def tumble(self, hdelta, vdelta):
"""
This is equivalent of rotating the camera around it's target point while maintaining the direction vector; to reflect the change in view the camera will be rotated by the additive inverse of the deltas.
@param hdelta The horizontal delta (the up vector rotation)
@param vdelta The vertical delta (the right vector rotation)
@see Maya Rotation defintions (http://download.autodesk.com/global/docs/maya2013/en_us/index.html?url=files/Viewing_the_scene_Tumble_track_dolly_or_tilt_the_view.htm,topicNumber=d30e15213)
@see Rotation algorithm (http://gamedev.stackexchange.com/questions/20758/how-can-i-orbit-a-camera-about-its-target-point)
"""
# Get the current look at vector (e.g inverse direction)
idirection = self._position - self._target
# Rotate the y-axis (aka 'up' vector) which is the plane normal coming out of the x-z plane.
# The x-z plane is typically the horizontal plane and the yaw angle is measured by the horizontal delta parameter.
hrotation = - hdelta * self._pixelradians
M = Matrix4x4.rotation( hrotation, self.__camera_upvector__ )
idirection = M * idirection
self._up = M * self._up
right = (self._up ^ idirection).normalized()
# Now rotate the x-axis (aka 'right' vector) which is the plane normal coming out of the y-z plane.
# The y-z plane is typically the vertical plane and the pitch angle is measured by the vertical delta parameter.
vrotation = - vdelta * self._pixelradians
M = Matrix4x4.rotation( vrotation, right )
idirection = M * idirection
self._up = M * self._up
# Update the camera's position
self._position = self._target + idirection
self._updateProjectionMatrix()
def _generateMatrix(self):
"""
Generates a transformation matrix from internal data.
@returns A Matrix4x4 representation of the transformation component.
"""
radians = math.radians(self.angle)
return Matrix4x4.rotation(radians, self.__axis, self.__point)
def _generateMatrix(self):
"""
Generates a transformation matrix from internal data.
@returns A Matrix4x4 representation of the transformation component.
"""
radians = math.radians(self.angle)
return Matrix4x4.rotation(radians, self.__axis, self.__point)
def paint_enter(self):
"""
Implements the GLNodeAdapter's paint_enter method for an OpenGL Render operation.
"""
GL.glPushAttrib(GL.GL_ENABLE_BIT | GL.GL_DEPTH_BUFFER_BIT | GL.GL_LINE_BIT | GL.GL_CURRENT_BIT)
GL.glPushClientAttrib(GL.GL_CLIENT_VERTEX_ARRAY_BIT)
GL.glMatrixMode(GL.GL_MODELVIEW)
GL.glPushMatrix()
GL.glMultMatrixf(self._node.matrix().data())
GL.glColor(self._node.color.getRgbF())
# The positive Z-axis is the default direction for Cylinder Quadrics in OpenGL.
# If our vector is not parallel to the z-axis, e.g. (0, 0, Z), then rotate it.
# 1) Get a normal from the z-v plane
# 2) Get the angle inbetween z-v on the plane (see vector dot product)
# 3) Rotate the normal by that angle.
v = self._node.axis
m = Matrix4x4.identity()
if v.x != 0 or v.y != 0:
zaxis = Vector3D(0,0,1)
angle = zaxis.angle(v)
normal = zaxis.crossproduct(v, True)
m *= Matrix4x4.rotation(angle, normal)
# The positive Z-axis is the default direction fo Cylinder Quadrics in OpenGL.
# If our z is negative, we need to flip the cylinder
if v.z < 0:
yaxis = Vector3D(1,0,0)
m *= Matrix4x4.rotation(math.radians(180), yaxis)
GL.glMultMatrixf(m.data())
q = self.__quadric
r = self._node.radius
h = self._node.length
sl = self._node.slices
st = self._node.stacks
lp = self._node.loops
GLU.gluQuadricDrawStyle (q, GLU.GLU_FILL)
GLU.gluQuadricNormals (q, GLU.GLU_SMOOTH)
GLU.gluQuadricOrientation(q, GLU.GLU_OUTSIDE)
self._glcylinder(q, r, h, sl, st, lp)
def roll(self, delta):
"""
Executes a rotation operation around the z-axis
This is equivalent of rotating the camera around it's z-axis; to reflect the change in view the camera will be rotated by the additive inverse of the delta.
@param delta The rotation delta (the change in rotating around the direction vector)
"""
# Get the current look at vector (e.g inverse direction)
direction = self._target - self._position
# Rotate the z-axis (aka 'look at' vector) which is the plane normal coming out of the x-y plane.
# Since we're rotating the x-y plane, the concept of vertical or horizontal delta doesn't apply; it's
# a straight up spin of the look at vector
rotation = - delta * self._pixelradians
M = Matrix4x4.rotation( rotation, direction )
self._up = M * self._up
self._updateProjectionMatrix()