=None):
'''
If direction is None the orientation will be determined
from view's direction vector which means that model will
align with camera's direction.
'''
self.morient = self.view.get_parent2local(direction)
self.do_transformation_matrix()
def orient_from_axis_angle(self, angle, axis):
self.morient.identity()
self.morient.rotate_axis(angle, axis)
self.do_transformation_matrix()
def set_position(self, position):
self.position = eVector3(*position)
def set_pivot(self, pivot):
self.pivot = eVector3(*pivot)
def render(self):
glPushMatrix()
glMultMatrixf(self.m)
self.model.render()
glPopMatrix()
def __init__(self, filename, view):
self.model = OBJ_vbo(filename)
self.view = view
self.morient = Matrix4()
self.pivot = eVector3()
self.position = eVector3()
self.do_transformation_matrix()
