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# This is a CamiTK python action
#
# This action displaces the points of a MeshComponent randomly
# (this is the equivalent of the Shaker tutorial)
import camitk
import numpy as np
from PySide2.QtCore import QTimer
def tick(self:camitk.Action):
# get the point position as a numpy array
points = self.mesh.getPointSetAsNumpy();
percent = self.getParameterValue("Intensity")
# check dimensions
assert points.ndim == 2 and points.shape[1] == 3, "Input must be an (N, 3) array"
assert 0 <= percent <= 100, "Percent must be between 0 and 100"
# Compute bounding box
min_pt = points.min(axis=0)
max_pt = points.max(axis=0)
diag = np.linalg.norm(max_pt - min_pt)
move_distance = (percent / 100.0) * diag
# Generate random directions per point
random_vectors = np.random.randn(*points.shape)
norms = np.linalg.norm(random_vectors, axis=1, keepdims=True)
directions = random_vectors / norms # Normalize each row
# Scale and move
step_displacements = directions * move_distance
moved_points = points + step_displacements
# update mesh
self.mesh.replacePointSet(moved_points)
# compute displacements
if self.getParameterValue("Show Displacement"):
total_displacement = np.linalg.norm(moved_points - self.initial_position[self.mesh.getName()], axis=1)
self.mesh.addPointData("Displacement", total_displacement)
else:
self.mesh.setDataRepresentationOff()
# update interval
interval = self.getParameterValue("Update Intervals")
self.timer.setInterval(interval)
def init(self:camitk.Action):
self.timer = None
self.setApplyButtonText("Start Shaking")
self.initial_position = {}
def process(self:camitk.Action):
self.mesh = self.getTargets()[-1]
# store initial position
if self.mesh.getName() not in self.initial_position:
self.initial_position[self.mesh.getName()] = self.mesh.getPointSetAsNumpy();
if not self.timer:
self.timer = QTimer()
connected = self.timer.timeout.connect(lambda: tick(self))
if not self.timer.isActive():
self.setApplyButtonText("Stop Shaking")
interval = self.getParameterValue("Update Intervals")
self.timer.start(interval)
else:
self.mesh.replacePointSet(self.initial_position[self.mesh.getName()])
self.setApplyButtonText("Restart Shaking")
self.timer.stop()
def parameterChanged(self:camitk.Action, name:str):
if not self.getParameterValue("Show Displacement"):
self.mesh.setDataRepresentationOff()
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